Re: comparing cochlear models ? ("reinifrosch@xxxxxxxx" )


Subject: Re: comparing cochlear models ?
From:    "reinifrosch@xxxxxxxx"  <reinifrosch@xxxxxxxx>
Date:    Sun, 23 May 2010 11:12:26 +0000
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

------=_Part_490_11122946.1274613146158 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hello Emad, Today I would like to add something to my answer sent two days ago; I am se= nding this to the whole List because I hope that it may be of interest to c= ochlear modelers. Last October I presented my own cochlear model to the ann= ual meeting of the Canadian Acoustical Association in Niagara-on-the Lake; = see R. F., "Old and New Cochlear Maps", Canadian Acoustics Vol. 37 No. 3 (2= 009) 174-175. That model involves two cochlear resonators, namely the "IOCR= " [internal organ-of-Corti resonator; springs =3D outer hair cells (OHCs) a= nd surrounding structures] and the "BMR" (basilar-membrane resonator; sprin= gs =3D fibres of the BM). At given distance-from-base in the basal half, th= e resonance frequency of the local IOCR is lower, by about one octave, than= that of the local BMR. During a sine-tone, the IOCR enables the OHCs to "a= ctively" feed energy into the travelling wave, to thus give rise to the "ac= tive" excitation peak (prominent at low sound level), and to make the real = (i.e., resistive) part of the low-sound-level BM impedance negative. That m= odel has been found to be adequate by showing that it is consistent with fi= ve experimental sine-tone functions of distance-from-base, namely (1) the l= ow-level BM oscillation velocity, (2) the high-level (or any-level post-mor= tem) BM oscillation velocity, (3) the corresponding BM-oscillation phase (w= hich depends weakly only on level), (4) the real part of the BM impedance, = and (5) the imaginary part of the BM impedance. The experimental data are b= riefly described in my above-mentioned paper.=20 Reinhart. =20 ----Urspr=C3=BCngliche Nachricht---------------------- Von: emad.burke@xxxxxxxx Datum: 23.05.2010 04:18 An: <reinifrosch@xxxxxxxx> Betreff: Re: comparing cochlear models ? Dear Reinhart, Thanks a lot for the reference and I appreciate all the other usefull comme= nts too. Best Emad. On Fri, May 21, 2010 at 8:14 PM, reinifrosch@xxxxxxxx<reinifrosch@xxxxxxxx= .ch> wrote: Hello Emad, I like the cochlear model of Paul Kolston, described in his paper "The impo= rtance of phase data and model dimensionality to cochlear mechanics", Hear.= Res. 145 (2000) 25-36. In his Fig. 8, Kolston proves that his model is goo= d by showing that it correctly predicts two experimental functions of dista= nce-from-base: 1) the BM velocity at given sine-tone frequency, and 2) the = corresponding phase. The agreement of such theoretical curves with experime= ntal data can be quantified by chi-squared, i.e. by the sum of=20 [(f_theo-f_exper)/df_exper]^2, taken over all experimental values of the fu= nction f_exper; df_exper is the experimental uncertainty of f_exper. With best wishes, Reinhart. =20 ----Urspr=C3=BCngliche Nachricht------------------------- Von: emad.burke@xxxxxxxx Datum: 21.05.2010 18:57 An: <AUDITORY@xxxxxxxx> Betreff: Re: comparing cochlear models ? ----------------------------------------------------------------- Reinhart Frosch, Dr. phil. nat., r. PSI and ETH Zurich, Sommerhaldenstr. 5B, CH-5200 Brugg. Phone: 0041 56 441 77 72. Mobile: 0041 79 754 30 32. E-mail: reinifrosch@xxxxxxxx . ------=_Part_490_11122946.1274613146158 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'> <!