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<div class="moz-cite-prefix">I'm not clear on your (EricS's) age
(childhood) but I have a full bound collection of SciAm which
might date back that far I'd love to find someone to take over
from me... I already tried unloading them on Zingale but he ducked
that bullet.</div>
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<div class="moz-cite-prefix">Any takers? Old paper and dust?<br>
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> Eric writes<br>
>
When I was a kid, there was some article (maybe Sci. Am.?)
that I found wonderful.<br>
<br>
Bilateral Symmetry may apply to in magazines too :-) Here's
a 1973 article in "American Scientist" instead of
"Scientific American" :-)<br>
<br>
<a
href="https://www.americanscientist.org/article/how-the-owl-tracks-its-prey"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.americanscientist.org/article/how-the-owl-tracks-its-prey</a><br>
from the article:<br>
Asymmetrical placement of the ears (one higher than the
other) allows the owl to determine both the azimuth
(horizontal direction) and elevation (vertical direction) of
sounds.<br>
<br>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Jul 14, 2025 at
2:33 PM Santafe <<a href="mailto:desmith@santafe.edu"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">desmith@santafe.edu</a>>
wrote:</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
> On Jul 15, 2025, at 2:41, glen <<a
href="mailto:gepropella@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">gepropella@gmail.com</a>>
wrote:<br>
> <br>
> 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. <br>
<br>
When I was a kid, there was some article (maybe Sci. Am.?)
that I found wonderful.<br>
<br>
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.<br>
<br>
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).<br>
<br>
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.<br>
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