learning no pain

Ron Blue rcb5 at MSN.COM
Sun Jun 7 10:59:38 EST 1998

The latest supporting evidence was a small article in either Science or
Nature within the last six months that you can interfer with the internal
representation of the position of the arm through learning within a short
period of time.

The orginal research was done by Ramachandran within the last two years.
I do not remember the source.

Also related to this topic is the following article:
Craig, A.D. & Bushnell, M.C. (1994, July 8).  The Thermal Grill
Illusion: Unmasking the Burn of Cold Pain. Science v265, p252(4).
Ron Blue
-----Original Message-----
From: F. Frank LeFever <flefever at ix.netcom.com>
To: neur-sci at net.bio.net <neur-sci at net.bio.net>
Date: Sunday, June 07, 1998 1:42 AM
Subject: Re: learning no pain

>You continue to amaze me.  I dimly recall the paradigm you describe
>(and some related work), but my "source memory" is so impaired (frontal
>lobe decline in old age?) that I'm not sure where/when; do know I first
>heard of something like this from member of the audience at a NY
>Academy of Sciences evening meeting 2-3 yrs ago, but THINK I read
>something relevant to this a year or so later...
>As I recall (but who knows from where or when) the phenomena were
>interesting enough and the implications important enough to desrve
>wider attention.
>In <094c83553140668UPIMSSMTPUSR01 at email.msn.com> rcb5 at MSN.COM ("Ron
>Blue") writes:
>>>I have read that some types of chronic pain can persist long
>>>after there is no clear indication for it. It seems the body can
>>>"learn" pain if given enough time to associate with it. Could the
>>>below snip also explain this?
>>>Ed Ergenzinger wrote in message <35741D3E.90C81D67 at bgsm.edu>...
>>>>  In the somatosensory system perceptual anomalies such as
>>>>phantom limb have been linked to reorganizational changes
>>>>injury.  The association between phantom sensation and
>>>>central maps would seem to indicate that while neurons can
>>>acquire new receptive fields and become activated by input from
>>>new portions of the body surface, the result of this activity is
>>>interpreted as coming from old portions of the body surface.
>>Pain is a discrepant signal on two or more channels that are
>>incongruent.   Therefore pain can be learned, but it can also
>>be removed by learning.
>>Consider the case of a person with phantom limb pain
>>who puts his good left arm on a table and his stub of
>>his right arm on a table behind a mirror.  By carefully
>>positioning the mirror so that it looks like the left arm is
>>the right arm in the mirror some interesting events can
>>be set up.
>>Now both hands are moved together for 15 minutes
>>but your visual attention is on the mirror right hand.
>>((This effect can be created in normal people for hand displacement.))
>>When the mirror is taken away the pain is significantly reduced.
>>The last message into the brain is that the right arm is OK and the
>>movements occured over a wide range of behaviors.
>>The no pain state is now registered.
>>Ron Blue

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