-- div.bwmail { background-color:#ffffff; font-family: Trebuchet MS,Arial,Helv= etica; font-size: 12px; margin:0; padding:0;} div.bwmail p { margin:0; padding:0; } div.bwmail table { font-family: Trebuchet MS,Arial,Helvetica; font-size: 12= px; } div.bwmail li { margin:0; padding:0; } --> </style> </head><body><div class=3D'bwmail'><P>Hello Emad,</P> <P>Today I would like to add something to my answer sent two days ago; I am= sending this to the whole List because I hope that it may be of interest t= o cochlear modelers. Last October I presented my own cochlear model to the = annual meeting of the Canadian Acoustical Association in Niagara-on-the Lak= e; see R. F., "Old and New Cochlear Maps", Canadian Acoustics Vol. 37 No. 3= (2009) 174-175. That model involves two cochlear resonators, namely the "I= OCR" [internal organ-of-Corti resonator; springs =3D outer hair cells (OHCs= ) and surrounding structures] and the "BMR" (basilar-membrane resonator; sp= rings =3D fibres of the BM). At&nbsp;given distance-from-base in the basal = half, the resonance frequency of the local IOCR is lower, by about one octa= ve, than that of the local BMR. During a sine-tone, the IOCR enables the OH= Cs to "actively" feed energy into the travelling wave, to thus give rise to= the "active" excitation peak (prominent at low sound level), and to make t= he real (i.e., resistive) part of the low-sound-level BM impedance negative= . That model has been found to be adequate&nbsp;by showing that it is consi= stent&nbsp;with five experimental sine-tone functions of distance-from-base= , namely (1) the low-level BM oscillation velocity, (2) the high-level (or = any-level post-mortem) BM oscillation velocity, (3) the corresponding BM-os= cillation phase&nbsp;(which depends weakly only on level),&nbsp;(4) the rea= l part of the BM impedance,&nbsp;and (5) the imaginary part of the BM imped= ance. The experimental data are briefly described in my above-mentioned pap= er.&nbsp;<BR>Reinhart.</P> <P>&nbsp;</P> <P>----Urspr=C3=BCngliche Nachricht----------------------<BR>Von: emad.burk= e@xxxxxxxx<BR>Datum: 23.05.2010 04:18<BR>An: &lt;reinifrosch@xxxxxxxx&gt= ;<BR>Betreff: Re: comparing cochlear models ?<BR><BR>Dear Reinhart,<BR>Than= ks a lot for the reference and I appreciate all the other usefull comments = too.<BR>Best<BR>Emad.<BR><BR></P> <DIV class=3Dgmail_quote>On Fri, May 21, 2010 at 8:14 PM, <A href=3D"mailto= :reinifrosch@xxxxxxxx">reinifrosch@xxxxxxxx</A><SPAN dir=3Dltr>&lt;<A h= ref=3D"mailto:reinifrosch@xxxxxxxx">reinifrosch@xxxxxxxx</A>&gt;</SPAN>= wrote:<BR> <BLOCKQUOTE class=3Dgmail_quote style=3D"PADDING-LEFT: 1ex; MARGIN: 0pt 0pt= 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid"> <DIV> <DIV> <P>Hello Emad,</P> <P>I like the cochlear model of Paul Kolston, described in his paper "The i= mportance of phase data and model dimensionality to cochlear mechanics", He= ar. Res. 145 (2000) 25-36. In his Fig. 8, Kolston proves that his model is = good by showing that it correctly predicts two experimental functions of di= stance-from-base: 1) the BM velocity at given sine-tone frequency, and 2) t= he corresponding phase. The agreement of such theoretical curves with exper= imental data can be quantified&nbsp;by chi-squared, i.e. by the sum of </P> <P>[(f_theo-f_exper)/df_exper]^2, taken over all experimental values of the= function f_exper; df_exper is the experimental uncertainty of f_exper.</P> <P>With best wishes,</P> <P>Reinhart.<BR></P> <P>&nbsp;</P> <P>----Urspr=C3=BCngliche Nachricht-------------------------<BR>Von: <A hre= f=3D"mailto:emad.burke@xxxxxxxx" target=3D_blank>emad.burke@xxxxxxxx</A><= BR>Datum: 21.05.2010 18:57<BR>An: &lt;<A href=3D"mailto:AUDITORY@xxxxxxxx= LL.CA" target=3D_blank>AUDITORY@xxxxxxxx</A>&gt;<BR>Betreff: Re: com= paring cochlear models ?</P> <DIV class=3Dim>-----------------------------------------------------------= ------</DIV> <DIV class=3Dim>Reinhart Frosch,<BR>Dr. phil. nat.,<BR>r. PSI and ETH Zuric= h,<BR>Sommerhaldenstr. 5B,<BR>CH-5200 Brugg.<BR>Phone: 0041 56 441 77 72.<B= R>Mobile: 0041 79 754 30 32.<BR>E-mail: reinifrosch@xxxxxxxx .<BR></DIV><= /DIV></DIV></BLOCKQUOTE></DIV></div></body></html> ------=_Part_490_11122946.1274613146158--


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