期刊
THEORETICAL POPULATION BIOLOGY
卷 100, 期 -, 页码 6-12出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.tpb.2014.11.006
关键词
Catastrophic bifurcation; Innovation; Carrying capacity; Creative explosion; Toolkit diversity; Neural hypothesis
资金
- Monbukagakusho grant [22101004]
- Grants-in-Aid for Scientific Research [22101004] Funding Source: KAKEN
The coupled dynamics of the size and the mean cultural/technological level of a population, with positive feedback between these two variables, is modeled in the Malthusian-Boserupian framework. Bifurcation diagrams, with innovativeness or the cultureless carrying capacity as the parameter, show that abrupt transitions in the mean cultural level are possible. For example, a gradual evolutionary change toward greater innate innovativeness would produce an associated gradual increase in mean cultural level, until a threshold is crossed that triggers an abrupt cultural regime shift. Hence, the model may help explain the apparently sudden and dramatic efflorescences of Palaeolithic/Stone Age culture during the Late Pleistocene, without having to invoke major contemporaneous genetic changes in cognition. The results of statistical studies on the association between population size and toolkit diversity among ethnographic societies are also discussed. (C) 2014 Elsevier Inc. All rights reserved.
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