[FRIAM] bilateria

[glen]

Great point, parallax in something like synthetic or inferential pseudo-dimensions. And it speaks directly to the variation in structure and processing just in front of and just behind the sensors.

Similar to owl hearing, I've heard octopuses dedicate ~70% of brain tissue to vision and we dedicate ~30%. But our eyes have higher receptor density, color vision, and depth perception. Plus the more integrated V2-6 processing goes kinda deep into our brain, if I understand correctly. Both up- (feathers, eye spacing, etc.) and down-stream (whole lobes vs. deep integration) processing should be part of any composition from objective stuff like light or sound to obtuse stuff like thoughts or behaviors. If McGilchrist weren't so heavily relying on the left-/right-brain metaphor, there are plenty of abductive targets to go for in things like the built environment, information overload, dopamine release, meritocracy, grifting, etc.

E.g. The decoding the gurus guys interviewed the authors of this paper recently:

Is Visual Perception WEIRD? The Müller-Lyer Illusion and the Cultural Byproduct Hypothesis
https://perception.jhu.edu/files/PDFs/25_MullerLyer/AmirFirestone_MullerLyer_2025_PsychReview.pdf

I haven't read the paper, yet. But the opportunities for variation (or the lack thereof) are plentiful. And it just seems preemptive to focus so hard on bicameral brains.

On 7/14/25 1:33 PM, Santafe wrote:
> 
> 
>> On Jul 15, 2025, at 2:41, glen <gepropella at gmail.com> wrote:
>>
>> Now, I'm sensitive to the argument that all this falls under parallax, even radially symmetric body types and the 9 octopus ganglia. And bi- vision, hearing, etc. is a simple form of parallax: triangulation.
> 
> When I was a kid, there was some article (maybe Sci. Am.?) that I found wonderful.
> 
> It had to do with owl ear asymmetries, which are produced by tufts of stiff feathers at unequal positions in front of whatever feather-hood (or something) channels sound to the ear canals.
> 
> Upshot of the articles was that owls need resolution in the vertical as well as the horizontal, from phase, intensity, and packet-arrival-time differences (including what acousticians term the “head-shaped transfer function”, as I learned some decades later working among the acousticians for a few years).
> 
> Article claimed (I have no way to check without a dive to see what has been done since) that owls and people have about the same acuity in lateral position of a sound’s origin, if the sound has enough shape (so, not a clarinet) to cue from.  But people have terrible vertical acuity.  For owls, the vertical acuity is ballpark-comparable to the lateral.

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