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The Speciation of Modern Homo Sapiens$
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T. J. Crow

Print publication date: 2004

Print ISBN-13: 9780197263112

Published to British Academy Scholarship Online: January 2012

DOI: 10.5871/bacad/9780197263112.001.0001

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When did Directional Asymmetry Enter the Record?

When did Directional Asymmetry Enter the Record?

(p.153) When did Directional Asymmetry Enter the Record?
The Speciation of Modern Homo Sapiens

James Steele

British Academy

This chapter reviews evidence for the evolution of primate asymmetries in brain morphology and in behaviour, including the fossil and archaeological record of human evolution. This evidence suggests that, while morphological asymmetries are conserved features of the human brain, human functional asymmetries are derived, at least in their degree and consistency. The discussion offers a partial explanation that takes account of allometric scaling in the evolution of brain size, neocortex size, and intra- and interhemispheric connectivity.

Keywords:   primate asymmetry, brain morphology, human evolution, allometric scaling, neocortex size

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