title: Late Pleistocene demography and the appearance of modern human behavior.
abstract: The origins of modern human behavior are marked by increased symbolic and technological complexity in the archaeological record. In western Eurasia this transition, the Upper Paleolithic, occurred about 45,000 years ago, but many of its features appear transiently in southern Africa about 45,000 years earlier. We show that demography is a major determinant in the maintenance of cultural complexity and that variation in regional subpopulation density and/or migratory activity results in spatial structuring of cultural skill accumulation. Genetic estimates of regional population size over time show that densities in early Upper Paleolithic Europe were similar to those in sub-Saharan Africa when modern behavior first appeared. Demographic factors can thus explain geographic variation in the timing of the first appearance of modern behavior without invoking increased cognitive capacity.
authors.affiliation: Research Department of Genetics, Evolution, and Environment, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK.
authors.forename: Adam
authors.initials: A
authors.lastname: Powell
authors.forename: Stephen
authors.initials: S
authors.lastname: Shennan
authors.forename: Mark G
authors.initials: MG
authors.lastname: Thomas
mesh_terms: D000349:Africa; D000884:Anthropology, Cultural; D001106:Archaeology; D001208:Asia; D005075:Biological Evolution; D003468:Cultural Evolution; D004641:Emigration and Immigration; D005060:Europe; D006801:Humans; D008877:Middle East; D008962:Models, Theoretical; D011156:Population Density; D011157:Population Dynamics; D012919:Social Behavior; D013995:Time