Brain Size Growth and Life History in Human Evolution
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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.
KeywordsOntogeny Paleoanthropology Australopithecus Homo erectus Neandertals
I thank Drs. Phillipp Mitteroecker and Phillipp Gunz for organizing the stimulating workshop, “Human Evo-Devo: The Role of Development in Human Evolution” at the Konrad Lorenz Institute for Evolution and Cognition Research (Altenberg, Austria). Other conference participants provided valuable advice and feedback on the research. Two anonymous reviewers provided valuable insights with skill, patience, and professionalism.
- Darwin, C. (1859). On the Origin of the Species by Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life. London: J. Murray.Google Scholar
- d’Errico, F., Vanhaeren, M., Barton, N., Bouzouggar, A., Mienis, H., Richter, D., et al. (2009). Out of Africa: Modern human origins special feature: Additional evidence on the use of personal ornaments in the middle paleolithic of North Africa. Proceedings of the National Academy of Sciences of the United States of America, 106, 16051–16056.PubMedCrossRefGoogle Scholar
- Dubois, E. (1897). Ueber die Abhängigkeit des Hirngewichtes von derKörpergrösse bei den Säugtieren. Archives of Anthropology, 25, 1–28.Google Scholar
- Gould, S. J. (1981). The Mismeasure of Man. New York: Alfred R. Knopf.Google Scholar
- Gould, S. J., & Eldredge, N. (1977). Punctuated equilibria: The tempo and mode of evolution reconsidered. Paleobiology, 3, 115–151.Google Scholar
- Gunz, P., Neubauer, S., Golovanova, L., Doronichev, V., Maureille, B., & Hublin, J.-J. (2012). A uniquely human pattern of endocranial development. Insights from a new cranial reconstruction of the Neandertal newborn from Mesmaiskaya. Journal of Human Evolution. http://dx.doi.org/10.1016/j.jhevol.2011.11.013.
- Harvey, P. H., Martin, R. D., & Clutton-Brock, T. H. (1987). Life histories in a comparative perspective. In B. B. Smuts, D. L. Cheney, R. M. Seyfarth, R. W. Wrangham, & T. T. Struhsaker (Eds.), Primate Societies (pp. 181–196). Chicago: University of Chicago Press.Google Scholar
- Hill, K., & Hurtado, A. M. (1996). Ache Life History: The Ecology and Demography of a Foraging People. New York: Walter de Gruyter, Inc.Google Scholar
- Kappelman, J., & Nachman, B. A. (2010). Temperate migrations: Climatically-mediated movements north (and south again?). American Journal of Physical Anthropology, 141, 139.Google Scholar
- Marchand, F. (1902). Ueber Das Hirngewicht Des Menschen. Leipzig: B.G. Teubner.Google Scholar
- Martin, R. D. (1983). Human brain evolution in an ecological context (James Arthur Lecture on the Evolution of the Human Brain, no. 52, 1982). New York: American Museum of Natural History.Google Scholar
- Martin, R. D. (1989). Evolution of the brain in early homininds. Ossa, 14, 49–62.Google Scholar
- Neubauer, S., & Hublin, J.-J. (2011). The evolution of human brain development. Evolutionary Biology. doi 10.1007/s11692-011-9156-1.
- Ponce de Leon, M. S., Golovanova, L., Doronichev, V., Romanova, G., Akazawa, T., Kondo, O., et al. (2008). Neanderthal brain size at birth provides insights into the evolution of human life history. Proceedings of the National Academy of Sciences of the United States of America, 105, 13764–13768.PubMedCrossRefGoogle Scholar
- Rightmire, G. P. (1981). Patterns in the evolution of Homo erectus. Paleobiology, 7, 241–246.Google Scholar
- Sacher, G. A. (1959). Relationship of lifespan to brain weight and body weight in mammals. In G. E. W. Wolstenholme & M. O’Connor (Eds.), C.I.B.A. foundation Colloquia on aging volume 5: The lifespan of animals (pp. 115–133). London: Churchill.Google Scholar
- Schwartz, J. H., Holloway, R. L., Broadfield, D. C., Tattersall, I., & Yuan, M. S. (2004). The Human Fossil Record Volume 3, Brain Endocasts - the Paleoneurological Evidence. Hoboken, NJ: John Wiley and Sons.Google Scholar
- Walker, A., & Ruff, C. B. (1993). Reconstruction of the pelvis. In A. Walker & R. Leakey (Eds.), The Nariokotome Homo erectus Skeleton (pp. 221–233). Cambridge: Harvard Univ. Press.Google Scholar
- Wolpoff, M. H. (1986). Stasis in the interpretation of evolution in Homo erectus: A reply to Rightmire. Paleobiology, 12, 325–328.Google Scholar