From owner-audiology@net.bio.net Fri Sep 01 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.uoregon.edu!news.dacom.co.kr!news.netins.net!usenet From: HearWHAC@netins.net (HearWHAC) Newsgroups: bionet.audiology Subject: Re: personality type, MBTI Date: 2 Sep 1995 15:11:15 GMT Organization: INS Info Services, Des Moines, IA, USA Lines: 58 Message-ID: <429s6j$jfg@insosf1.netins.net> References: NNTP-Posting-Host: s3135.netins.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 In article , rpluta@crl.com says... > >Hi! > >I've heard of some 'research' about the Myers Briggs Type Indicator and >how audiologists tend to score. Does anyone know where this info might be? >We certainly know how the speech paths would score! > Hi Rob: This subject is very interesting to me. In 1988 we started using MBTI in our practice for "team building" and we have had zero employee turnover since! It works! Two of us in our office are certified to administer the MBTI and I am currently President of the Central Iowa Chapter of the Association for Psychological Type ("the" MBTI organization). My theory of management is "It Takes All Types!" Too many managers make the mistake of surrounding themselves with "clones," i.e. persons like themselves. I am an old-time "traditional" hearing aid dealer with three very successful audiologists on my staff. The four of us who dispense hearing aids are about as opposite in MBTI terms that you can get. If we were a square, each of us would be in a different corner. I am the ESTJ leader. The audiologists are an ENTJ, also a leader but much more independent so we let him manage four of our offices and like most NTs, he is the "techie;" an INFP who is the visionary one with great feeling, she makes a great contribution but she is very proud to be "different;" and an ISFP who is a lot of fun and our problem solver. We are a closely bonded group and work very well together. The ESTJ and INFP are MBTI complements and the ENTJ and ISFP are also complements. We have each of the four temperaments represented, SJ, NT, NF and SP. It is an interesting team. I do not use MBTI in the hiring process because I do not trust it. It was a complete accident that the four of us came together. Apparently these four MBTI "types" can successfully dispense hearing aids - the four of us always seem to dispense about the same number of hearing aids each year and we each earn about the same income (we are paid strictly a percentage of the professional fees we bring in - no base salaries). We just do it in completely different ways! Thank you for bringing up this very interesting thread. I hope it continues. I understand Oticon is doing some very interesting things in this area. I have read two papers that have been published. They apparently have eliminted job titles, they have portable desks and they can change things very quickly. I'm not sure how well it will work, but it is a very interesting thing they are doing in Denmark. Please keep me informed of any research you run into on this subject. What type do you think is most common among Speech Paths? I know of two ISTJ Speech Paths, but I would doubt if that is the MBTI type you have in mind. Thanks again. Paul Woodard Des Moines IA From owner-audiology@net.bio.net Fri Sep 01 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!NewsWatcher!user From: rpluta@crl.com (Robert Pluta) Newsgroups: bionet.audiology Subject: Re: personality type, MBTI Date: Sat, 02 Sep 1995 13:51:47 -0600 Organization: Hodie Nickels Inc. Lines: 22 Message-ID: References: <429s6j$jfg@insosf1.netins.net> NNTP-Posting-Host: crl2.crl.com In article <429s6j$jfg@insosf1.netins.net>, HearWHAC@netins.net (HearWHAC) wrote: > > Please keep me informed of any research you run into on this subject. > > What type do you think is most common among Speech Paths? I know of two ISTJ > Speech Paths, but I would doubt if that is the MBTI type you have in mind. Thanks, Paul for you post! I'll keep a lookout for some MBTI stuff and post it when I can. IMHO, the most common type for SLPs is ISFJ (same as nurses). bfn, rob -- ------------------------***-----------***-----------***-------------- Rob Pluta "The truth is the light, the light is the way, 5380 Medical #405 the less folks know, the more they have to say." San Antonio TX 78240 --The Remains, c.1966 From owner-audiology@net.bio.net Fri Sep 01 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!tank.news.pipex.net!pipex!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: bjparker@aol.com (BJPARKER) Newsgroups: bionet.audiology Subject: Re: personality type, MBTI Date: 2 Sep 1995 15:47:01 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <42acbl$677@newsbf02.news.aol.com> References: <429s6j$jfg@insosf1.netins.net> Reply-To: bjparker@aol.com (BJPARKER) NNTP-Posting-Host: newsbf02.mail.aol.com The speech & hearing center where I work uses a similar scale to the MBTI for the management level positions. It was made a part of the hiring process which think may have been a mistake. It seemed, in some cases, to set-up communication styles before people really got to know each other. While I think the scale was fairly accurate in personality traits it hardly describes a whole person. I think we need to be very careful in how we use and interpret any personality scale. We also use a Total Quality Management (TQM) approach as you described Oticon is trying. We have had varying success depending on the situation. Does anyone else work in a facility committed to TQM or similar programs? If so, how is it working? Since Audiologists tend to be independent thinkers do you see differences between speech and hearing employees? From owner-audiology@net.bio.net Sat Sep 02 23:00:00 1995 Path: biosci!agate!dog.ee.lbl.gov!news.cs.utah.edu!news.cc.utah.edu!news From: Loren.Randolph@m.cc.utah.edu (Loren Randolph) Newsgroups: bionet.audiology Subject: Re: Cochlear Implant Evaluation -- Promontory Stimulation Test Date: Sat, 02 Sep 1995 01:50:28 GMT Organization: University of Utah Computer Center Lines: 20 Message-ID: <428d94$opq@news.cc.utah.edu> References: <427r5c$cmr@hollywood.cinenet.net> NNTP-Posting-Host: cts27.cc.utah.edu X-Newsreader: Forte Free Agent 1.0.82 The following info is based on about 80 stims: 1. Poking sensation is probably from promontory electrode in wrong place, stimulating 7 or 10 cranial nerves. Need to reposition electrode during testing until proper (acoustic) perception attained. 2.. Short term, adaptation probably not significant, but we have noticed that thresholds tend to rise with time. (Longest implant pt here, with Symbion-Richards-Cochlear Corp implant = 12 years) 3. lack of ucl could relate to safeguards in stimulator, of lack of ucl in pt. I wouldn't get real excited about it, as long as pt can perceive increase in loudness with increase in amplitude 4. Balance problem likely related to local anesthetic. We initially thought that auditory (electrical) stim could cause stim of only one side of vestibular system, thus vertigo, but it has never happened. We do, however, keep a large trash can handy during the prom test because of the anesthetic, and insist that the patient bring a driver. If you have further questions, please feel free to call at 1-801-581-8915 Loren From owner-audiology@net.bio.net Sat Sep 02 23:00:00 1995 Path: biosci!agate!howland.reston.ans.net!usc!sdd.hp.com!news1.best.com!news3.net99.net!news.cais.net!news.cinenet.net!not-for-mail From: erc@cinenet.net (Eric Smith) Newsgroups: bionet.audiology Subject: Re: Cochlear Implant Evaluation -- Promontory Stimulation Test Date: 2 Sep 1995 23:39:33 -0700 Organization: Cinenet Communications, Internet Access, Santa Monica, USA Lines: 48 Message-ID: <42bij5$ibm@hollywood.cinenet.net> References: <427r5c$cmr@hollywood.cinenet.net> <428d94$opq@news.cc.utah.edu> NNTP-Posting-Host: hollywood.cinenet.net In article <428d94$opq@news.cc.utah.edu>, Loren Randolph wrote: >The following info is based on about 80 stims: >1. Poking sensation is probably from promontory electrode in wrong >place, stimulating 7 or 10 cranial nerves. Need to reposition >electrode during testing until proper (acoustic) perception attained. According to the audiologist who operates the prom stim equipment, the equipment has an indicator on it to tell when the electrode is in the right place. But the poking sensation happened regardless, and at the same time sound was perceived. >2.. Short term, adaptation probably not significant, but we have >noticed that thresholds tend to rise with time. (Longest implant pt >here, with Symbion-Richards-Cochlear Corp implant = 12 years) Do you mean the thresholds rise with time in those patients who had the adaptation, but not in other patients? Can you give an example, in dB per year, or some such figures, of the threshold rise for a specific patient, to make it clearer how much of a factor it is? I have been told that the adaptation is something the prom stim test is looking for, and that it might be a contraindicator for a CI. >3. lack of ucl could relate to safeguards in stimulator, of lack of >ucl in pt. I wouldn't get real excited about it, as long as pt can >perceive increase in loudness with increase in amplitude Have you observed specific cases of lack of ucl? How common does it seem to be? >4. Balance problem likely related to local anesthetic. We initially >thought that auditory (electrical) stim could cause stim of only one >side of vestibular system, thus vertigo, but it has never happened. >We do, however, keep a large trash can handy during the prom test >because of the anesthetic, and insist that the patient bring a driver. Excellent idea. Better than sending the patient to the emergency room when it happens. :-) From owner-audiology@net.bio.net Sat Sep 02 23:00:00 1995 Path: biosci!agate!dog.ee.lbl.gov!news.cs.utah.edu!news.cc.utah.edu!news From: Loren.Randolph@m.cc.utah.edu (Loren Randolph) Newsgroups: bionet.audiology Subject: Re: Cochlear Implant Evaluation -- Promontory Stimulation Test Date: Sun, 03 Sep 1995 21:26:30 GMT Organization: University of Utah Computer Center Lines: 18 Message-ID: <42d6i6$6io@news.cc.utah.edu> References: <427r5c$cmr@hollywood.cinenet.net> <428d94$opq@news.cc.utah.edu> <42bij5$ibm@hollywood.cinenet.net> NNTP-Posting-Host: cts45.cc.utah.edu X-Newsreader: Forte Free Agent 1.0.82 in answer to your questions: 1. see original response # 1 My monitor in front of me has a little green light that tells me when it is on, but I still look at the screen to make sure all is really ok. Try repositioning the probe. 2. Yup, I am here equating adaption with threshold change over time. It has happened in many patients, but not all. Here also I speak of electrical threshold, which does not always relate to soundfield threshold change. We have not found any special pattern, which makes it more intriguing. We have never really looked for adaptation during the prom tests, so can't relate it to long-term stuff. 3. Lack of ucl is very common in our pts, but please note that we have deliberately limited equipment output at 200 ua. We have a way of getting around that, as described in a phD dissertation by M. Korine Dankowski (search Medline on that, I also have some stuff out there), but prefer not to see our pts hair start to smoke. Loren From owner-audiology@net.bio.net Mon Sep 04 23:00:00 1995 Path: biosci!IX.NETCOM.COM!earaid From: earaid@IX.NETCOM.COM (Paula Castanon) Newsgroups: bionet.audiology Subject: subscribe Date: 4 Sep 1995 19:50:50 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 5 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509050245.TAA06893@ix9.ix.netcom.com> NNTP-Posting-Host: net.bio.net subscribe earaid@ix.netcom.com thank you paula castanon From owner-audiology@net.bio.net Mon Sep 04 23:00:00 1995 Path: biosci!agate!newsxfer.itd.umich.edu!news.eecs.umich.edu!newshost.marcam.com!usc!cs.utexas.edu!convex!news.eng.convex.com!news.netins.net!usenet From: HearWHAC@netins.net (HearWHAC) Newsgroups: bionet.audiology Subject: Re: personality type, MBTI Date: 5 Sep 1995 03:39:13 GMT Organization: INS Info Services, Des Moines, IA, USA Lines: 40 Message-ID: <42ggp1$1f2@insosf1.netins.net> References: <429s6j$jfg@insosf1.netins.net> <42acbl$677@newsbf02.news.aol.com> NNTP-Posting-Host: s3135.netins.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 In article <42acbl$677@newsbf02.news.aol.com>, bjparker@aol.com says... > >The speech & hearing center where I work uses a similar scale to the MBTI >for the management level positions. It was made a part of the hiring >process which I think may have been a mistake. The Association for Psychological Type considers it highly unethical to administer the MBTI in the hiring process. (It is okay for a qualified consultant to use the instrument.) It is my belief it is considered unethical by different types for different reasons. The NFs get really caught up in discussing the ethics of using MBTI in the hiring process because they believe "any" person can do "any" job well. They always get angry at us SJs and accuse us of being unethical when we state our belief that some "types" are more appropriate than others for different jobs. Our (SJs) concern about using the MBTI in the hiring process is more because it really is not that accurate an instrument. It can be demonstrated that when used properly, the Myers-Briggs Type Indicator is 70 to 75% accurate. 