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Manual versus speech motor control and the evolution of language

Published online by Cambridge University Press:  04 February 2010

Philip Lieberman
Affiliation:
Department of Cognitive and Linguistic Sciences, Brown University, Providence, Rl 02912-1978. lieberman@browncog.bitnet

Abstract

Inferences made from endocasts of fossil skulls cannot provide information on the function of particular neocortical areas or the subcortical pathways to prefrontal cortex that form part of the neural substrate for speech, syntax, and certain aspects of cognition. The neural bases of syntax cannot be disassociated from “communication.” Manual motor control was probably a preadaptive factor in the evolution of humansyntactic ability, but neurophysiological data on living humans show that speech motor control and syntax are more closely linked. The evolution of fully modern speech occurred fairly recently; though Homo habilis may have had some degree of speech and syntactic ability, it was not fully modern. Stone tools are uncertain indices of language or cognition.

Information

Type
Open Peer Commentary
Copyright
Copyright © Cambridge University Press 1995

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