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February 1952

NOTES ON CORTICAL EVOLUTION

Author Affiliations

CHICAGO

From the Department of Anatomy, University of Illinois School of Medicine.

AMA Arch NeurPsych. 1952;67(2):135-144. doi:10.1001/archneurpsyc.1952.02320140003001
Abstract

A COMPLETE account of the phylogenesis of the cerebral cortex is clearly far beyond what can be achieved in the short time that is at my disposal. It would, moreover, hardly be germane to the main topic of this symposium, the relation of brain and mind. But to point to some of the structural and functional changes which took place in the evolution of the primates is eminently suitable as a "curtain raiser."

To write the story of the evolution of the primate brain, as T. Edinger1 did for the horse, is, in fact, not possible at present, since we have far too few fossil records. We can compare only living forms, and the limitations inherent in this procedure are obvious.2 We know that primate brains of about the same size differ but little from each other, regardless of the genus to which its bearer belongs. Thus, Cebus

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