HARRY R. ERWIN herwin at mason1.gmu.edu
Thu Apr 21 15:15:19 EST 1994

Has anyone considered how neocortex evolved? I've heard that it probably
came from paleocortex, but paleocortex is characterized by afferent
sensory input arriving at Layer 1, while neocortex receives its input
via the thalamus in layer 4. The pyramidal cells appear to be organized
similarly in both, but neocortex has 6 layers while paleo has 3. If neo
came from paleo, how did it lose its layer 1 inputs? Has anyone tried to
do a cladistic analysis of the tetrapod brain????

Harry Erwin
Internet: herwin at gmu.edu 
Working on Katchalsky nets.... and recovering from getting screwed by

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