3 out of every 4 persons will score the same "type" when retaking the MBTI at a later time. But they means 25% of the persons taking it are not going to score their "true" type! (SPs are notorious for scoring some other type when taking the MBTI!) And then when you add the "hiring process" into the equation, you really foul things up! Any person who "wants the job" is going to answer the questions the way "they think they should," not necessarily what they really believe! One of the very best books ever written on this subject, which every manager should read, is "Type Talk" by Otto Kroeger and his wife, Janet Thuesen. They suggest that you can "type" a person by observing them. This is sometimes possible, but we have found it doesn't always work. (For instance, some Introverts are especially good at concealing their true type!) We do use the MBTI in our work place, but it is strictly voluntary! We have one audiologist on our staff who has never taken it. He says he is an extreme iNtuitive. I see him as either an ENTJ or an INTJ. When we do administer the MBTI it often gives some surprises. It really is beneficial to know a person's type. By knowing it, we can respect them a lot more and make their life a lot more fun! Paul :-) From owner-audiology@net.bio.net Mon Sep 04 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!brtph500.bnr.ca!corpgate!news.utdallas.edu!not-for-mail From: dybala@utdallas.edu Newsgroups: bionet.audiology Subject: MBTI Date: 5 Sep 1995 16:44:33 -0500 Organization: The University of Texas at Dallas Lines: 13 Message-ID: <42igc1$8s2@utdallas.edu> NNTP-Posting-Host: infoserv.utdallas.edu NNTP-Posting-User: 9589 X-Newsreader: TIN [version 1.2 PL2] All of these uses of the MBTI sound interesting but..... what exactly is it? And what are the NF & SJ and all that. Please don't post your answer on this newsgroup because it is an audiology newsgroup. It sounds very interesting though! Oh & if you could recommend a good text to reference. Please respond to me via my email address dybala@callier.utdallas.edu Thank you for your support, Paul Dybala From owner-audiology@net.bio.net Mon Sep 04 23:00:00 1995 Path: biosci!daresbury!not-for-mail From: Email User Newsgroups: bionet.audiology Subject: John Gourley Date: 5 Sep 1995 07:35:38 +0100 Organization: Heidelberg MEDDAC Lines: 12 Sender: lpddist@mserv1.dl.ac.uk Distribution: bionet Message-ID: <42gr3q$7mc@mserv1.dl.ac.uk> Original-To: audiolog@dl.ac.uk Hello; I'm trying to locate John Gourley. The address he gave is . This does not seem to be a valid address. John, if you read this and still have your CAP interest please contact me. Hal McPherson mcphersh@heid-amedd.army.mil From owner-audiology@net.bio.net Tue Sep 05 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!gholland.demon.co.uk From: Gary Holland Newsgroups: bionet.audiology Subject: Speech Display Software? Date: Wed, 06 Sep 1995 22:24:46 GMT Organization: None Lines: 31 Message-ID: <354195947wnr@gholland.demon.co.uk> Reply-To: gary@gholland.demon.co.uk X-NNTP-Posting-Host: gholland.demon.co.uk X-Broken-Date: Wednesday, Sep 06, 1995 22.24.46 X-Newsreader: Newswin Alpha 0.7 Hello folks, I have recently fitted a profoundly deaf young man (28) who has been deaf since birth with an AVR FT 40 Mk2 Transposition instrument to use in conjunction with his Phonak PPC P2 Postaural instruments via mic off shoes and Audio input. Initial results are very encouraging. He has a left corner audiogram with no measurable response to pure tone above 2kHz. Using a high frequency transposition coefficient (Zc) of around 2.5 he was able to detect high frequency speech sounds with ease and can differentiate 'SH' from 'S' He is very keen to improve his speech production and whilst the Transposer will ultimately help with this he has asked if there is any software available for use with the PC which will enable him to monitor pitch and amplitude in real time. I know there were a number of commercial products available a few years ago - Visispeech?, however I am sure that with the processing power available now that there must be a hard/software package available that would help. I would be grateful for any advice / suggestions. Thanks Gary Holland UK From owner-audiology@net.bio.net Wed Sep 06 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!news.sprintlink.net!nuhou.aloha.net!NewsWatcher!user From: jamason@aloha.net (Judith A. Mason) Newsgroups: bionet.audiology Subject: Vietnam Date: Thu, 07 Sep 1995 05:54:33 -1000 Organization: Hawaii OnLine - Honolulu, HI Lines: 7 Message-ID: NNTP-Posting-Host: oahu-41.u.aloha.net Has anyone been to Vietnam in an audiological capacity? I have an opportunity to accompany an Interplast team there early in 1996 and would like to hear from anyone who has been there regarding the status of audiology in Ho Chi Minh City. Email or post. Thanks....Judith Mason -- Judith A. Mason jamason@aloha.net From owner-audiology@net.bio.net Thu Sep 07 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!news.sprintlink.net!news.ICSI.Net!news From: George Cire Newsgroups: bionet.audiology Subject: Re: Speech Display Software? Date: 8 Sep 1995 03:08:11 GMT Organization: Internet Connect Services, Inc. Lines: 16 Message-ID: <42oc2r$edp@degas.ICSI.Net> References: <354195947wnr@gholland.demon.co.uk> NNTP-Posting-Host: 199.1.106.25 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1PE (Windows; I; 16bit) To: gary@gholland.demon.co.uk Gary: I know of two software/hardware systems that might be appropriate. One is the Mac Speech Lab by GW Instruments (dont' have the address handy) it runs on an Apple Mac platform and has some extensive features. The other I know of is a software package "Spectra Plus" ver 3.0 by Pioneer Hill Sofware 24460 Mason Rd. Poulsbo, WA 98370 USA. It runs on a PC platform with Windows and requires a sound card. I run this on my laptop with ease. It has features such as a Sectragram window and a time/intensity window among other features. The software cost $395 US last I checked. I hope this is helpful. Good Luck George Cire From owner-audiology@net.bio.net Thu Sep 07 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!news.sprintlink.net!news.ICSI.Net!news From: George Cire Newsgroups: bionet.audiology Subject: Re: Speech Display Software? Date: 8 Sep 1995 03:07:14 GMT Organization: Internet Connect Services, Inc. Lines: 16 Message-ID: <42oc12$edp@degas.ICSI.Net> References: <354195947wnr@gholland.demon.co.uk> NNTP-Posting-Host: 199.1.106.25 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1PE (Windows; I; 16bit) To: garyAgholland.demon.co.uk Gary: I know of two software/hardware systems that might be appropriate. One is the Mac Speech Lab by GW Instruments (dont' have the address handy) it runs on an Apple Mac platform and has some extensive features. The other I know of is a software package "Spectra Plus" ver 3.0 by Pioneer Hill Sofware 24460 Mason Rd. Poulsbo, WA 98370 USA. It runs on a PC platform with Windows and requires a sound card. I run this on my laptop with ease. It has features such as a Sectragram window and a time/intensity window among other features. The software cost $395 US last I checked. I hope this is helpful. Good Luck George Cire From owner-audiology@net.bio.net Thu Sep 07 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!nntp0.brunel.ac.uk!strath-cs!nntphost.dur.ac.uk!hydra!des3den From: "D.J.E Nunn" Newsgroups: bionet.audiology Subject: Re: perception of direction of sounds Date: 8 Sep 1995 14:42:02 GMT Organization: University of Durham, Durham, UK Lines: 22 Sender: des3den@hydra (D.J.E Nunn) Distribution: world Message-ID: <42pknq$ll3@mercury.dur.ac.uk> References: <4260jo$2kf@newsbf02.news.aol.com> NNTP-Posting-Host: hydra.dur.ac.uk As I understand it, there are three mechanisms. -At low frequencies, the direction can be judged from the phase difference between the signals at each ear. -Below 1 kHz, the direction is judged by the difference in arrival time. (At 2-3 kHz, we judge poorly.) -Above 4 kHz, we use the intensity difference. Front/back and up/down discrimination are poor, but the pinna help this. A good starting source is "The Science of Sound" by Thomas D. Rossing. There's also a few psychoacoustics links on my acoustics page. Hope this helps, Douglas Nunn From owner-audiology@net.bio.net Fri Sep 08 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: bjparker@aol.com (BJPARKER) Newsgroups: bionet.audiology Subject: Re: perception of direction of sounds Date: 9 Sep 1995 01:20:47 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <42r87f$nbo@newsbf02.news.aol.com> References: <42pknq$ll3@mercury.dur.ac.uk> Reply-To: bjparker@aol.com (BJPARKER) NNTP-Posting-Host: newsbf02.mail.aol.com Actually, there are several good studies on the perception of sound vertically. Many came out in the 80's and can be found in JASA if you do a lit search. There was one in particular I remember because it used infants as subjects. They were surprisingly good at direct localization. Just an FYI ... From owner-audiology@net.bio.net Fri Sep 08 23:00:00 1995 Path: biosci!agate!howland.reston.ans.net!newsjunkie.ans.net!swiss.ans.net!prodigy.com!usenet From: JZPN32B@prodigy.com (Steven Rochlin) Newsgroups: bionet.audiology Subject: Re: perception of direction of sounds Date: 9 Sep 1995 06:31:41 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 14 Distribution: world Message-ID: <42rccd$1j1a@usenetp1.news.prodigy.com> References: <42pknq$ll3@mercury.dur.ac.uk> <42r87f$nbo@newsbf02.news.aol.com> NNTP-Posting-Host: inugap3.news.prodigy.com X-Newsreader: Version 1.2 Doug, Thanks for the GREAT post. It IS appreciated by this "mostly silent" lurker. Enjoy the music, Steven R. Rochlin JZPN32B@prodigy.com Audio Note Florida Gainesville, FL Home of "high-end" music reproduction equipment. Voice (904) 338-2757 Fax (904) 338-4411 From owner-audiology@net.bio.net Sun Sep 10 23:00:00 1995 Path: biosci!bloom-beacon.mit.edu!usc!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: ReSound Binaural CF Date: 11 Sep 1995 04:38:29 GMT Organization: The University of Texas at Austin Lines: 17 Message-ID: <430eg5$8vr@geraldo.cc.utexas.edu> NNTP-Posting-Host: slip-25-7.ots.utexas.edu X-Newsreader: WinVN 0.90.4 Greetings, I am curious about the binaural correction factor that ReSound has incorporated in their new programming card. I was under the impression that it does not provide enough gain and that more gain should be added "manually". My first time users are very happy with the amount of gain that the "Audio + LGOB" plus binaural correction factor gives them. What are the opinions of other ReSound dispensers? Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Sun Sep 10 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.sprintlink.net!ratty.wolfe.net!usenet From: steveh@wolfe.net (Steve Hoffman) Newsgroups: bionet.audiology Subject: New group: alt.support.hearing-loss Date: Mon, 11 Sep 1995 15:48:15 GMT Organization: Wolfe Internet Access, L.L.C. Lines: 23 Message-ID: <431m1f$1tt@news1.wolfe.net> NNTP-Posting-Host: sea-ts2-p03.wolfenet.com X-Newsreader: Forte Free Agent 1.0.82 Hi Everybody - I've just started another Newsgroup: alt.support.hearing-loss Purpose of group: Discuss hearing aids: experiences, quality, types, what to look for, where to purchase. Discuss hearing tests and audiologists. Discuss medical and alternative solutions and methods of coping. Discuss any other subjects considered relevant for this new group. Steve steveh@wolfe.net Seattle, WA From owner-audiology@net.bio.net Sun Sep 10 23:00:00 1995 Path: biosci!agate!newsxfer.itd.umich.edu!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!ucthpx!uctgsh1.uct.ac.za!snaidoo From: snaidoo@uctgsh1.uct.ac.za (Sharmala Naidoo) Newsgroups: bionet.audiology Subject: Effective Masking Levels for Ultra High Freqencies Date: Mon, 11 Sep 1995 09:26:54 GMT Organization: University of Cape Town Lines: 4 Message-ID: NNTP-Posting-Host: 196.21.6.144 X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Is there any information on effective masking levels for ultra-high frequency audiometry? Sharmala From owner-audiology@net.bio.net Mon Sep 11 23:00:00 1995 Path: biosci!daresbury!not-for-mail From: Email User Newsgroups: bionet.audiology Subject: Viral Meningitis Date: 12 Sep 1995 11:09:57 +0100 Organization: Heidelberg MEDDAC Lines: 14 Sender: lpddist@mserv1.dl.ac.uk Distribution: bionet Message-ID: <433m9l$3l0@mserv1.dl.ac.uk> Original-To: asha-aud.forum@homer.ncm.com I had a four month old in this morning for a hearing screening. The referral noted viral meningitis as the cause. The TEOAE's were robust. Anybody have any idea what the incidence of neural loss is in kids who have had viral menigitis? I might expect some temporary loss from sequelae (perhaps an 8th N neuritis) but how about percentages of youngsters with retrocochlear losses secondary to viral meningitis? Hal McPherson USAH Heidelberg Germany From owner-audiology@net.bio.net Mon Sep 11 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: hwaychild@aol.com (Hway child) Newsgroups: bionet.audiology Subject: sloping high frequency loss BTEs Date: 12 Sep 1995 00:36:35 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <4332oj$n0n@newsbf02.news.aol.com> Reply-To: hwaychild@aol.com (Hway child) NNTP-Posting-Host: newsbf02.mail.aol.com can anyone suggest BTEs that they have had good success with in fitting moderately precipitious losses, with thresholds below 15 dB to 1500 Hz , then sloping to 80 dB at 6 kHz ??? something with compression in a child-sized case would be preferred ?? also suggestions regarding earhooks would be appreciated. Thanks From owner-audiology@net.bio.net Mon Sep 11 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!newsfeed.internetmci.com!btnet!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!daresbury!not-for-mail From: Email User Newsgroups: bionet.audiology Subject: Viral Meningitis Date: 12 Sep 1995 16:43:50 +0100 Organization: Heidelberg MEDDAC Lines: 10 Sender: lpddist@mserv1.dl.ac.uk Distribution: bionet Message-ID: <4349rm$jio@mserv1.dl.ac.uk> Original-To: audiolog@dl.ac.uk Hello again, I have had some response to my posting on the incidence of retrocochlear hearing loss secondary to viral meningitis. Perhaps I should have been more specific. I was wondering if there was an increased incidence of retrocochlear loss with viral meningitis vs. bacterial meningitis. Hal From owner-audiology@net.bio.net Tue Sep 12 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: soundhrg@aol.com (SoundHrg) Newsgroups: bionet.audiology Subject: Otoscopes Date: 13 Sep 1995 14:49:12 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <437938$lrh@newsbf02.news.aol.com> Reply-To: soundhrg@aol.com (SoundHrg) NNTP-Posting-Host: newsbf02.mail.aol.com I'm looking for a Hotchkiss (sp?) Otoscope. Does anyone know who supplies them? Do any of you have one laying around that you want to sell? Better yet, is there a better Otoscope used for cerumen management? Thanks, Dale From owner-audiology@net.bio.net Tue Sep 12 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!brtph500.bnr.ca!corpgate!news.utdallas.edu!not-for-mail From: dybala@utdallas.edu Newsgroups: bionet.audiology Subject: Re: Viral Meningitis Date: 12 Sep 1995 17:06:12 -0500 Organization: The University of Texas at Dallas Lines: 19 Distribution: bionet Message-ID: <43508k$q11@utdallas.edu> References: <4349rm$jio@mserv1.dl.ac.uk> NNTP-Posting-Host: infoserv.utdallas.edu NNTP-Posting-User: 9589 X-Newsreader: TIN [version 1.2 PL2] Email User (mcphersh@heid-amedd.army.mil) wrote: > Hello again, > I have had some response to my posting on the incidence of retrocochlear > hearing loss secondary to viral meningitis. > Perhaps I should have been more specific. I was wondering if there was an > increased incidence of retrocochlear loss with viral meningitis vs. bacterial > meningitis. > Hal Hey! post some of those responses so that all of us can enjoy them. I hate to see questions with no responses. :0) Thank you for your support, Paul Dybala From owner-audiology@net.bio.net Tue Sep 12 23:00:00 1995 Path: biosci!agate!dog.ee.lbl.gov!news.cs.utah.edu!news.cc.utah.edu!news From: Loren.Randolph@m.cc.utah.edu (Loren Randolph) Newsgroups: bionet.audiology Subject: Re: sloping high frequency loss BTEs Date: Wed, 13 Sep 1995 02:17:13 GMT Organization: University of Utah Computer Center Lines: 6 Message-ID: <435evc$hv0@news.cc.utah.edu> References: <4332oj$n0n@newsbf02.news.aol.com> NNTP-Posting-Host: cts26.cc.utah.edu X-Newsreader: Forte Free Agent 1.0.82 I've used the Starkey SM-AGC for this type loss. A very small aid, good hi-freqs. As far as earhooks, I keep a bunch of different ones on hand, and just experiment ("play around") until the physical fit and the acoustical fit, measured with real-ear, looks good. Loren From owner-audiology@net.bio.net Tue Sep 12 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: pwpaton@aol.com (PWPATON) Newsgroups: bionet.audiology Subject: Re: sloping high frequency loss BTEs Date: 13 Sep 1995 15:52:33 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <437cq1$n3q@newsbf02.news.aol.com> References: <435evc$hv0@news.cc.utah.edu> Reply-To: pwpaton@aol.com (PWPATON) NNTP-Posting-Host: newsbf02.mail.aol.com Unitron's new Sound F/X mini bte fits your request. No special earhooks are required. They also offer pediatric packaging called Kid's Klub. For more information or specs you can contact Unitron at 800-521-5400. Sharon Starr From owner-audiology@net.bio.net Wed Sep 13 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!uunet!