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Re: Bite-induced pitch shift?

I sometimes see this in tmj patients.  In fact, I sometimes have this
experience myself when my tmj is being particularly bothersome.


Tom Brennan KD5VIJ, CCC-A/SLP R/D - AU
web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html

On Thu, 19 Jun 2003, Bob Masta wrote:

> Date: Thu, 19 Jun 2003 15:45:27 -0400
> From: Bob Masta <masta@UMICH.EDU>
> Subject: Bite-induced pitch shift?
> Dear List:
> In the June 9 issue of  Electronic Design <www.elecdesign.com>
> analog electronics guru Bob Pease mentions that when he bites down
> hard "on some tough nuts or a popcorn cake, the pitch seems to
> dip momentarily by about half a note".
> Has anyone heard of a phenomenon like this?  (The effect doesn't
> seem to work for me, at least not when biting down on a plastic
> toothbrush handle.)  He wonders what can cause this.  If this is
> truly a pitch shift and not a resonance envelope (formant) shift
> due to distorting the ear canal, could it be deforming the cochlea
> such that the stiffness of the basilar membrane is changed?
> Seems pretty extreme!  Any ideas?
> Robert Masta
> tech@daqarta.com
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