left-right reversal of CNS: Why?

kenneth paul collins KPCollins at postoffice.worldnet.att.net
Mon Sep 9 16:58:06 EST 1996


>I read somewhere that, with the visual fields and somatic pathways
>switched like that, you could think of it as though you had a system
>with ipsilateral representation, and twisted the top of it around 180º
>to face backwards.  

...that's bogus... the visual cortex is at the back of the head so 
because having it there maintains the global allignment (which also 
includes many other exceedingly-powerful, and beautiful, features 
that I've not mentioned in this discussion...

>I still have no idea why that's better than ipsi representation, or 
>whether it's just an accident in evolutionary history.

...given the competitiveness of Life, the crossed representation is as 
if =must= be... ipsilateral architecture simply cannot compete... K. P. 
Collins



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