Re: Rationale for Critical Bands (Ximing Li )


Subject: Re: Rationale for Critical Bands
From:    Ximing Li  <xl285608@xxxxxxxx>
Date:    Mon, 14 Jun 2010 10:31:38 -0400
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

--00c09f905dacfb639f0488fe5992 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Dan and Martin, Thanks a lot for the question and explanation! Ximing On 14 June 2010 09:12, Martin Braun <nombraun@xxxxxxxx> wrote: > Dear Dan, and list, > > You are quite right. The level independence of the critical bandwidths (C= B) > over wide sound level ranges excludes an origin in the cochlea. > > There are compelling data indicating that the origin is in the central > nucleus of the inferior colliculus (ICC). > > http://www.ncbi.nlm.nih.gov/pubmed/3975613 > > http://www.ncbi.nlm.nih.gov/pubmed/7677631 > > http://www.ncbi.nlm.nih.gov/pubmed/9237756 > > http://www.ncbi.nlm.nih.gov/pubmed/10190753 > > http://www.ncbi.nlm.nih.gov/pubmed/10867285 > > Enjoy, > > Martin > > > --------------------------------------------------------------------- > Martin Braun > Neuroscience of Music > S-671 95 Kl=E4ssbol > Sweden > email: nombraun@xxxxxxxx > web site: http://www.neuroscience-of-music.se/index.htm > > > > > > ----- Original Message ----- From: "Daniel Bowling" < > danielliubowling@xxxxxxxx> > To: <AUDITORY@xxxxxxxx> > Sent: Monday, June 14, 2010 3:46 AM > Subject: Rationale for Critical Bands > > > > Dear List, >> >> Has anyone considered why humans exhibit critical bands in >> psycho-acoustical >> experiments (e.g. masking, loudness summation, detectability of phase >> changes)? Is the assumption that the origin of critical bands is in the >> physiology of the cochlea? If so, how is this justified? If critical ban= ds >> result from overlap/interference of vibrations on the basilar membrane o= ne >> would expect their bandwidths to change significantly at different sound >> pressure levels (because more auditory nerve afferents over longer >> portions >> of the cochlea are activated by higher SPLs, and fewer afferents within >> restricted areas of the cochlea are activated by lower SPLs), but this >> does >> not seem to be the case. >> >> In vision, attempts to rationalize psychophysical phenomena in terms of >> retinal physiology have had very limited success. >> >> Any thoughts would be much appreciated. >> >> Thanks, >> >> Dan >> >> --=20 Ximing --00c09f905dacfb639f0488fe5992 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable <div>Hi Dan and Martin,=A0</div><div><br></div>Thanks a lot for the questio= n and=A0explanation!=A0<div><br></div><div>Ximing<br><br><div class=3D"gmai= l_quote">On 14 June 2010 09:12, Martin Braun <span dir=3D"ltr">&lt;<a href= =3D"mailto:nombraun@xxxxxxxx">nombraun@xxxxxxxx</a>&gt;</span> wrote:<br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex;">Dear Dan, and list,<br> <br> You are quite right. The level independence of the critical bandwidths (CB)= over wide sound level ranges excludes an origin in the cochlea.<br> <br> There are compelling data indicating that the origin is in the central nucl= eus of the inferior colliculus (ICC).<br> <br> <a href=3D"http://www.ncbi.nlm.nih.gov/pubmed/3975613" target=3D"_blank">ht= tp://www.ncbi.nlm.nih.gov/pubmed/3975613</a><br> <br> <a href=3D"http://www.ncbi.nlm.nih.gov/pubmed/7677631" target=3D"_blank">ht= tp://www.ncbi.nlm.nih.gov/pubmed/7677631</a><br> <br> <a href=3D"http://www.ncbi.nlm.nih.gov/pubmed/9237756" target=3D"_blank">ht= tp://www.ncbi.nlm.nih.gov/pubmed/9237756</a><br> <br> <a href=3D"http://www.ncbi.nlm.nih.gov/pubmed/10190753" target=3D"_blank">h= ttp://www.ncbi.nlm.nih.gov/pubmed/10190753</a><br> <br> <a href=3D"http://www.ncbi.nlm.nih.gov/pubmed/10867285" target=3D"_blank">h= ttp://www.ncbi.nlm.nih.gov/pubmed/10867285</a><br> <br> Enjoy,<br> <br> Martin<br> <br> <br> ---------------------------------------------------------------------<br> Martin Braun<br> Neuroscience of Music<br> S-671 95 Kl=E4ssbol<br> Sweden<br> email: <a href=3D"mailto:nombraun@xxxxxxxx" target=3D"_blank">nombraun@xxxxxxxx= ia.com</a><br> web site: <a href=3D"http://www.neuroscience-of-music.se/index.htm" target= =3D"_blank">http://www.neuroscience-of-music.se/index.htm</a><br> <br> <br> <br> <br> <br> ----- Original Message ----- From: &quot;Daniel Bowling&quot; &lt;<a href= =3D"mailto:danielliubowling@xxxxxxxx" target=3D"_blank">danielliubowling@xxxxxxxx= MAIL.COM</a>&gt;<br> To: &lt;<a href=3D"mailto:AUDITORY@xxxxxxxx" target=3D"_blank">AUDIT= ORY@xxxxxxxx</a>&gt;<br> Sent: Monday, June 14, 2010 3:46 AM<br> Subject: Rationale for Critical Bands<div><div></div><div class=3D"h5"><br> <br> <br> <blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p= x #ccc solid;padding-left:1ex"> Dear List,<br> <br> Has anyone considered why humans exhibit critical bands in psycho-acoustica= l<br> experiments (e.g. masking, loudness summation, detectability of phase<br> changes)? Is the assumption that the origin of critical bands is in the<br> physiology of the cochlea? If so, how is this justified? If critical bands<= br> result from overlap/interference of vibrations on the basilar membrane one<= br> would expect their bandwidths to change significantly at different sound<br= > pressure levels (because more auditory nerve afferents over longer portions= <br> of the cochlea are activated by higher SPLs, and fewer afferents within<br> restricted areas of the cochlea are activated by lower SPLs), but this does= <br> not seem to be the case.<br> <br> In vision, attempts to rationalize psychophysical phenomena in terms of<br> retinal physiology have had very limited success.<br> <br> Any thoughts would be much appreciated.<br> <br> Thanks,<br> <br> Dan<br> <br> </blockquote> </div></div></blockquote></div><br><br clear=3D"all"><br>-- <br>Ximing <br> </div> --00c09f905dacfb639f0488fe5992--


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