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: uncaud@aol.com (UNCAud) Newsgroups: bionet.audiology Subject: Hearing Aid WWW pages Date: 13 Sep 1995 20:00:56 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 2 Sender: root@newsbf02.news.aol.com Message-ID: <437rbo$ri@newsbf02.news.aol.com> Reply-To: uncaud@aol.com (UNCAud) NNTP-Posting-Host: newsbf02.mail.aol.com Does anyone know of any hearing aid companies who have a WWW page? Jenn From owner-audiology@net.bio.net Wed Sep 13 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.sprintlink.net!in1.uu.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!nntp0.brunel.ac.uk!strath-cs!nntphost.dur.ac.uk!akenside.dur.ac.uk!des3den From: "D.J.E Nunn" Newsgroups: bionet.audiology Subject: Re: Earmold for severe hearing loss Date: 14 Sep 1995 20:03:02 GMT Organization: University of Durham, Durham, UK Lines: 10 Sender: des3den@akenside.dur.ac.uk (D.J.E Nunn) Distribution: bionet Message-ID: <43a1pm$gs6@mercury.dur.ac.uk> References: <439567$p3v@mserv1.dl.ac.uk> NNTP-Posting-Host: akenside.dur.ac.uk Keywords: sarcasm In article <439567$p3v@mserv1.dl.ac.uk>, Email User writes: |> From recent experience and unsolicited patient feedback, I have to |> report that the Patriot earmold from All American Labs in Oklahoma City |> lives up to it's claims. You have an earplug called the 'Patriot', and it's made in the 'All American Labs'? What does it do? Filter out antiAmericanism? :^} From owner-audiology@net.bio.net Wed Sep 13 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!sunsite.doc.ic.ac.uk!daresbury!not-for-mail From: Email User Newsgroups: bionet.audiology Subject: Earmold for severe hearing loss Date: 14 Sep 1995 12:54:47 +0100 Organization: Heidelberg MEDDAC Lines: 13 Sender: lpddist@mserv1.dl.ac.uk Distribution: bionet Message-ID: <439567$p3v@mserv1.dl.ac.uk> Original-To: audiolog@dl.ac.uk From recent experience and unsolicited patient feedback, I have to report that the Patriot earmold from All American Labs in Oklahoma City lives up to it's claims. Feedback is eliminated for severe loss fittings and the fit is very comfortable, since it is essentially a canal mold. By the way, this is an unsolicted endorsement. Hal McPherson USAH Heidelberg, Germany From owner-audiology@net.bio.net Wed Sep 13 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: pwpaton@aol.com (PWPATON) Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 14 Sep 1995 18:43:46 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <43ab72$p5p@newsbf02.news.aol.com> References: <437rbo$ri@newsbf02.news.aol.com> Reply-To: pwpaton@aol.com (PWPATON) NNTP-Posting-Host: newsbf02.mail.aol.com Unitron Industries, Inc. WWW address is: http://granite.sentex.net/~unitron Patrick Paton From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!UTS.CC.UTEXAS.EDU!sirianni From: sirianni@UTS.CC.UTEXAS.EDU (Jeff Sirianni) Newsgroups: bionet.audiology Subject: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 14 Sep 1995 21:07:22 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 18 Sender: daemon@net.bio.net Distribution: world Message-ID: NNTP-Posting-Host: net.bio.net ---------- Forwarded message ---------- Date: Tue, 12 Sep 1995 13:38:39 -0500 (CDT) From: Allison M. Scott To: sirianni@uts.cc.utexas.edu Subject: presence of otoacoustic emissions in profoundly deaf child I recently learned about a 16-month-old girl who was unresponsive to sounds during behavioral testing and whose ABR only had a recordable wave I at high intensity levels. Even though she is profoundly deaf she has recordable otoacoustic emissions. This suggests that her cochlea is normal and the problem lies within the central auditory system. A tactaid seems to be the only type of assistive device that may aid her in developing an awareness of sounds. Has anybody else heard of a similar case? Are there any other devices that may aid this girl in developing sound awareness? Could a cochlea with measurable OAEs be abnormal? From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!agate!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Endorsements are Fine Date: 15 Sep 1995 04:58:33 GMT Organization: The University of Texas at Austin Lines: 31 Message-ID: <43b15p$sp1@geraldo.cc.utexas.edu> References: <439567$p3v@mserv1.dl.ac.uk> NNTP-Posting-Host: slip-17-10.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <439567$p3v@mserv1.dl.ac.uk>, Email User says: > > >From recent experience and unsolicited patient feedback, I have to >report that the Patriot earmold from All American Labs in Oklahoma City >lives up to it's claims. > >Feedback is eliminated for severe loss fittings and the fit is very >comfortable, since it is essentially a canal mold. > >By the way, this is an unsolicted endorsement. > >Hal McPherson >USAH >Heidelberg, Germany I would consider this an endorsement rather than a solicitation. I believe that readers of this group enjoy suggestions posted by fellow audiologists in the "trenches". Our solicitation bylaw in the newsgroup prospectus only discourages those folks with direct affiliation with a manufacturer from saying that their product is better than some other product. For example, "Our ABC hearing aid is better than XYZ's ABC hearing aid". Please keep up the suggestions..... Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 15 Sep 1995 04:51:31 GMT Organization: The University of Texas at Austin Lines: 20 Message-ID: <43b0oj$sp1@geraldo.cc.utexas.edu> References: <437rbo$ri@newsbf02.news.aol.com> NNTP-Posting-Host: slip-17-10.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <437rbo$ri@newsbf02.news.aol.com>, uncaud@aol.com (UNCAud) says: > >Does anyone know of any hearing aid companies who have a WWW page? >Jenn As far as I know, Unitron is the only one with a WWW page. It is under construction (I beleive) since it is pretty brief at this time. I have spoken with "computer folks" from other manufacturers and they have some in the idea stage right now. The WWW Page address for Unitron is http://www.sentex.net/~unitron Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!nntp.crl.com!NewsWatcher!user From: rpluta@crl.com (Robert Pluta) Newsgroups: bionet.audiology Subject: Re: Otoscopes Date: Thu, 14 Sep 1995 23:13:42 -0600 Organization: Hodie Nickels Inc. Lines: 23 Message-ID: References: <437938$lrh@newsbf02.news.aol.com> NNTP-Posting-Host: crl12.crl.com In article <437938$lrh@newsbf02.news.aol.com>, soundhrg@aol.com (SoundHrg) wrote: > I'm looking for a Hotchkiss (sp?) Otoscope. Does anyone know who supplies > them? Do any of you have one laying around that you want to sell? > > Better yet, is there a better Otoscope used for cerumen management? Dale, I'm ignorant about the Hotchkiss but there seems to be a big sales push towards video otoscopes. I've not used one but have seen demos and it looks to be the best for *cerumenectomies* :D Starkey will sell you one right quickly! hth, Rob -- ------------------------***-----------***-----------***-------------- Rob Pluta "The truth is the light, the light is the way, 5380 Medical #405 the less folks know, the more they have to say." San Antonio TX 78240 --The Remains, c.1966 From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.sprintlink.net!in1.uu.net!comp.vuw.ac.nz!canterbury.ac.nz!cantva!exti047 From: John Gourley Newsgroups: bionet.audiology Subject: Re: Earmold for severe hearing loss Date: 16 Sep 95 00:46:25 +1200 Organization: University of Canterbury, Christchurch, New Zealand Lines: 19 Message-ID: <1995Sep16.004625@cantva> References: <439567$p3v@mserv1.dl.ac.uk> NNTP-Posting-Host: cantva.canterbury.ac.nz In article <439567$p3v@mserv1.dl.ac.uk>, Email User writes: > > ....unsolicited patient feedback..(using)..the Patriot > earmold..Feedback is eliminated... Now that's the sort of earmold I could *really* use! ;-) > Hal McPherson Hal, did you get my e-mail? I'm not sure why your e-mails to me are "bouncing" - unless I'm subscribed to some sort of "Patriot" user system that I didn't know about! If you still can't contact me I'll give you my top secret snail-mail address. Hope to hear from you soon, John ps. Thanks for naming a thread after me - just a shame no-one else followed up on it. From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!tank.news.pipex.net!pipex!in1.uu.net!news.u.washington.edu!mascher From: mascher@u.washington.edu (Kelley Mascher) Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 15 Sep 1995 22:47:23 GMT Organization: University of Washington Lines: 48 Message-ID: <43cvpr$55e@nntp3.u.washington.edu> References: NNTP-Posting-Host: saul5.u.washington.edu NNTP-Posting-User: mascher Without seeing the emission recording it is hard to make any judgement. Several people over the years have shown me emissions in an otherwise deaf child. In all cases there was as a problem in the recording. If you record emissions ( DPs especially ) at too high a stimulus level, you will get a response. This is the distortion from the driver overloading. The individual ear canal will have some effect on the overload point. As a result, I believe, you cam never draw a conclusion from a DP recorded at a single level. Transient emission are a little more forgiving in this respect but if you question the results at a high level, test at a lower level to confirm them. We have seen children who have emissions and no ABR. They have always had some additional neuological involvement. Is this a possibility in your case? To return to my initial comment, if I were you I would want to know as much as possible about the circumstances of the emission recording. Kelley Mascher (206) 528-2713 Children's Hospital & Med. Center mascher@u.washington.edu Audiology Research sirianni@UTS.CC.UTEXAS.EDU (Jeff Sirianni) writes: >---------- Forwarded message ---------- >Date: Tue, 12 Sep 1995 13:38:39 -0500 (CDT) >From: Allison M. Scott >To: sirianni@uts.cc.utexas.edu >Subject: presence of otoacoustic emissions in profoundly deaf child > I recently learned about a 16-month-old girl who was unresponsive >to sounds during behavioral testing and whose ABR only had a recordable >wave I at high intensity levels. Even though she is profoundly deaf she >has recordable otoacoustic emissions. This suggests that her cochlea is >normal and the problem lies within the central auditory system. A >tactaid seems to be the only type of assistive device that may aid her in >developing an awareness of sounds. > Has anybody else heard of a similar case? Are there any other >devices that may aid this girl in developing sound awareness? Could a >cochlea with measurable OAEs be abnormal? -- Kelley Mascher (206) 528-2713 Children's Hospital & Med. Center mascher@u.washington.edu Audiology Research From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!news.sprintlink.net!in1.uu.net!news1.digital.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.ucalgary.ca!babymac.ear.ucalgary.ca!user From: dbrown@haircell.ear.ucalgary.ca (David K. Brown) Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: Fri, 15 Sep 1995 13:52:09 -0700 Organization: Hearing Research Lab, University of Calgary Lines: 30 Distribution: world Message-ID: References: NNTP-Posting-Host: @babymac.ear.ucalgary.ca In article , sirianni@UTS.CC.UTEXAS.EDU (Jeff Sirianni) wrote: > ---------- Forwarded message ---------- > I recently learned about a 16-month-old girl who was unresponsive > to sounds during behavioral testing and whose ABR only had a recordable > wave I at high intensity levels. Even though she is profoundly deaf she > has recordable otoacoustic emissions. This suggests that her cochlea is > normal and the problem lies within the central auditory system. A > tactaid seems to be the only type of assistive device that may aid her in > developing an awareness of sounds. > Has anybody else heard of a similar case? Are there any other > devices that may aid this girl in developing sound awareness? Could a > cochlea with measurable OAEs be abnormal? To date I have found three such cases, each one with different situations and etiologoies. The question they came with was why are they rejecting their amplification and why does it not appear to help? When emissions were shown to be present we removed their amplification. The Tactaid sounds like an interesting way to go, let us know what happens. It is possible that a cochlea with measurable OAEs could be abnormal, Takeno et al. (1994) using carboplatinum was able to destroy the IHC in chinchillas but leave the OHC intact. They found that AP thresholds were elevated where there was IHC damage but that cochlear microphonic thresholds were close to normal corresponding to the preservation of OHC. This suggests that OAEs may still be present but the cochlea would surely be damaged. The OAE portion has not yet been proven but based on their findings it might be possible. (Sounds like a possible thesis topic to me!). David Brown From owner-audiology@net.bio.net Thu Sep 14 23:00:00 1995 Path: biosci!UTS.CC.UTEXAS.EDU!sirianni From: sirianni@UTS.CC.UTEXAS.EDU (Jeff Sirianni) Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 15 Sep 1995 07:06:14 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 30 Sender: daemon@net.bio.net Distribution: world Message-ID: NNTP-Posting-Host: net.bio.net ---------- Forwarded message ---------- Date: Fri, 15 Sep 1995 08:53:52 -400 (EDT) From: Ron Blue To: Jeff Sirianni Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) On 14 Sep 1995, Jeff Sirianni wrote: > > ---------- Forwarded message ---------- > Date: Tue, 12 Sep 1995 13:38:39 -0500 (CDT) > From: Allison M. Scott > To: sirianni@uts.cc.utexas.edu > Subject: presence of otoacoustic emissions in profoundly deaf child > > I recently learned about a 16-month-old girl who was unresponsive > to sounds during behavioral testing and whose ABR only had a recordable > wave I at high intensity levels. Even though she is profoundly deaf she > has recordable otoacoustic emissions. This suggests that her cochlea is > normal and the problem lies within the central auditory system. A > tactaid seems to be the only type of assistive device that may aid her in > developing an awareness of sounds. > Has anybody else heard of a similar case? Are there any other > devices that may aid this girl in developing sound awareness? Could a > cochlea with measurable OAEs be abnormal? > What did the neurologist say? Ron Blue From owner-audiology@net.bio.net Fri Sep 15 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 16 Sep 1995 14:05:56 GMT Organization: The University of Texas at Austin Lines: 33 Message-ID: <43elk4$bm3@geraldo.cc.utexas.edu> References: <43cvpr$55e@nntp3.u.washington.edu> NNTP-Posting-Host: slip-11-9.