[FRIAM] what complexity science says ...

[thompnickson2 at gmail.com]

That’s nifty Stephen, 

 

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.  . 

 

n

 

Nick Thompson

 <mailto:ThompNickSon2 at gmail.com> ThompNickSon2 at gmail.com

 <https://wordpress.clarku.edu/nthompson/> https://wordpress.clarku.edu/nthompson/

 

From: Friam <friam-bounces at redfish.com> On Behalf Of Stephen Guerin
Sent: Monday, February 8, 2021 4:16 PM
To: The Friday Morning Applied Complexity Coffee Group <friam at redfish.com>
Cc: Boozer Daly <shizame at sbcglobal.net>
Subject: Re: [FRIAM] what complexity science says ...

 

 

 

On Mon, Feb 8, 2021 at 11:22 AM <thompnickson2 at gmail.com <mailto:thompnickson2 at gmail.com> > wrote:

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? 

Yes, it was flattened out. Here's more of the spiral look with the lower frequencies picked up further into the apex:





 

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.


Nick initially wrote:

 As usual I overstated the case.  But the cochlea IS a piece of meat, not a gang of oscillators.  


My initial response was to counter that "This meat does have oscillators"

 the hair cells along the basal membrane are the oscillators (think spring model) that transduces the frequency of the linear momentum to electrical. 




 






(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.)

 

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