left-right reversal of CNS: Why?
kenneth paul collins
KPCollins at postoffice.worldnet.att.net
Fri Sep 6 04:00:33 EST 1996
>What do you mean by "Topologically distributed"
Somewhat like "topographically-distributed", but also incorporating
twists and turns and crossings and fiber termination density
gradients... all of which enter into the formation of
>and what by "Excitation/Inhibition ratio"?
I'm sorry... that's as simple as I can make it... it's somewhat like the
algebraic summation that occurs, say, in the dendritic tree of a single
neuron... only whole "areas"... such as nuclear groups... and their
projection sites... etc. are taken into consideration...
>What, exactly, do you mean by "TD E/I minimization".
such refers to the convergence upon minimally-activated "states"... of
all the activations pertaining to all motions that your right arm could
manifest, for instance, one activation "state" that imparts one
particular motion to your right arm... with all the other possible
activation "states" being inhibited, relatively... it's simple...
without TD E/I minimization, one's behavioral manifestations would be
something like "catatonic"... everything activated all at once...
doesn't work... and the less of such all-at-once-stuff, the better...
>How are these things measured and quantified?
quite arduously... :-)
when I did it, 2 decades ago, I just ransacked the Neuroscience
stacks... worked mostly with single-electrode experimental results...
>It would seem that the lowest possible E/I(min) could be
>acheived by shutting off excitation completely. For some reason, that
>doesn't sound like its going to explain how the brain works.
well, nervous systems incorporate stochastic input generators (R.F. &c)
that inject "randomness" into ongoing activation "states"... such
randomness is then "whittled" down to TD E/I(min) "states"... voila...
one's right arm does what's useful rather than the myriad other things
it could do...
>Since you've been posting these terms a lot, could you please give a
>paragraph explaining them, rather than asking everybody to go to a
I put together an intro doc... it's in the NYTimes "Quantum Paradoxes"
forum... it communicates the bare necessities... ken collins
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