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <43cvpr$55e@nntp3.u.washington.edu>, mascher@u.washington.edu (Kelley Mascher) says: > >Without seeing the emission recording it is hard to make any judgement. >Several people over the years have shown me emissions in an otherwise >deaf child. In all cases there was as a problem in the recording. > >If you record emissions ( DPs especially ) at too high a stimulus level, >you will get a response. This is the distortion from the driver overloading. >The individual ear canal will have some effect on the overload point. As >a result, I believe, you cam never draw a conclusion from a DP recorded at >a single level. Transient emission are a little more forgiving in this >respect but if you question the results at a high level, test at a >lower level to confirm them. {SNIP} >To return to my initial comment, if I were you I would want to know as >much as possible about the circumstances of the emission recording. To Kelly : If this is the case, would it be practical to test one's equipment in a calibration chamber (i.e. 2 cc) to see if acoustic DP's arise due to transducer overload? I understand that in a 16-month old one would want a smaller chamber... Thanks go to Allison Scott for bringing up this topic.... Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Fri Sep 15 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!brtph500.bnr.ca!corpgate!news.utdallas.edu!not-for-mail From: dybala@utdallas.edu Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 13 Sep 1995 19:23:00 -0500 Organization: The University of Texas at Dallas Lines: 25 Message-ID: <437sl4$3vk@utdallas.edu> References: <437rbo$ri@newsbf02.news.aol.com> NNTP-Posting-Host: infoserv.utdallas.edu NNTP-Posting-User: 9589 X-Newsreader: TIN [version 1.2 PL2] UNCAud (uncaud@aol.com) wrote: > Does anyone know of any hearing aid companies who have a WWW page? > Jenn Starkey is supposed to open up a Web Site this fall sometime. It will be called hear net and they are talking about letting persons get acess to thier own account info such as #aids sold, # returns, info on circuts etc. They have a lot of different dept. working on it marketing, audiology, computer people, etc. so I don't know how long it will take to get it up and running. Right now sequel circut info is what they are pushing so we shall see! Unitron, I heard has one up, but I am not for sure. I HAVE AN IDEA! We could create a demand by calling companies and asking if they have one or if they are developing one. If they get enough calls maybe they would hurry up and or go "Gee, maybe the internet is useful and cost effective, and a way to advertise and educate. It would be a toll free call. >;) Thank you for your support, Paul Dybala From owner-audiology@net.bio.net Fri Sep 15 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!bcarh189.bnr.ca!brtph500.bnr.ca!corpgate!news.utdallas.edu!not-for-mail From: dybala@utdallas.edu Newsgroups: bionet.audiology Subject: Re: Otoscopes Date: 13 Sep 1995 19:31:58 -0500 Organization: The University of Texas at Dallas Lines: 32 Message-ID: <437t5u$4b0@utdallas.edu> References: <437938$lrh@newsbf02.news.aol.com> NNTP-Posting-Host: infoserv.utdallas.edu NNTP-Posting-User: 9589 X-Newsreader: TIN [version 1.2 PL2] SoundHrg (soundhrg@aol.com) wrote: > I'm looking for a Hotchkiss (sp?) Otoscope. Does anyone know who supplies > them? Do any of you have one laying around that you want to sell? > Better yet, is there a better Otoscope used for cerumen management? > Thanks, > Dale Hotchkiss (sp!) Otoscopes can be purchased from Preferred Products PO BOX 150624 San Rafael CA 94915-0624 415 499 3544 1800 4453544 fax 415 499 3551 A Welch Allen otoscope with an open operating head can be useful in that it gives you room to put a curette down the specula at get to the stuff with a good amount of illumination. But all of that stuff seems to get in the way. I like to use a headlamp and a currette if I can. BTW preferred products has a whole line of cerumen mgmt equipment currettes, irrigators, etc, they even have a Cerumen Mugnt Starter Kit (Oooh, Aaaah) that the ADA put together. Give em a call. Thank you for your support, Paul Dybala From owner-audiology@net.bio.net Sat Sep 16 23:00:00 1995 Path: biosci!agate!library.ucla.edu!unixg.ubc.ca!news.bc.net!news.uoregon.edu!news.sprintlink.net!news.oz.net!news.worldcom.com!news.sesqui.net!uuneo.neosoft.com!usenet From: Joe Williams Newsgroups: bionet.audiology Subject: New web page - audio stuff Date: 17 Sep 1995 20:55:44 GMT Organization: The Williams Company Lines: 8 Message-ID: <43i20g$p6n@uuneo.neosoft.com> NNTP-Posting-Host: scooter-slip-d4.neosoft.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) See our new web page at http://www.neosoft.com/~twc , we still have a lot of work to do....but here it is ....please visit and tell your friends if you find our site interesting. Thanks for visiting, Joe Williams (twc@neosoft.com) From owner-audiology@net.bio.net Sun Sep 17 23:00:00 1995 Path: biosci!ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!cpmt.cyberport.net!usenet From: Alan Sias Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 18 Sep 1995 00:21:46 GMT Organization: Audiology Services for Montana Lines: 5 Message-ID: <43ie2q$e0l@cpmt.cyberport.net> References: <437rbo$ri@newsbf02.news.aol.com> <43b0oj$sp1@geraldo.cc.utexas.edu> NNTP-Posting-Host: cpmt2.cyberport.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b1 (Windows; I; 16bit) I have just returned from a 3M training. They said that they did. They couldn't remember the address but it has something to do with mmm.com. Alan Sias From owner-audiology@net.bio.net Sun Sep 17 23:00:00 1995 Path: biosci!MAGNUS.ACS.OHIO-STATE.EDU!smorelan From: smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) Newsgroups: bionet.audiology Subject: assistance needed!!!! Date: 18 Sep 1995 13:43:22 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 21 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509182040.QAA26370@top.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net i am at that wonderful time in my college career when it is time to write my comprehensive exam. oh joy. it is a take-home test and i am allowed to use whatever resources i can find, which is why i'm writing to you all. here's the question that i need help with. i am asked to furnish a new audiological clinic with necessary equipment. i have $75,000.00 to spend on the project. the trouble is that i am not familiar with the prices of individual pieces of equipment and i need to access some pricing info asap. can anyone direct me to a web site that advertises audiometers and such? are there any other resources on the net? perhaps the phone number of a good dealer? any other ideas? i'm not looking for anyone to answer the question for me, but i could use an assist to access resources. i need to turn this in this friday so time is of the essence. i doubt that anyone else would be interested in this topic, so private email replies are greatly appreciated. thanks so much in advance! susan we stroll together silently, just the two of us -- my wolf and me... From owner-audiology@net.bio.net Sun Sep 17 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!uunet!in1.uu.net!utcsri!newsflash.concordia.ca!news.mcgill.ca!VM1.MCGILL.CA From: "SHAHNAZ,NAVID,MR" Newsgroups: bionet.audiology Subject: 90% range? Date: 18 SEP 95 14:31:35 EST Organization: McGill University Lines: 14 Sender: usenet@MUSICB.MCGILL.CA Message-ID: <18SEP95.15688720.0089@VM1.MCGILL.CA> NNTP-Posting-Host: vm1.mcgill.ca Since the admittance values are positively skewed, it has been suggested that means, SDs and confidence intervals can not provide a valid range of normative admittance values.Therefore, it's been suggested that to report 90% range instead of for eg. +/- 2SD. Although the skewness of my data for middle ear resonance freq. is about 0.5, however, in order to be consistent with the available literature I'd like to report the 90% range as my diagnostic criteril. The problem is, I'm not sure whether this range is computed the same way as 90th percentile. If any one knows the precise procedure for computation of this range (the formula) it is very much appreciated if he/she can inform me through my e-mail (b2hc@musicb.mcgill.ca). Thanks Navid From owner-audiology@net.bio.net Sun Sep 17 23:00:00 1995 Path: biosci!ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!cpmt.cyberport.net!usenet From: Alan Sias Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 18 Sep 1995 00:23:16 GMT Organization: Audiology Services for Montana Lines: 4 Message-ID: <43ie5k$e0l@cpmt.cyberport.net> References: <437rbo$ri@newsbf02.news.aol.com> <437sl4$3vk@utdallas.edu> NNTP-Posting-Host: cpmt2.cyberport.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b1 (Windows; I; 16bit) OR what if they all got e-mail so that we could email our orders.... Alan Sias From owner-audiology@net.bio.net Sun Sep 17 23:00:00 1995 Path: biosci!galaxy.ucr.edu!ihnp4.ucsd.edu!swrinde!howland.reston.ans.net!news.sprintlink.net!cpmt.cyberport.net!usenet From: Alan Sias Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 18 Sep 1995 00:14:10 GMT Organization: Audiology Services for Montana Lines: 12 Message-ID: <43idki$e0l@cpmt.cyberport.net> References: NNTP-Posting-Host: cpmt2.cyberport.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b1 (Windows; I; 16bit) There is a device called "teacher" that was being developed by a gentleman in Washington (Spokane, I think). It showed some promise. I had a friend with a child that has Waardenburg's syndrome and was deaf. The only reason they didn't go with it is the inventor is... um... less than socially adept. If you are interested email, and I'll try to get the info for you. Alan Sias Audiology Services for Montana arsias@cyberport.net From owner-audiology@net.bio.net Mon Sep 18 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!uunet!in1.uu.net!noc.near.net!das-news2.harvard.edu!oitnews.harvard.edu!purdue!mozo.cc.purdue.edu!expert.cc.purdue.edu!dinosawr From: dinosawr@expert.cc.purdue.edu Newsgroups: bionet.audiology Subject: Re: Newsgroup bionet.audiology, Articles 489-497 Date: 19 Sep 1995 11:45:20 GMT Organization: Purdue University Lines: 22 Message-ID: <43magg$7i5@mozo.cc.purdue.edu> NNTP-Posting-Host: expert.cc.purdue.edu Originator: dinosawr@expert.cc.purdue.edu I am a second year graduate student at Purdue University. I have been reading this news group for three months now and I absolutely love it! It's really great being able to read comments and questions from audiologists who are "out there in the trenches" :-) It is getting close to the time when all of us audiology students are preparing ourselves for final comps and eventually jobs. I would be very interested in reading about any of your interesting stories/experiences re: comps, externships, first audiology jobs, or anything related to audiology on a personal level that you find interesting and would like to share. Please post respones instead of e-mailing them. I know I am not the only interested student out here :-)! Thanks a lot Diana Sowers, future audiologist p.s. anyone out there looking for a CFY in the Chicagoland area? (smiles) From owner-audiology@net.bio.net Mon Sep 18 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in1.uu.net!noc.near.net!das-news2.harvard.edu!oitnews.harvard.edu!purdue!mozo.cc.purdue.edu!expert.cc.purdue.edu!gnye From: gnye@expert.cc.purdue.edu (Gayle Nye) Newsgroups: bionet.audiology Subject: crossroads Date: 19 Sep 1995 19:10:12 GMT Organization: Purdue University Computing Center Lines: 17 Message-ID: <43n4ik$rot@mozo.cc.purdue.edu> NNTP-Posting-Host: expert.cc.purdue.edu Hello Friends, I am writing to announce the annual Crossroads conference here at Purdue University in West Lafayette. The Conference is being held September 28-30, and it is sponsored by Purdue NSSLHA and The United States Society for Augmentative/Alternative Communication. There is lots of info, but I have a ten minute time limit at this terminal. I will try to post more info about prices and accomodations and other specifics soon. If you are interested, write to me: gnye@expert.cc.purdue.edu Thanks! Gayle From owner-audiology@net.bio.net Mon Sep 18 23:00:00 1995 Path: biosci!mail.coin.missouri.edu!ascott From: ascott@mail.coin.missouri.edu ("Allison M. Scott") Newsgroups: bionet.audiology Subject: presence of otoacoustic emissions in individuals with h.i. Date: 19 Sep 1995 14:46:03 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 28 Sender: daemon@net.bio.net Distribution: world Message-ID: NNTP-Posting-Host: net.bio.net I recently read an article in "European Archives of Otolaryngology", Vol. 250. pgs 366-368 which is of great interest. A 6-year-old boy with unilateral deafness was found to have otoacoustic emissions in his deaf ear. A full test battery showed a flat ABR, Neg ENG results, Neg CT scan, and a normal neurologic work-up. Upon electrostimulation of the auditory nerve, the young boy consistently reported a hearing sensation. The authors of this study determined that there was a large enough population of OHCs to cause an OAE, and an IHC disorder is to be expected due to electrostimulation results. Another interesting article can be found in "Journal of Speech and Hearing Research" Vol. 34, pages 379-385. This is also a case study about an individual with severe hearing loss who has otoacoustic emissions. Once again, these OAEs in the presence of severe hearing loss are attributed to some surviving OHCs but damaged IHCs or nerve fibers. The authors of this study go on to discuss several other studies that found otoacoustic emissions in people with severe or profound hearing loss. They criticize these studies for lack of adequate controls and suggest that the measured OAEs may merely be artifacts caused by nonlinearities of the measuring system or improper fit of the probe tube in the ear canal. This brings to light the need to use adequate controls when using OAEs in daily clinical applications. I still reserve a healthy skepticism about the use of OAEs beyond as a screening tool. Is anybody else having trouble warming up to clinical use of OAEs? From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!uunet!in2.uu.net!noc.near.net!das-news2.harvard.edu!oitnews.harvard.edu!purdue!mozo.cc.purdue.edu!expert.cc.purdue.edu!dinosawr From: dinosawr@expert.cc.purdue.edu Newsgroups: bionet.audiology Subject: Re: audiology and the internet Date: 19 Sep 1995 22:06:44 GMT Organization: Purdue University Lines: 7 Message-ID: <43netk$7ug@mozo.cc.purdue.edu> NNTP-Posting-Host: expert.cc.purdue.edu Originator: dinosawr@expert.cc.purdue.edu I am looking for any information about audiology and the internet or audiology and www. Any leads would be helpful. Has anyone seen any ‚ articles or read anything about this? Please let me know. Thanks Diana Sowers From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!MAGNUS.ACS.OHIO-STATE.EDU!smorelan From: smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 20 Sep 1995 14:13:28 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 29 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509202110.RAA26462@beauty.