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Audiogram defects (was Re: Cochlea -- quality of filtering)

Ron Blue rcb1 at LEX.LCCC.EDU
Mon Sep 25 08:49:44 EST 1995


On 24 Sep 1995, BJPARKER wrote:
> Susan wrote: 
> actually, that's not quite true.  one of the beauties of the critical band
> theory is that it *does* address the shape and size of the filters.
> fletcher, in his original theory, assumed they were symmetrical, but did
> not
> know for sure.  when patterson and moore created psychophysical tuning
> curves they were asymmetrical, so patterson controlled for off-freq
> listening by using notched noise.  when he did that, it forced the
> subjects
> to listen to the filter centered on fs and the bands were shown to be
> symmetrical.
As a guess how would the following relate as an explaination.
Assume hearing is a stocahastic resonnance of a zero sum or
flat line resultant over all band widths.  For any observation
data looks chaotic but it is totally deterministic.

Visualize a wave machine made two sheets of flat glass, colored
water, and oil on top of the water.

The total wave length possible is the width of the glass.
The sum of all wave patterns for the oil and water is zero or
a flat line.  At any particular location on the wave machine
(i.e. neuro activity in the cochlea) the activity looks chaotic
but can be causually linked to the viberation on the wave
machine.  Stranglely when you move away from the oscillation
location deceased activity is noticed, and increased in 
activity in noticed in areas that should not be related to
the orginal location.

If you backup and look at the wave machine
the connect in now obvious.  
Ron Blue




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