Re: Cochlea Amplifier models : a new list

["Richard F. Lyon" <DickLyon@xxxxxxx>]

At 2:54 PM +0200 10/10/07, Martin Braun wrote:
> 2) At high sound levels:
> Here BM tuning is shifted by about half an octave towards the base 
> of the cochlea, whereas neural tuning remains unchanged.

I haven't been able to find the evidence for the assertion that 
neural tuning remains unchanged in some way that differs from the 
sense in which BM tuning remains unchanged; in the BM case, the 
location of the maximum moves toward the base; it might be hard to 
assess the location of the peak of the neural response, since the 
respond rate is pretty compressed near the location of maximum, but 
is there data on that?  My impression was that it does not differ in 
any significant way from BM tuning; assessing the tuning by phase 
response is much easier (e.g., spacing of waveform peaks and PSTH 
peaks in response to a click, or waveform autocorr peaks and revcor 
peaks in response to a noise).  These do change just a bit with 
level, in close agreement with TW models that include appropriate 
nonlinearities, e.g. as shown in Kiang's original click data of 1965 
and everything subsequently.

Where should I look to study the data on this idea that underlies 
your modeling approach?

Dick