In article <4l3g00$el4 at vixen.cso.uiuc.edu>, Kevin Spencer (kspencer at s.psych.uiuc.edu) writes:
>Emery Carr <ecarr at infohwy.com> writes:
>>>I don't know if this is the right newsgroup... so steer me in the right
>>direction if you can...
>>>I'm searching for information about how to use binaural beats to entrain
>>brainwave frequencies.
>>Check out the literature on "steady-state evoked responses". I think
>that's what you're looking for.
>>>The only info. I have found so far is that 200hz and 210hz will cause a
>>frequency following response of 4hz in the brain.
>>Hmm, never heard of that one before.
>>Kevin
>-----------------------------------------------------------
>Kevin Spencer
>Cognitive Psychophysiology Laboratory and Beckman Institute
>University of Illinois at Urbana-Champaign
>kspencer at p300.cpl.uiuc.edu / kspencer at psych.uiuc.edu>-----------------------------------------------------------
>>Reply to: gord at homostudy.win-uk.net
The problem here seems from this corner to be largely the result of
too narrow specialisation in the teaching (and learning!) of
neuroscience. In fact from a wider view it is quite simple when we
consider the "wiring" of auditory circuits - in this case the role
of discrepancy detectors in determining the *source* of a sound.
Note that superficially this might seem to have little or nothing
to do with Emery Carr's question, but it is the cause of the
observed EEG phenomenon.
Consider the wave-forms below:
A: single frequency.
l____l____l____l____l____l____l____l____l____l____l L AC
_l____l____l____l____l____l____l____l____l____l___ R AC
ll ll ll ll ll ll ll ll ll Discrepancy
/ \
L R
B: two frequencies
l____l____l____l____l____l____l____l____l____l____l L AC
l___l___l___l___l___l___l___l___l___l___l___l___l__ R AC
nil ll l_l_l ll nil ll l_l_l ll nil ll Discrepancy
AC - Auditory Channel read by EEG
Note: The *beat* frequency appearing on the EEG is that which comes
from the discrepancy detectors
In the language of computer engineers the discrepancy
detectors correspond to a NAND (Not AND) circuit, lateral inhibition
to NOR (Not OR).
Cheers Gord
