model (David John SMith )


Subject: model
From:    David John SMith  <smithd@xxxxxxxx>
Date:    Wed, 3 Mar 2010 23:35:20 -0500
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

----------MB_8CC896B3B731CB9_1020_D943_web-mmc-d07.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="us-ascii" Such an amazing variety!?=20 Chambers and tubes with water driven hard enough to create standing waves! Wow! Look, I can drive a string with sound and change the response by changing= the tension on the string. It works, but that does not make it a good model for the ear. Here is a link to a nice simple video.? This is what the ear looks like. This is what a model should look like. http://hcd2.bupa.co.uk/fact_sheets/html/Tinnitus.html You may notice that amplification is achieved by the eardrum and ossicles. Gee, is there anyone who has evidence of resonance, as opposed to a freque= ncy selective=20 geometry, in the cochlea??? The coiled cone shape create a low Q cavity,= right?=20 That's the point of the shape, no?? Resonance?? I don't think so. If you unroll the cochlea, you get a cone. Make a small clear cone, perhaps similar to the actual size of the cochlea= . Line the inside of the cone with a very soft gel, seeded with small partic= les, perhaps graphite. The small particles are movement indicators. Put the thing on an overhead projector and speak into it.=20 Note - the sound goes into the large diameter end. You should see the indicators move with some frequency selectivity... Dave Smith ----------MB_8CC896B3B731CB9_1020_D943_web-mmc-d07.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" <div style=3D"font-family: arial; color: black; font-size: 10pt;">Such an= amazing variety!&nbsp; <br> Chambers and tubes with water driven hard enough to create standing waves!= <br> Wow!<br> <br> Look, I can drive a string with sound and change the response by changing= the tension on the string.<br> It works, but that does not make it a good model for the ear.<br> <br> Here is a link to a nice simple video.&nbsp; This is what the ear looks li= ke.<br> This is what a model should look like.<br> <br> http://hcd2.bupa.co.uk/fact_sheets/html/Tinnitus.html<br> <br> You may notice that amplification is achieved by the eardrum and ossicles.= <br> Gee, is there anyone who has evidence of resonance, as opposed to a freque= ncy selective <br> geometry, in the cochlea?&nbsp;&nbsp; The coiled cone shape create a low= Q cavity, right? <br> That's the point of the shape, no?&nbsp; Resonance?&nbsp; I don't think so= .<br> <br> If you unroll the cochlea, you get a cone.<br> Make a small clear cone, perhaps similar to the actual size of the cochlea= .<br> Line the inside of the cone with a very soft gel, seeded with small partic= les, perhaps graphite.<br> The small particles are movement indicators.<br> Put the thing on an overhead projector and speak into it. <br> Note - the sound goes into the large diameter end.<br> You should see the indicators move with some frequency selectivity...<br> <br> Dave Smith<br> <br> <br> <br> </div> ----------MB_8CC896B3B731CB9_1020_D943_web-mmc-d07.sysops.aol.com--


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