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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>That’s nifty Stephen, <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>So we potentially have at least two sorts of motion that the haircells can detect: motion of the fluid in the channel and motion of the cochlea itself. How do the cells tell the difference. And why a spiral. Could somebody write an abm of a pressure wave churning down a spiral. For some reason this is ll reminding me of standing on the observation platform in Carmel where the sea otters come to play and watching the kelp wave in the surf. Except with the cochea, the rocks on which the kelp is attached are also moving with the surf and the surf is in a spiral channel, constantly being deflected to the right. . <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>n<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nick Thompson<o:p></o:p></p><p class=MsoNormal><a href="mailto:ThompNickSon2@gmail.com"><span style='color:#0563C1'>ThompNickSon2@gmail.com</span></a><o:p></o:p></p><p class=MsoNormal><a href="https://wordpress.clarku.edu/nthompson/"><span style='color:#0563C1'>https://wordpress.clarku.edu/nthompson/</span></a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Friam <friam-bounces@redfish.com> <b>On Behalf Of </b>Stephen Guerin<br><b>Sent:</b> Monday, February 8, 2021 4:16 PM<br><b>To:</b> The Friday Morning Applied Complexity Coffee Group <friam@redfish.com><br><b>Cc:</b> Boozer Daly <shizame@sbcglobal.net><br><b>Subject:</b> Re: [FRIAM] what complexity science says ...<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Mon, Feb 8, 2021 at 11:22 AM <<a href="mailto:thompnickson2@gmail.com">thompnickson2@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=gmail-m-1287594704098237539msoplaintext>Clearly the diagram is non-sense, right? It depicts amplitude but claims to provide frequency or wave length data. But both of the latter require differential “representation”, right. Moreover, the depiction of the cochlea as flat and “unrolled” is one of those “assume-a-spherical-cow” things. Cows aren’t spherical and cochlea aren’t flat AND they ARE cooped up in a bony spiral. How does that distort the wave as it sloshes around the spiral, constantly turning right? And what about back waves arising from the pulsing of the lower window? <o:p></o:p></p></div></div></blockquote><div><p class=MsoNormal style='margin-bottom:12.0pt'>Yes, it was flattened out. Here's more of the spiral look with the lower frequencies picked up further into the apex:<br><br><br><br><img border=0 width=562 height=315 style='width:5.8541in;height:3.2847in' id="Picture_x0020_1" src="cid:image002.png@01D6FE61.B48D72E0"><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>One model is that the stereocilia "hair cells" are of different lengths along the basilar membrane and resonate to different frequencies in the pressure wave.<o:p></o:p></p></div><div><p class=MsoNormal><br><b><span style='color:#0B5394'>Nick initially wrote:</span></b><o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal><b><span style='color:#0B5394'> As usual I overstated the case. But the cochlea IS a piece of meat, not a gang of oscillators</span></b>. <o:p></o:p></p></blockquote><p class=MsoNormal><br>My initial response was to counter that "This meat does have oscillators"<br><br> the hair cells along the basal membrane are the oscillators (think spring model) that transduces the frequency of the linear momentum to electrical. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><br><img border=0 width=300 height=300 style='width:3.125in;height:3.125in' id="Picture_x0020_2" src="cid:image003.png@01D6FE60.44470970"><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><img border=0 width=242 height=562 style='width:2.5208in;height:5.8541in' id="Picture_x0020_3" src="cid:image005.png@01D6FE61.B48D72E0"><img border=0 width=553 height=391 style='width:5.7569in;height:4.0763in' id="Picture_x0020_4" src="cid:image007.png@01D6FE61.B48D72E0"><br><br><br><o:p></o:p></p><div><p class=MsoNormal>(As an aside, I would guess the opposite direction where the transduction goes from electrical signal to oscillating hair movement is probably the dual in something like the cilia of a paramecium if the calcium gradient is reversed.)<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></div></body></html>