Subject: Re: BM motion From: Matt Flax <flatmax@xxxxxxxx> Date: Wed, 14 Nov 2007 14:49:00 +1100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Hi, 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 ? Matt [1] @xxxxxxxx{geisler:1990, author = {Geisler, CD and Yates, GK and Patuzzi, RB and Johnstone, BM}, title = {{Saturation of outer hair cell receptor currents causes two-tone suppression.}}, 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 > USA -- ,dPYb,,dPYb, I8 IP'`YbIP'`Yb I8 http://www.flatmaxstudios.com/ I8 8II8 8I 88888888 http://www.flatmax.org I8 8'I8 8' I8 I8 dP I8 dP ,gggg,gg I8 ,ggg,,ggg,,ggg, ,gggg,gg ,gg, ,gg I8dP I8dP dP" "Y8I I8 ,8" "8P" "8P" "8, dP" "Y8I d8""8b,dP" I8P I8P i8' ,8I ,I8, I8 8I 8I 8I i8' ,8I dP ,88" ,d8b,_,d8b,_,d8, ,d8b,d88b,dP 8I 8I Yb,d8, ,d8b,dP ,dP"Y8, PI8"888P'"Y8P"Y8888P"`Y8P""Y8P' 8I 8I `YP"Y8888P"`Y8" dP" "Y8 I8 `8, I8 `8, I8 8I Public Projects : I8 8I http://sourceforge.net/search/?type_of_search=soft&words=mffm I8, ,8' http://www.psysound.org "Y8P'