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Re: BM motion


I believe that two-tone suppression will affect both tones.
If they are similar in magnitude you will also see distortion products.

In 1990 Geisler [1] suggested that the nonlinearity was a function of 
the hair cell saturation. Personally I agree with him.

The method in which this nonlinearity is applied is still a mystery 
(in the published literature) ... 
As an example I bring up the 'frequency specificity' mystery.
We can imagine - using travelling wave theory - that a low freq. tone 
affects a high freq. tone ... but we also notice that a high frequency 
tone affects a low frequency tone. How ?


[1] @ARTICLE{geisler:1990,
  author = {Geisler, CD and Yates, GK and Patuzzi, RB and Johnstone, 
  title = {{Saturation of outer hair cell receptor currents causes 
  journal = {Hearing Research},
  year = {1990},
  volume = {44},
  pages = {241--56},
  number = {2-3}

On Tue, Nov 13, 2007 at 09:55:31PM -0500, Fred Herzfeld wrote:
> Can I get some help with BM motion.
> The concept of the traveling wave on the BM has been well documented. Now 
> suppose I sit on the BM at a frequency CFm greater than a particular CF. 
> Let the input at the stapes be F1 with a magnitude of A1. I get an output 
> (deflection) at CFm say Def1. If I change the magnitude from A1 to 2*A1 I 
> get an output Def2. Because of the non-linearity the ratio of the outputs 
> is not linearly related to the ratio of the inputs. But suppose the second 
> input is at another frequency say F2 and I adjust its input magnitude so 
> that the deflection at CFm is the same as for the F1 case and in addition. 
> The first case is as if I had two identical inputs at the stapes. In the 
> second case I have two different frequencies at the input each of which 
> gives individually the same deflection.
> Can I assume that the non linear effects will be the same so that as far as 
> the measurements at CFm  are concerned I cannot tell the difference between 
> the two cases ??
> My conclusion is that I cannot tell the difference!!
> Fred
> -- 
> Fred Herzfeld, MIT '54
> 78 Glynn Marsh Drive #59
> Brunswick, Ga.31525

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