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net > My understanding is that the hair cells themselves are not >very specific or "selective" to particular frequencies. That is, when a >particular frequency is sounded, a whole range of hair cells whose natural >harmonic frequencies are above and below the frequency of the sound, are >excited. My recollection is that the band is very broad and fairly well >centered around the hair cells whose natural frequency matches that of >the sound. However, the actual perception of a "frequency" occurs from >some filtering process in the nervous system. This, I'm afraid, is very >poorly understood? I am sure that a more precise answer to your question >is known but I can only surmise that the 5000Hz cells will certainly be >stimulated by the 6000Hz pure tone. > > i only wanted to add that the size "critical bands" are proportional to the center frequency so that low frequency bands/filters are narrower than high frequency ones. this explains why we are better able to resolve, or hear out, lower frequencies than high frequencies. yes, i'm still working on my comps (thanks for all the help everyone!) and one of my questions dealt with the power spectrum modeal. i'm afraid this particular subject is all too fresh in my mind. ;) susan we stroll together silently, just the two of us -- my wolf and me... From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!LEX.LCCC.EDU!rcb1 From: rcb1@LEX.LCCC.EDU (Ron Blue) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 20 Sep 1995 05:48:29 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 24 Sender: daemon@net.bio.net Distribution: world Message-ID: References: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: net.bio.net On 20 Sep 1995, Eric Smith wrote: > How well does the cochlea divide sound into its frequency components? > For example, a 100 dB, 6000 Hz, pure tone, stimulates the hair cells > for 6000 Hz. But does it avoid stimulating any 5000 Hz hair cells at > all, or does it stimulate those with a small fraction of the energy it > applies to the 6000 Hz hair cells? Can anyone supply any kind of > formula for estimating how much stimulation there will be at different > frequencies when a single pure tone is applied? Interesting question. I believe according to my model you should observe a gaussian distribution. If you do not please inform me of your results. Ron Blue The following is available by FTP: Note: this is Unix system which is case sensitive. ftp.tmn.com login: anonymous password: (your email address) cd Chaos-Complexity ls get BlueBlue-OpponentProcessing.txt bye From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!news.cinenet.net!not-for-mail From: erc@cinenet.net (Eric Smith) Newsgroups: bionet.audiology Subject: Cochlea -- quality of filtering Date: 20 Sep 1995 02:07:47 -0700 Organization: Cinenet Communications, Internet Access, Santa Monica, USA Lines: 9 Message-ID: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: hollywood.cinenet.net How well does the cochlea divide sound into its frequency components? For example, a 100 dB, 6000 Hz, pure tone, stimulates the hair cells for 6000 Hz. But does it avoid stimulating any 5000 Hz hair cells at all, or does it stimulate those with a small fraction of the energy it applies to the 6000 Hz hair cells? Can anyone supply any kind of formula for estimating how much stimulation there will be at different frequencies when a single pure tone is applied? From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!news.sprintlink.net!news3.insinc.net!granite.sentex.net!usenet From: Unitron Industries Ltd Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 20 Sep 1995 13:10:34 GMT Organization: Sentex Communications Corporation Lines: 13 Message-ID: <43p3sa$bqh@granite.sentex.net> References: <437rbo$ri@newsbf02.news.aol.com> <437sl4$3vk@utdallas.edu> <43p3i0$bqh@granite.sentex.net> NNTP-Posting-Host: p11.gallium.sentex.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Sorry about not including the addresses below in the previous post. Someone had disabled the signature file. ------------------------------ Unitron Industries Ltd 20 Beasley Dr. Kitchener, ON N2G 4X1 http://www.sentex.net/~unitron email:webmaster@unitron.com ------------------------------ From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!news3.insinc.net!granite.sentex.net!usenet From: Unitron Industries Ltd Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 20 Sep 1995 13:05:04 GMT Organization: Sentex Communications Corporation Lines: 13 Message-ID: <43p3i0$bqh@granite.sentex.net> References: <437rbo$ri@newsbf02.news.aol.com> <437sl4$3vk@utdallas.edu> NNTP-Posting-Host: p11.gallium.sentex.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) dybala@utdallas.edu wrote: >UNCAud (uncaud@aol.com) wrote: >> Does anyone know of any hearing aid companies who have a WWW page? >> Jenn >Unitron, I heard has one up, but I am not for sure. Yes at Unitron, we do have a home page up. It's been on-line since March of this year. We are currently working on an on-line catalog of products. It should be available in a month or so. We will also include links to other hearing related sites so if anyone has some URL's, please email them. Thanks. From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!WELCHLINK.WELCH.JHU.EDU!dakaiser From: dakaiser@WELCHLINK.WELCH.JHU.EDU (DONALD A KAISER) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 20 Sep 1995 12:51:53 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 35 Sender: daemon@net.bio.net Distribution: world Message-ID: References: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: net.bio.net Don A. Kaiser Cell Biology 117 WBSB Johns Hopkins Univ. Sch. of Medicine 725 No. Wolfe St. Baltimore MD 21205 410-955-5672 TEL 410-955-4129 FAX On 20 Sep 1995, Eric Smith wrote: > > How well does the cochlea divide sound into its frequency components? > For example, a 100 dB, 6000 Hz, pure tone, stimulates the hair cells > for 6000 Hz. But does it avoid stimulating any 5000 Hz hair cells at > all, or does it stimulate those with a small fraction of the energy it > applies to the 6000 Hz hair cells? Can anyone supply any kind of > formula for estimating how much stimulation there will be at different > frequencies when a single pure tone is applied? > My understanding is that the hair cells themselves are not very specific or "selective" to particular frequencies. That is, when a particular frequency is sounded, a whole range of hair cells whose natural harmonic frequencies are above and below the frequency of the sound, are excited. My recollection is that the band is very broad and fairly well centered around the hair cells whose natural frequency matches that of the sound. However, the actual perception of a "frequency" occurs from some filtering process in the nervous system. This, I'm afraid, is very poorly understood? I am sure that a more precise answer to your question is known but I can only surmise that the 5000Hz cells will certainly be stimulated by the 6000Hz pure tone. From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!newsrelay.iastate.edu!newsxfer.itd.umich.edu!news.itd.umich.edu!199.166.med.umich.edu!boismier From: boismier@umich.edu (Tom Boismier, MPH) Newsgroups: bionet.audiology Subject: Re: audiology and the internet Date: Wed, 20 Sep 1995 08:19:23 LOCAL Organization: University of Michigan Lines: 8 Message-ID: References: <43netk$7ug@mozo.cc.purdue.edu> NNTP-Posting-Host: 199.166.med.umich.edu X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <43netk$7ug@mozo.cc.purdue.edu> dinosawr@expert.cc.purdue.edu writes: > I am looking for any information about audiology and the internet or > audiology and www. Any leads would be helpful. Has anyone seen any > ‚ articles or read anything about this? Please let me know. Thanks David Baguley and I have recently written an article for the British Journal of Audiology which should be published within the next 2-3 months. From owner-audiology@net.bio.net Tue Sep 19 23:00:00 1995 Path: biosci!PACIFIER.COM!chollevo From: chollevo@PACIFIER.COM (Catherine Hollevoet) Newsgroups: bionet.audiology Subject: subscribe Date: 18 Sep 1995 19:51:22 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 3 Sender: daemon@net.bio.net Distribution: world Message-ID: subscribe chollevo@pacifier.com From owner-audiology@net.bio.net Wed Sep 20 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!wb3ffv!cs.umd.edu!mojo.eng.umd.edu!didier From: didier@eng.umd.edu (Didier A. Depireux) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 20 Sep 1995 13:20:28 GMT Organization: University of Maryland, College Park Lines: 31 Distribution: world Message-ID: <43p4es$72o@mojo.eng.umd.edu> References: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: reggae.src.umd.edu Originator: didier@reggae.src.umd.edu erc@cinenet.net (Eric Smith) writes: > >How well does the cochlea divide sound into its frequency components? > Very poorly! The early experiments of von Bekesy used cochleae from fresh human cadavers and at least showed that the passive mechanics of the cochlea are such that the traveling wave that propagates down the basilar membrane (the membrane where the hair cells that measure vibrations are located) excites very large regions of the membrane for any pure tone presented to the ear. When the cochlea is 'alive' (inside a living organism), the frequency selectivity is a lot better, thanks for the outer hair cells. Anyway, you probably don't want this to be too technical, so I would advise you to look at http://www.boystown.org/cel/cochmech.html if you are really interested. The traveling wave portion of that page, http://www.boystown.org/cel/waves.html contains some mpegs showing you the basilar membrane displacements for a series of pure tones and clicks, and will leave you wondering how we can have such a good frequency selectivity... Check it out! The rest of the page (the first address I gave) is also important to understand how the ear works, esp the part about outer hair cell motility. If you want to learn more about the inner ear anatomy, you should check out another really great page, http://lab9924.wustl.edu/Intro1.htm from the cochlear fluid lab at Washington University. It talks about how some disease of the inner ear damage your hearing... Didier didier@src.umd.edu From owner-audiology@net.bio.net Wed Sep 20 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!miwok!srf-35.nbn.com!user From: olh@hyperback.com. (Bob Olhsson) Newsgroups: bionet.audiology Subject: need referrals Date: Tue, 19 Sep 1995 18:57:13 -0700 Organization: Bob Olhsson Audio Lines: 24 Message-ID: NNTP-Posting-Host: srf-38.nbn.com My 87 year old mother needs her hearing aids upgraded. Estimates have ranged from $150 to $2000 dollars and she has no idea what to make of the price spread but is very suspect of rip-offs as any sane sr. citizen ought to be. I have been very impressed with recent earphone developments in my sound recording work and suspect this technology has made it into hearing aids also. Can anybody suggest a reasonable, first-rate manufacturer and an audiologist in the Detroit area? Thanks, Bob -- Bob Olhsson Audio | O tongue, thou art olh@hyperback.com | a treasure without end. P.O. Box 555 | And, O tongue, thou art also a Novato, CA 94948 | disease without remedy. 