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Cortical Architectures

Harry Erwin erwin at trwacs.fp.trw.com
Sat Mar 5 17:28:31 EST 1994

In article <IV001.94Mar5115912 at ipinocio.nibh.go.jp>,
>Concerning the cortex, does anybody know the evolutionary advantage of
>the increased (200,000 instead of 80,000 neur/mm2) density in the 
>visual cortex of monkeys and humans?
There are two reasons that might be the case here, based on having done
some simulation:

1. Decreased transmission latencies and decreased variance in transmission
latencies. This could be important if the autoassociator in that region
was particularly sensitive to how closely topological the reafferent
signal was. By increasing the packing density, the variation of the
reafferent signal would be minimized.
2. Increased number of pyramidal neurons competing to respond to the array
of afferent signals arriving within the 'shadow' of a specific GABAergic
(inhibitory) interneuron. This would increase the complexity of the
features that could be distinguished within that 'shadow.'
Harry Erwin
Internet: herwin at gmu.edu or erwin at trwacs.fp.trw.com
Working on Katchalsky networks....

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