Date: 03 Mar 2012
Brain Size Growth and Life History in Human Evolution
- Steven R. Leigh
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Increases in endocranial volume (a measure of brain size) play a major role in human evolution. Despite the importance of brain size increase, the developmental bases of human brain size evolution remain poorly characterized. Comparative analyses of endocranial volume size growth illustrate that distinctions between humans and other primates are consequences of differences in rates of brain size growth, with little evidence for differences in growth duration. Evaluation of available juvenile fossils shows that earliest hominins do not differ perceptibly from chimpanzees (Pan). However, rapid and human-like early brain growth apparently characterized Homo erectus at about 1 Ma before present. Neandertals show patterns of brain growth consistent with modern humans during infancy, but reach larger sizes than modern humans as a result of differences in later growth. Growth analyses reveal commonalities in patterns of early brain size growth during the last million years human evolution, despite major increases in adult size. This result implies consistency across hominins in terms of maternal metabolic costs of infancy. Continued size growth past infancy in Neandertals and modern humans, when compared to earlier hominins, may have cognitive implications. Differences between Neandertals and modern humans are implied, but difficult to define with certainty.
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- Brain Size Growth and Life History in Human Evolution
Volume 39, Issue 4 , pp 587-599
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- Homo erectus
- Steven R. Leigh (1)
- Author Affiliations
- 1. Department of Anthropology, Institute for Genomic Biology, College of Medicine, University of Illinois, 109 Davenport Hall, Urbana, IL, 61801, USA