left-right reversal of CNS: Why?
kenneth paul collins
KPCollins at postoffice.worldnet.att.net
Thu Sep 5 00:02:39 EST 1996
> Cajal put forward a very plausible explanation based on the
> fact that images on the retina are left/right inverted.
> Without the visual and motor decussations it would need peculiar
> and complicated circuitry to make a movement of one side of the
> body that related to something in the ipsilateral visual field.
> See his "Recollections of my Life" for a concise explanation
> with diagrams.
Cajal was right, but he didn't carry the idea to fruition... the
information-processing problems that are addressed by all of the twists
and turn that exist within the neuroanatomy are much-more-generalized
than hand-eye coordination... although such is included...
The very essence of "cognition" derives from the way that the twists and
turns allign activation states with respect to TD E/I minimization...
the CNS "merely" "strives" to achieve TD E/I(min), and everything else
is automatically sorted out as a by-product of the degree to which TD
E/I(min) is, in fact, achieved... language, cognition, affect, pain and
its avoidance... everything is "just" TD E/I minimization...
>>Specifically, do any invertebrates show the reversal?
> Yes. This is cited in support of the withdrawal-from-harmful-contacy
> theory. See Sarnat & Netsky: Evolution of the Nervous system.
Do you know when this work was done? ken collins
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