Richard Norman wrote:
>> "George Hammond" <ghammond at mediaone.net> wrote in message
> news:3B00D9EE.9B6CC68A at mediaone.net...> > maxwell wrote:
> > snip
> >
> > > Well, yes, I did as much. I'll note that your earlier
> > > mention of the probable phylogenic constraints,
> > > that resulted in decussations, consistent with current
> > > ontogenic molecular findings, are another
> > > pleasant spot of actual science amidst the folderol.
> > > ...Which apparently evoked no further interest, alas.
> >
> > [Hammond]
> > Is it plausible that decussation originated in
> > the fact that a lens "reverses" it's image, and the
> > easiest way to correct this unwanted optical circumstance
> > would be to simply "reverse" the wiring somewhere else
> > in the system. To wit: do animals without eye lenses normally
> > exhibit a major decussation in the CNS, or is this
> > reserved only for animals with lenses?
>> Maybe it sounds plausible, but unfortunately there is no
> validity to it. Nothing in the nervous "cares" whether the
> image is inverted or reversed or upside down or whatever.
> The mapping of the visual field to the cortex is highly
> distorted over a highly folded surface. Still we see "up"
> and "down". Besides, the auditory system and the
> somatosensory systems, not to mention the motor
> systems, are also decussated.
[Hammond]
Obviously an implausible answer. At some point, with
the development of the "lens", animal vision suddenly
became "reversed"... the animal must have spent ages
crashing into things and turning the wrong way, until
finally a mutant arrived which had crossed wiring, and
could see straight. Naturally he decimated the rest
of the backwards population, got all the girls, and
that was the origin of ducussation in the CNS.
--
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George Hammond, M.S. Physics
Email: ghammond at mediaone.net
Website: http://people.ne.mediaone.net/ghammond/index.html
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