415.457.2620 | == Jelal'uddin Rumi == 415.456.1496 FAX From owner-audiology@net.bio.net Wed Sep 20 23:00:00 1995 Path: biosci!agate!lazzaro From: lazzaro@snap.CS.Berkeley.EDU (John Lazzaro) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 21 Sep 1995 20:09:20 GMT Organization: University of California, Berkeley Lines: 21 Message-ID: <43sgpg$cv4@agate.berkeley.edu> References: <43oll3$gt2@hollywood.cinenet.net> <43p4es$72o@mojo.eng.umd.edu> NNTP-Posting-Host: snap.cs.berkeley.edu In article <43p4es$72o@mojo.eng.umd.edu>, Didier A. Depireux wrote: > >The traveling wave portion of that page, >http://www.boystown.org/cel/waves.html >contains some mpegs showing you the basilar membrane displacements for a >series of pure tones and clicks, and will leave you wondering how we can >have such a good frequency selectivity... Hmm, someone should do a Web page for the auditory brainstem, to supply the small part of the answer to this question that's known ... -- ------------------------------------------------------------------------------- John Lazzaro My Home Page: http://http.cs.berkeley.edu/~lazzaro lazzaro@cs.berkeley.edu Chipmunk CAD: http://www.pcmp.caltech.edu/chipmunk/ ------------------------------------------------------------------------------- From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!news.sprintlink.net!in2.uu.net!winternet.com!news.cinenet.net!not-for-mail From: erc@cinenet.net (Eric Smith) Newsgroups: bionet.audiology Subject: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: 21 Sep 1995 11:00:15 -0700 Organization: Cinenet Communications, Internet Access, Santa Monica, USA Lines: 15 Message-ID: <43s97f$1a9@hollywood.cinenet.net> References: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: hollywood.cinenet.net Thanks for all the answers (and references) to my question about the quality of filtering in the cochlea, both here and by email. The general consensus seems to be that the quality of filtering is not very high. My next question is about the implications of this in cases where the hair cells are defective at some frequencies but not others. It seems like the person would still hear tones of those frequencies, but they would sound like other frequencies, and would have a higher threshold. But an audiogram does not ask what the tones sound like, just whether they can be heard at all. Thus, some people who are actually 100% deaf at some frequencies but have normal hearing at others, might have a very misleading audiogram. From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!oto.liu.se!JohHe From: JohHe@oto.liu.se (Johan Hellgren) Newsgroups: bionet.audiology Subject: Re: Hearing Aid WWW pages Date: 22 Sep 1995 00:22:23 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 15 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509220916.AA04363@hulio.liu.se> Reply-To: JohHe@oto.liu.se NNTP-Posting-Host: net.bio.net Oticon has a WWW page. The address is http://www.oticon.dk/ At the moment there is information about their new digital hearing aid. --------------------------------------------------------------------- Johan Hellgren Dept of Technical Audiology Link=F6ping University S-581 85 Link=F6ping Sweden Tel: +46 13 22 28 52 Fax: +46 13 12 51 42 email: JohHe@oto.liu.se From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 22 Sep 1995 03:41:09 GMT Organization: The University of Texas at Austin Lines: 28 Message-ID: <43tb8l$jt8@geraldo.cc.utexas.edu> References: <43oll3$gt2@hollywood.cinenet.net> NNTP-Posting-Host: slip-7-2.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <43oll3$gt2@hollywood.cinenet.net>, erc@cinenet.net (Eric Smith) says: > > >How well does the cochlea divide sound into its frequency components? >For example, a 100 dB, 6000 Hz, pure tone, stimulates the hair cells >for 6000 Hz. But does it avoid stimulating any 5000 Hz hair cells at >all, or does it stimulate those with a small fraction of the energy it >applies to the 6000 Hz hair cells? Can anyone supply any kind of >formula for estimating how much stimulation there will be at different >frequencies when a single pure tone is applied? > Our mind has the ability to hear such a loud tone as simply a tone, but when a sound of this magnitude is presented to the cochlea, many auditory nerve fibers on both sides of the tonal frequency are activated. So why do we not perceive this as a complex sound? The brain's 2nd and 3rd order neurons suppress the activity on the sidebands. This is an oversimplied answer to this question, but I would suggest reading Kim and Molnar (1979) J. Neurophysiol. 42:16-30. I think this is the right article... Help from others appreciated... Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: audiology and the internet Date: 22 Sep 1995 03:33:01 GMT Organization: The University of Texas at Austin Lines: 22 Message-ID: <43tapd$jt8@geraldo.cc.utexas.edu> References: <43netk$7ug@mozo.cc.purdue.edu> NNTP-Posting-Host: slip-7-2.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article , boismier@umich.edu (Tom Boismier, MPH) says: > >In article <43netk$7ug@mozo.cc.purdue.edu> dinosawr@expert.cc.purdue.edu writes: > >> I am looking for any information about audiology and the internet or >> audiology and www. Any leads would be helpful. Has anyone seen any >> ‚ articles or read anything about this? Please let me know. Thanks > >David Baguley and I have recently written an article for the British Journal >of Audiology which should be published within the next 2-3 months. Tom, Is there any way you could post a "text" version to the newsgroup? Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: audiology and the internet Date: 22 Sep 1995 03:31:49 GMT Organization: The University of Texas at Austin Lines: 28 Message-ID: <43tan5$jt8@geraldo.cc.utexas.edu> References: <43netk$7ug@mozo.cc.purdue.edu> NNTP-Posting-Host: slip-7-2.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <43netk$7ug@mozo.cc.purdue.edu>, dinosawr@expert.cc.purdue.edu says: > > > I am looking for any information about audiology and the internet or > audiology and www. Any leads would be helpful. Has anyone seen any > ‚ articles or read anything about this? Please let me know. Thanks > > Diana Sowers > Dear Diana, Welcome to the newsgroup.... Glad to see that the Boilmakers are with us... There is a wonderful WWW page designed and maintained by Karen McComas at Marshall University. The address is: http://www.marshall.edu/commdis/audiology/index.html It is a great place to start... Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!UTS.CC.UTEXAS.EDU!sirianni From: sirianni@UTS.CC.UTEXAS.EDU (Jeff Sirianni) Newsgroups: bionet.audiology Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Date: 21 Sep 1995 20:03:19 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 42 Sender: daemon@net.bio.net Distribution: world Message-ID: NNTP-Posting-Host: net.bio.net Date: Mon, 18 Sep 95 11:26:17 -0700 From: Kelley Mascher Subject: Re: presence of otoacoustic emissions in profoundly deaf child (fwd) Hard walled calibration chambers are not at all like ear canals from an emissions point of view. It is really more a matter of matching the acoustic impedance of the ear canal not just the volume. For adults we use a Zwislocki coupler which is partially successfull but no infant version exists. The best solution continues to be to lower the stimulus level and see what happens to the response .Since the emission has a non-linear amplitude response it should decrease significantly less than the decrease in stimulus. If the response is an artifact it will decrease with almost exactly the same as the stimulus. David Kemp has a research system which measures DP and DP latency at the same time. This performs a similar function in that, an artifactual DP has no time delay where a physiologically generated one must. Kelley Mascher (206) 528-2713 Children's Hospital & Med. Center mascher@u.washington.edu Audiology Research In bionet.audiology you write: >To Kelly : If this is the case, would it be practical to test one's equipment >in a calibration chamber (i.e. 2 cc) to see if acoustic DP's arise due to >transducer overload? I understand that in a 16-month old one would want a >smaller chamber... >Thanks go to Allison Scott for bringing up this topic.... >Jeff Sirianni @(((<{ >University of Texas at Austin >Communication Sciences and Disorders >CMA, 2nd Floor Clinic >Austin, TX 78712-1089 >sirianni@uts.cc.utexas.edu >jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!howl.demon.co.uk From: Tony Woolf Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: Fri, 22 Sep 95 09:12:59 GMT Organization: :-) free zone :-( Lines: 70 Message-ID: <811761179snz@howl.demon.co.uk> References: <43oll3$gt2@hollywood.cinenet.net> <43tb8l$jt8@geraldo.cc.utexas.edu> Reply-To: tony@howl.demon.co.uk X-NNTP-Posting-Host: howl.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 In article <43tb8l$jt8@geraldo.cc.utexas.edu> sirianni@uts.cc.utexas.edu "Jeffrey Sirianni" writes: > In article <43oll3$gt2@hollywood.cinenet.net>, erc@cinenet.net (Eric Smith) > says: > > when > a sound of this magnitude is presented to the cochlea, many auditory > nerve fibers on both sides of the tonal frequency are activated. So why > do we not perceive this as a complex sound? The brain's 2nd and 3rd order > neurons suppress the activity on the sidebands. This is an oversimplied > answer to this question, but I would suggest reading Kim and Molnar (1979) > J. Neurophysiol. 42:16-30. I'm not a specialist in this field - I'm an acoustician. However I'm interested and have done some reading, and it's obvious that there's been a great deal of progress since the 1970s. My information comes from a text book "An introduction to the physiology of hearing" (James O. Pickles, Academic Press 1988 ISBN 0-12-554754-4). (This is a very readable general introduction.) Also from various conference sessions and a few discussions with Prof. E.F.Evans of Keele University UK who did some of the experimental work. A lot of this work was done in the early 1980s. Using some very sophisticated measuring techniques, it's been shown, not just that individual hair cell tuning is as sharp as as that of the cochlear nerve fibres, but that the basilar membrane vibration also shows the identical sharp tuning! However this is true only if the subject is in very good physiological shape, which is why the earlier experiments done on cadavers or heavily anaesthetised animals didn't show it. Quote from the UK Institute of Acoustics Bulletin July/August 1994, article by E.F.Evans: "These cochlear nerve filters are quite remarkable: they have half-power bandwidths in the one-third to one-sixth octave range and cut-off slopes of the order of 100-200dB/octave for characteristic frequencies above 2kHz or so, approaching 1000dB/octave on the high frequency cut-offs." (Generally they cut off faster on the high frequency side than the low frequency side.) As I said, the modern belief is that this frequency selectivity (in mammals) arises from the basilar membrane vibration itself. There is a good hypothesis for this which accounts for the known facts although AFAIK the exact mechanism remains unknown. The hypothesis is that there is a positive feedback mechanism which sharpens the tuning. This is what happens when you get a howl-round in a hearing aid or PA system. When the gain is just short of howl-round the sensitivity increases, and frequency selective effects are increased. (Early radio receivers used this under the name of "reaction" or "regeneration" to increase sensitivity and sharpen tuning, but it fell out of use because it was difficult to control.) In the basilar membrane, the feedback mechanism has to be partly mechanical. It is known that the hairs on the outer hair cells change length in step with an applied voltage, and this seems to be the way that a reinforcing vibration is fed back into the basilar membrane. Damage to the outer hair cells stops this effect. This seems to be the main mechanism of loss of hearing caused by excessive noise, at least in the early stages. This explains why the critical bandwidth of the ear usually increases when there is hearing loss related to the cochlea nerves, as stopping the positive feedback both reduces sensitivity and stops the tuning being sharp. -- Tony Woolf (tony@howl.demon.co.uk) From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!nac.no!Norway.EU.net!EU.net!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: BIONET.AUDIOLOGY FAQ Development Date: 22 Sep 1995 12:26:13 GMT Organization: The University of Texas at Austin Lines: 28 Message-ID: <43ua15$6ss@geraldo.cc.utexas.edu> NNTP-Posting-Host: slip-2-12.ots.utexas.edu X-Newsreader: WinVN 0.90.4 Greetings... Well I would first like to thank all of you for the exciting discussion that has been going on the last few weeks. I'm sure there are many people out there who are "readers only" as well as our usual "posters". Keep up the good work... Spread the news... There have been numerous inquiries concerning the develpment of a FAQ document for the newsgroup. I have not heard back from anyone who has gotten a FAQ in shape for regular posting. At this time I am asking for help in getting this going since we have regular postings/inquiries in WWW pages across the internet. If there is anyone out there working on a FAQ document, please lket me ASAP, or anyone who would like to get one going. I think this will be a way of getting newbies up to speed with the newsgroup and other audiology related resources on the internet... TIA for your help. Jeff Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!geraldo.cc.utexas.edu!usenet From: sirianni@uts.cc.utexas.edu (Jeffrey Sirianni) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 22 Sep 1995 22:29:00 GMT Organization: The University of Texas at Austin Lines: 56 Message-ID: <43vdbc$23p@geraldo.cc.utexas.edu> References: <43oll3$gt2@hollywood.cinenet.net> <43tb8l$jt8@geraldo.cc.utexas.edu> <811761179snz@howl.demon.co.uk> NNTP-Posting-Host: slip-2-14.ots.utexas.edu X-Newsreader: WinVN 0.90.4 In article <811761179snz@howl.demon.co.uk>, Tony Woolf says: > >In article <43tb8l$jt8@geraldo.cc.utexas.edu> > sirianni@uts.cc.utexas.edu "Jeffrey Sirianni" writes: >> a sound of this magnitude is presented to the cochlea, many auditory >> nerve fibers on both sides of the tonal frequency are activated. So why >> do we not perceive this as a complex sound? The brain's 2nd and 3rd order >> neurons suppress the activity on the sidebands. This is an oversimplied >> answer to this question, but I would suggest reading Kim and Molnar (1979) >> J. Neurophysiol. 42:16-30. {SNIP} >Using some very sophisticated measuring techniques, it's been shown, >not just that individual hair cell tuning is as sharp as as that of the >cochlear nerve fibres, but that the basilar membrane vibration also >shows the identical sharp tuning! However this is true only if the >subject is in very good physiological shape, which is why the earlier >experiments done on cadavers or heavily anaesthetised animals didn't >show it. > {SNIP} >Tony Woolf (tony@howl.demon.co.uk) Fine tuning takes place at low intensity levels. I hope you did not misunderstand my explanation. At low intensities, only those outer & inner hair cells, plus auditory nerve fibers, with a characteristic frequency (CF) of the presented tone will respond. That is what fine tuning is all about. At high intensity levels, many of these cells will respond, but those with a CF of the presented frequency will respond at a larger magnitude. If you look on a tuning curve, you will notice that there is some response at frequencies on the "sidebands" of CF. Look at a study that deals with population studies of auditory neurons. You will see that an identical high intensity stimulus at a constant frequency (say 1000 Hz) will excite many auditory nerve fibers on both sides of 1000 Hz. The response for cells with a CF of 1000 Hz will be greatest and will decline on the sidebands. but there is a considerable amount of response measured in an increase in driven rate. (Sorry to SNIP, but my newsgroup reader likes responses longer than the quoted portion... A way of curving the "Me Too !" syndrome) Jeff Jeff Sirianni @(((<{ University of Texas at Austin Communication Sciences and Disorders CMA, 2nd Floor Clinic Austin, TX 78712-1089 sirianni@uts.cc.utexas.edu jgsaudio@aol.com From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!MAGNUS.ACS.OHIO-STATE.EDU!smorelan From: smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) Newsgroups: bionet.audiology Subject: Re: ENG Date: 22 Sep 1995 15:40:38 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 21 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509222238.SAA22101@beauty.