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The pattern of evolution in Pleistocene human brain size

Published online by Cambridge University Press:  08 April 2016

Sang-Hee Lee  and
Milford H. Wolpoff
Sang-Hee Lee
Affiliation:
Department of Anthropology, University of California at Riverside, Riverside, California 92521-0418. E-mail: [email protected]
Milford H. Wolpoff
Affiliation:
Paleoanthropology Laboratory, Department of Anthropology, University of Michigan, Ann Arbor, Michigan 48109-1382. E-mail: [email protected]
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Abstract

With a sample of 94 Pleistocene cranial capacities between the time period of 1.8 Ma and 50 Ka now known, we consider the evolution of cranial capacity in Homo, with the null hypothesis that the changes over time are a result of one process. We employ a new method that uses a resampling approach to address the limitations imposed on the methods of previous studies. To test the null hypothesis, we examine the distribution of changes in adjacent temporal samples and ask whether there are differences between earlier and later samples. Our analyses do not reject the hypothesis of a single process of brain size change, but they are incompatible with an interpretation of punctuated equilibrium during this period. The results of this paper are difficult to reconcile with the case for cladogenesis in the Homo lineage during the Pleistocene.

Type
Articles
Information
Paleobiology , Volume 29 , Issue 2 , Spring 2003 , pp. 186 - 196
Copyright
Copyright © The Paleontological Society

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