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net >Just a couple of questions today. > >1. Are there any great web pages related to vestibular function and >pathology? SNIP >Thanks! >Amy S. Bannerman > > yes, there are! i don't have the names or addresses of them, but i did a lycos search and unearthed several. if you don't have web searching capabilites i'd be happy to do another search and obtain the addresses of the sites for you. susan we stroll together silently, just the two of us -- my wolf and me... From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!MAGNUS.ACS.OHIO-STATE.EDU!smorelan From: smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) Newsgroups: bionet.audiology Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: 22 Sep 1995 15:38:23 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 33 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509222235.SAA26446@bottom.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net >To: tony@howl.demon.co.uk >From: smorelan@magnus.acs.ohio-state.edu (susan moreland) >Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) >Cc: >Bcc: >X-Attachments: > > >SNIP > >>Worse filtering seems (usually but not always) an early indicator >>of damage or malfunction of the hair cells. This can and does happen >>in very narrow frequency bands. I'm not sure what the practical >>effect is, on a conventional audiogram, but this damage in narrow >>bands is apparently undetectable by the subject in normal life. > SNIP >>Tony Woolf (tony@howl.demon.co.uk) a widening of critical bands is often experienced by the person as reduced speech discrimination in noise. as the bands expand, it becomes more and more likely that the noise will mask the signal. there's a fairly lengthy explanation behind that phenomeonon and it was, in fact, another of my comps questions. geez, will i ever escape them? ;) susan we stroll together silently, just the two of us -- my wolf and me... From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!HUEY.CSUN.EDU!hbcsc202 From: hbcsc202@HUEY.CSUN.EDU (evelyn sowles) Newsgroups: bionet.audiology Subject: SRT Testing Date: 22 Sep 1995 14:05:07 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 9 Sender: daemon@net.bio.net Distribution: world Message-ID: NNTP-Posting-Host: net.bio.net I have heard about different approaches to the SRT test. Some do an up 5 and down 10 method and present one word at each level until the patient correctly repeats a spondee 3 times at the same level. Some other people use the up 5 and down 10 method, but present 4 words at each level and record the threshold that the patient gets at least 50 percent of the words correct. Which is done most often and/or which one is more correct? From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!cs.utexas.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: asbfun@aol.com (ASB FUN) Newsgroups: bionet.audiology Subject: ENG Date: 22 Sep 1995 16:08:59 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 12 Sender: root@newsbf02.news.aol.com Message-ID: <43v54r$akf@newsbf02.news.aol.com> Reply-To: asbfun@aol.com (ASB FUN) NNTP-Posting-Host: newsbf02.mail.aol.com Just a couple of questions today. 1. Are there any great web pages related to vestibular function and pathology? 2. Who out there administers ENG regularly and who is really comfortable performing the Hallpike Maneuver with elderly patients? I am considering eliminating this test from the ENG battery for many of my patients. If you have any great tips on Hallpike, let me know. Thanks! Amy S. Bannerman From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!howl.demon.co.uk From: Tony Woolf Newsgroups: bionet.audiology Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: Fri, 22 Sep 95 18:57:50 GMT Organization: :-) free zone :-( Lines: 43 Message-ID: <811796270snz@howl.demon.co.uk> References: <43oll3$gt2@hollywood.cinenet.net> <43s97f$1a9@hollywood.cinenet.net> Reply-To: tony@howl.demon.co.uk X-NNTP-Posting-Host: howl.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 In article <43s97f$1a9@hollywood.cinenet.net> erc@cinenet.net "Eric Smith" writes: > Thanks for all the answers (and references) to my question about the > quality of filtering in the cochlea, both here and by email. The > general consensus seems to be that the quality of filtering is not very > high. I regret to say that, according to my information, the general consensus seems to be out of date - see my post in the appropriate thread. Will anyone who wishes to contradict this, please give *modern* references. > My next question is about the implications of this in cases where the > hair cells are defective at some frequencies but not others. It seems > like the person would still hear tones of those frequencies, but they > would sound like other frequencies, and would have a higher threshold. > But an audiogram does not ask what the tones sound like, just whether > they can be heard at all. Thus, some people who are actually 100% deaf > at some frequencies but have normal hearing at others, might have a > very misleading audiogram. Worse filtering seems (usually but not always) an early indicator of damage or malfunction of the hair cells. This can and does happen in very narrow frequency bands. I'm not sure what the practical effect is, on a conventional audiogram, but this damage in narrow bands is apparently undetectable by the subject in normal life. Poor filtering is also an effect of TTS and lasts considerably longer than the change in hearing threshold. Exposure to noise prior to an audiogram can therefore affect the filtering several weeks after the noise occurred. The worsened filtering can be detected by special techniques. For example, you can use noise with a notch of variable width to mask a tone at the notch centre frequency. I must emphasise that this is based on what I have read and on conversations, not on practical experience. It does seem to be pretty solid information and I can give plenty more references. -- Tony Woolf (tony@howl.demon.co.uk) From owner-audiology@net.bio.net Thu Sep 21 23:00:00 1995 Path: biosci!LEX.LCCC.EDU!rcb1 From: rcb1@LEX.LCCC.EDU (Ron Blue) Newsgroups: bionet.audiology Subject: Fowarded: aspartame a real danger? Date: 22 Sep 1995 05:40:04 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 255 Sender: daemon@net.bio.net Distribution: world Message-ID: References: <43sgpg$cv4@agate.berkeley.edu> NNTP-Posting-Host: net.bio.net From betty@pd.org Fri Sep 22 07:57:28 1995 Date: Thu, 21 Sep 1995 14:50:10 -0400 (EDT) From: Betty Martini To: Ron Blue Subject: Re: Tinnitus FAQ Pointer (fwd) Betty Martini Domain: betty@pd.org UUCP: ...!emory!pd.org!betty ---------- Forwarded message ---------- Date: Wed, 20 Sep 1995 14:57:00 -0400 From: Betty Martini Newgroups: alt.support.tinnitus, alt.rock-n-roll.hard, alt.sci.physics.acoustics, misc.health.alternative, rec.audio.misc, rec.audio.pro, rec.music.makers, rec.music.misc, sci.med, sci.med.dentistry, sci.med.nutrition Subject: Re: Tinnitus FAQ Pointer I'm replying to several inquiries I've had about aspartame and tinnitus, including this one, because of a previous post I did explaining that aspartame triggers tinnitus. Now that didn't mean that aspartame is the only cause, of course, it simply meant that we see it frequently. Aspartame use to be in 300 products, and then 600 products, but now the patent has expired and it is now in 5000 products and climbing! Some people really live a nightmare with this problem, and are very happy to learn of this trigger because when it is from aspartame it vanishes as soon as the toxin is eliminated. Also, even if the tinnitus was from another source, it might not be easy to treat if the patient was not warned that a product they were using that triggers it by itself will aggravate the problem. And lastly, nobody should use this anyway because it is a chemical poison. It is not even a diet product. It says in the Congressional Record, S5511, May 7, 1985, the following: "Aspartame has been demonstrated to inhibit the carbohydrate-induced synthesis of the neurotransmitter serotonin (Wurtman affidavit). Serotonin blunts the sensation of craving carbohydrates and thus is part of the body's feedback system that helps limit consumption of carbohydrate to appropriate levels. Its inhibition by aspartame could lead to the anomalous result of a diet product causing increased consumption of carbohydrates." Translation: Use "diet" products sweetened with aspartame and get fat! Aspartame was discovered by a Searle chemist testing a peptic ulcer drug, and it was intended to be a "drug". It is not a food additive; consider possible reactions when mixed with other drugs. It was kept off the market for 16 years because it caused brain tumors and grand mal seizures in lab animals, and thats what it is doing to the population now - and thats just for starters. The FDA admits to 92 documented symptoms from coma to death. Diabetics who it is pushed on should be warned it has the component of methanol (wood alcohol) and this is a severe metabolic poison disastrous to the health of a diabetic, and the other components are just as dangerous. In my last post I quoted two books that link aspartame to tinnitus, and said that most people who research and write about aspartame know it triggers tinnitus. I picked up a new book yesterday called NEW CHOICES IN NATURAL HEALING EDITED BY Bill Gottlieb, Editor-in-Chief, Prevention Magazine Health Books. I happen to look up NutraSweet in this book last night just to see if it was listed and here is what it says: Page 45 "Perhaps even more significant is the possible danger of many common food additives. Aspartame, the artificial sweetener sold as NutraSweet and Equal, can cause headaches and migraines, rashes, ringing ears, depression, insomnia and loss of motor control, according to a study by the Food and Drug Administration." I'm calling attention to his remark about "ringing ears". It is a known fact that aspartame triggers tinnitus, as well as other ear problems. This book has a copyright date of 1995 by Rodale Press. After my post I got a few inquiries that wanted more information, and requested references to double-blind studies. I should warn you that the studies funded by Searle (Monsanto bought Searle in l985) are flawed and, in my opinion, useless. Dr. Arthur Hull Hayes, head of the FDA, over-ruled his own board of inquiry that said not to approve aspartame and went to work for Searle's PR firm and refused to speak to the press for 10 years. It was requested that U.S. Attorney Sam Skinner indict Searle because of these flawed studies (like rats being resurrected on paper after they were declared dead!) but instead he went to work for Searle's law firm defending the case as did the U.S. Attorney after him. The statute of limitations gave out and Searle got away with putting a poison, even though its a sweet poison, in the marketplace. Since many in this newsgroup insisted on medical documentation I notified Dr. H. J. Roberts who is considered the world expert on aspartame. He has written books on the subject and many publications that were published in peer review journals. He is a Board-certified practicing internist and an internationally known medical consultant and researcher. He is listed in Who's Who in America, Who's Who in The World, Who's Who in Science and Engineering, and The Best Doctors in the U.S. He is on the Active Staff of Good Samaritan Hospital and St. Mary's Hospital (West Palm Beach), Director of the Palm Beach Institute for Medical Research (since l964) and a member of many prestigious medical and scientific organizations - including the Endocrine Society and the American Academy of Neurology. He has authored nine acclaimed books, three being nominated for a Pulitzer Prize. I requested that Dr. Roberts write a report on aspartame and tinnitus and he most graciously forwarded me the attached, in the hope that it would warn those with tinnitus, as well as others, of the danger of using aspartame. We hope you will copy it and warn others with this problem. PROFESSIONAL OPINION OF H. J. ROBERTS, M.D., F.A.C.P., F.C.C.P. CONCERNING THE USE OF PRODUCTS CONTAINING ASPARTAME (NUTRASWEET@) BY PERSONS WITH EAR AND EQUILIBRIUM PROBLEMS It is my opinion that individuals who consume products containing aspartame, including drugs and supplements, should avoid them when no specific cause can be found for these symptoms: *"Ringing" or "buzzing" of the ears (tinnitus) ... some- times described as hissing humming or whistling *Marked intolerance to noise *Impairment or loss of hearing *Marked unsteadiness or dizziness The same precaution is reasonable for persons in whom these complaints are due to other disorders because they could be aggravated by aspartame, even in minimal amounts. These corporate-neutral suggestions are based on considerable observation, research and correspondence published in more than a score of articles and two books: * ASPARTAME (NUTRASWEET@): IS IT SAFE? (Philadelphia, The Charles Press) * SWEET'NER DEAREST: BITTERSWEET VIGNETTES ABOUT ASPARTAME (NUTRASWEET@) (West Palm Beach, Sunshine Sentinel Press, P. O. Box 17799: 1 800-814-9800: Fax 407-832-2400) I also have reviewed these and related problems in my two-cassette talk, IS ASPARTAME (NUTRASWEET@) SAFE? A MEDICAL, PUBLIC HEALTH AND LEGAL OVERVIEW --1995 (Sunshine Sentinel Press). These represent hard - won insights in the trenches of a medical practice. Patients and consumers should not be misled by the "negative" conclusions of flawed studies sponsored by vested interests. There is no bias or malice intended against any company, distributor, researcher or professional who may hold contrary views. THE ROLE OF ASPARTAME Each of these components of aspartame -- phenylalanine; aspartic acid; the methyl ester, which promptly becomes methyl alcohol or methanol -- and their multiple breakdown products after exposure to heat or during prolonged storage is potentially toxic to the brain and inner ear. These organs are uniquely vulnerable to metabolic disturbances and neurotoxins because of their unique metabolic requirements. REPRESENTATIVE CASE REPORT A 30-year-old woman drank five or more cups or glasses of aspartame beverages daily for 17 months. She experienced ringing and pain in both ears, dizziness, a severe headache, and considerable loss of hearing in the left ear by audio- metric studies. When brain tumor was ruled out by CT scans, otology and neurology consultants made the diagnosis of Meniere's disease. The patient deduced that the aspartame drinks were responsible because she could predictably reproduce these symptoms on rechallenge with them. A N O V E R V I E W In my publications, and in testimony to Congress and an FDA advisory group. I have expressed the belief that the current wholesale ingestion of aspartame products by over half the adult population constitutes a probable "imminent public health hazard." My concern is bolstered by (1) evidence that these products may play a causative or aggravating role in many other medical disorders (including headaches, dizziness, confusion, impaired vision, convulsions, and probably brain tumors), (2) the flawed nature of most "scientific" studies being used to prove the alleged safety of these products, and (3) reports of serious reactions volunteered to the FDA by over 7,300 irate consumers. In the present context, these statistics are pertinent. *In my earlier report on 551 aspartame reactors (the data base is now much larger), dizziness was a major problem in 217 (39%), tinnitus in 73 (13%), severe intolerance for noise in 47, and marked impairment in hearing in 25. *The FDA (as of August 1995) had received complaints about dizziness and problems with balance from 737 consumers, and a change in hearing from 36. *The American Tinnitus Association found that the cause of tinnitus in 18,000 suffers was unknown in one-third. These complications tend to be magnified in persons with unrecognized hypothyroidism (underactive thyroid), hypoglycemia (low blood sugar reactions), diabetes, hypertension, reactions to MSG, treatment with aspirin and other drugs that can irritate the auditory nerves, and problems associated with aging. They become compounded by the threat of falls and driving accidents. I welcome reports of such reactions, and results of the "no aspartame test", for our independent registry. A 9 page survey questionnaire can be obtained by calling (407) 832-2408, or fax 407 832-2400. I have also expressed concern that aspartame products might be accelerating Alzheimer's disease. The details appear in my just-published book, DEFENSE AGAINST ALZHEIMER'S DISEASE: A RATIONAL BLUEPRINT FOR PREVENTION (Sunshine Sentinel Press - address listed above). H. J. Roberts, M.D., F.A.C.P., F.C.C.P. @1995 I might add that we have Dr. Roberts' form by email. We also ask that you send us your case history as well and the FDA because they state that only 1% actually report serious problems. And even with them not accepting some complaints and referring others to the Aids Hotline, there were still 10,000 complaints on their April, 1995 report, almost 80% of all reports to the FDA on additives. This is a very serious problem folks. Dr. Roberts did not mention what the breakdown products are but methanol converts to formaldehyde and then formic acid (ant sting poison) causing metabolic acidosis. The phenylalanine breaks down to DKP (a brain tumor agent). So unless you are looking for free embalming I would not consume aspartame in any form. You cannot heat aspartame because of these breakdown products, but the FDA forgot they have mentioned this in the past and have now approved it for baked goods, and many times aspartame is contained in baked foods in the bakery of your local grocer as well restaurant food. Pharmacists are complaining about it being in drugs from cholesterol lowering drugs to antibiotics and many times cause the very problem the drug is suppose to cure. Be careful. The soda pop companies sent diet pop to the troops in the Persian Gulf and they sat 8 weeks in the 120 degree Arabian sun. If you want to review my report on Desert Storm Syndrome and receive other information on aspartame including the history and case histories from the auto-responder please email me for information. And please warn others. Betty Martini Operation Mission Possible Betty Martini Domain: betty@pd.org UUCP: ...!emory!pd.org!betty  From owner-audiology@net.bio.net Fri Sep 22 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!howland.reston.ans.net!agate!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!news.netins.net!usenet From: HearWHAC@netins.net (HearWHAC) Newsgroups: bionet.audiology Subject: Re: Cochlea -- quality of filtering Date: 23 Sep 1995 06:31:02 GMT Organization: INS Info Services, Des Moines, IA, USA Lines: 12 Message-ID: <4409j6$ojb@insosf1.netins.net> References: <43oll3$gt2@hollywood.cinenet.net> <43tb8l$jt8@geraldo.cc.utexas.edu> <811761179snz@howl.demon.co.uk> NNTP-Posting-Host: s3135.netins.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 Tony Woolf (tony@howl.demon.co.uk) Will you (or anyone else on this news group) be attending the Hearing Aid Conference in Hamburg, Germany, next month? It will be the 40th anniversary of this conference. I have wanted to attend for many years - and am finally going to do it. Anything I should know about it? Suggestions? Thank you. Paul Woodard Des Moines Iowa USA HearWHAC@netins.net From owner-audiology@net.bio.net Fri Sep 22 23:00:00 1995 Path: biosci!LEX.LCCC.EDU!rcb1 From: rcb1@LEX.LCCC.EDU (Ron Blue) Newsgroups: bionet.audiology Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: 23 Sep 1995 08:47:43 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 12 Sender: daemon@net.bio.net Distribution: world Message-ID: References: <199509222235.SAA26446@bottom.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net On 22 Sep 1995, susan moreland wrote: > a widening of critical bands is often experienced by the person as reduced > speech discrimination in noise. as the bands expand, it becomes more and > more likely that the noise will mask the signal. there's a fairly lengthy > explanation behind that phenomeonon and it was, in fact, another of my comps > questions. Noise had been view as a double edge sword. Reducing perception and increasing perception. Neuro firing are assumed to generate noise, but the noise can be used to amplify a weak signal. How does increase in width in bands change the advantage created by noise for signal detection in your opinion? Ron Blue From owner-audiology@net.bio.net Fri Sep 22 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!news.sprintlink.net!in2.uu.net!news1.digital.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.ucalgary.ca!babymac.ear.ucalgary.ca!user From: dbrown@haircell.ear.ucalgary.ca (David K. Brown) Newsgroups: bionet.audiology Subject: Re: ENG Date: Sat, 23 Sep 1995 12:56:57 -0700 Organization: Hearing Research Lab, University of Calgary Lines: 30 Distribution: world Message-ID: References: <199509222238.SAA22101@beauty.magnus.acs.ohio-state.edu> NNTP-Posting-Host: @babymac.ear.ucalgary.ca In article <199509222238.SAA22101@beauty.magnus.acs.ohio-state.edu>, smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) wrote: > >Just a couple of questions today. > > > >1. Are there any great web pages related to vestibular function and > >pathology? > > > SNIP > > >Thanks! > >Amy S. Bannerman > > > > > yes, there are! SNIP > susan > >You can start with the web page at John's Hopkins and surf from their suggestions. http://www.bme.jhu.edu/labs/chb/index.html Enjoy! David Brown Hearing Research Lab University of Calgary From owner-audiology@net.bio.net Fri Sep 22 23:00:00 1995 Path: biosci!MAGNUS.ACS.OHIO-STATE.EDU!smorelan From: smorelan@MAGNUS.ACS.OHIO-STATE.EDU (susan moreland) Newsgroups: bionet.audiology Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: 23 Sep 1995 09:53:18 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 49 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509231650.MAA23196@beauty.magnus.acs.ohio-state.edu> NNTP-Posting-Host: net.bio.net >On 22 Sep 1995, susan moreland wrote: >> a widening of critical bands is often experienced by the person as reduced >> speech discrimination in noise. as the bands expand, it becomes more and >> more likely that the noise will mask the signal. there's a fairly lengthy >> explanation behind that phenomeonon and it was, in fact, another of my comps >> questions. >Noise had been view as a double edge sword. Reducing perception and >increasing perception. Neuro firing are assumed to generate noise, but >the noise can be used to amplify a weak signal. How does increase in >width in bands change the advantage created by noise for signal detection >in your opinion? Ron Blue > The most important point is that there exists an internal auditory bandpass filter that can be centered ideally at the signal frequency. This filter reflects peripheral activity on the basilar membrane, independent of central mechanisms. The filter, via resonance, removes the noise at frequencies below fl and above fu outside the filter and passes any signal between fu and fl. Signals that are enveloped by two different critical bands will be perceived as being two separate signals, but signals that are close to each other (in the same critical band) can not be distinguished from each other. Therefore, the critical band is offered as the basis for our ability to discriminate between different frequencies. Critical bands are the reason why we enjoy the degree of frequency selectivity that we do. When outer hair cells are damaged due to aging or other causes, there occurs not only a loss of sensitivity, but also selectivity. This happens most often in the basal parts of the cochlea so the resulting selectivity problems are usually visible in the higher frequencies, at least in the beginning. When the hair cells are destroyed in a particular location, the critical bands in that area widen. The narrower a filter is, the better the frequency resolution, so if the filters become abnormally large the listener will have reduced capacity to distinguish one sound from another if the two sounds are relatively close together in frequency. In turn, this affects the person's ability to understand speech (the signal) in the presence of noise (the masker). Specifically, according to Sommers and Humes (1993), increased filter widths are "hypothesized to decrease the signal-to-noise ratio at the output of the auditory filters and therefore make identification of speech signals more difficult." > susan we stroll together silently, just the two of us -- my wolf and me... From owner-audiology@net.bio.net Sat Sep 23 23:00:00 1995 Path: biosci!daresbury!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: bjparker@aol.com (BJPARKER) Newsgroups: bionet.audiology Subject: Re: Audiogram defects (was Re: Cochlea -- quality of filtering) Date: 24 Sep 1995 01:04:29 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 22 Sender: root@newsbf02.news.aol.com Message-ID: <442ost$evk@newsbf02.news.aol.com> References: <199509231650.MAA23196@beauty.magnus.acs.ohio-state.edu> Reply-To: bjparker@aol.com (BJPARKER) NNTP-Posting-Host: newsbf02.mail.aol.com All the discussion about "critical bands" is great, but let's not forget it is only a theory - a model of the auditory system. It is a good way to describe many characteristics of auditory processing but it is in no way complete. The work by Kolarauch (' 90s) in off-frequency hearing is a perfect example of where critical band theory fails. There is also a great article by Hall and Grose (JSHR, late 80's) showing the way we have measured frequency selectivity effects our estimates. Also, if you include binaural processing there are many other factors to consider. A study by Parker (1991) and another by Parker and Small (submitted JSHR) show that, in the older population, although word recognition may be decreased, binaural frequency selectivity stays equal to that of young listeners (hearing level was a controled factor). I think it was a great question posed to the group - and a good follow-up question. Current data suggests the auditory system is capable of high tuning or frequency selectivity - what we need to answer now is which mechanisims are essential for that tuning and what role does the central system play?!?!? Just dropping in my 2 cents ... Barbara From owner-audiology@net.bio.net Sat Sep 23 23:00:00 1995 Path: biosci!SCONCEPT.COM!admin From: admin@SCONCEPT.COM Newsgroups: bionet.audiology Subject: Info Request: History of Dictograph Products Corp? Date: 23 Sep 1995 17:56:45 -0700 Organization: BIOSCI International Newsgroups for Molecular Biology Lines: 58 Sender: daemon@net.bio.net Distribution: world Message-ID: <199509240054.TAA26433@icicle> NNTP-Posting-Host: net.bio.net One of our users from The Netherlands has asked me to post this for him. (I edited the translation, and got approval for this version.) Christine Tlougan admin@sconcept.com Hearing Exchange Online http://www.sconcept.com/hearing.html --------------------------------------------------------------------------- Hello! Acousticon Audiciens is in the process of putting together a special edition book about the 75 year history of our company. However, we don't have much information about our parent company, Dictograph Products Inc., or their products. If you have any information about the origins of the Acousticon hearing aid, or about Dictograph Products Inc., we would appreciate hearing from you. (Addresses are at the bottom of the page.) What we have so far: __________________________________________________________________________ Dictograph Products Corporation (aka Dictograph Products Inc.) Dictograph Products Corporation (DPC) existed in America by early 1900. Until World War II, DPC was an important producer and supplier of hearing aids in Europe under the trade name "Acousticon". These hearing aids also were sold under license around the world. Along with hearing aids, DPC also produced dictographs (home telephone installations) and radio products. In Europe, several companies such as Oticon in Denmark, and A&M in England, spun off from DPC. In the Netherlands, Acousticon is now an organization of 20 shops specializing in hearing aids. One of the things we know about DPC's past is that Queen Alexandra wore an