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Dr
Julie
Field
Department of Anthropology
4034 Smith Labs
174 W 18th Avenue
Colombus, Ohio
43210
USA
The last decade of research into the origins of modern humans has produced much evidence in support for a last common ancestral population in Africa in the recent past - within the last 150,000 years. One of the most intriguing aspects of a recent African origin of modern humans is the spatial and temporal pattern of differentiation of non-African populations.
All sources of data available to reconstruct such a history of population differentiation point to heterogeneous spatial and temporal patterns. The prehistoric record shows asynchronous modern human occupation of Eurasia, with dates from Australia somewhat older than those from the Levant and Europe. Furthermore, the character of the archaeological record of these early dispersing humans is strikingly different in southeast Asia-Australo/Melanesia and Western Asia/Europe. In terms of morphology, the record is much more scarce, although significant differences between early fossils in Europe and Australia can be observed. These differences can be explained in two ways. On the one hand, it is possible that a single human population dispersed out of Africa and that differentiation occurred in Asia prior to subsequent expansion to the East (southeast Asia-Australo/Melanesia) and Northwest (Eurasia). On the other, more than one African population could have dispersed to Eurasia, magnifying their pre-existing African differences in the process. These different explanations have been put forward as alternative hypotheses for the first dispersal of modern humans out of Africa:
Neither of these hypotheses finds comprehensive support in the currently known palaeoanthropological record. Therefore, all scientific efforts at trying to elucidate the process by which the first human populations colonised Eurasia have to attempt to build models that include the causes of dispersal (Northwest and East African palaeoecology, human demography), the conditions and constraints at the time of dispersal (palaeoenvironment, geography, demography, subsistence), as well as the consequences (the biological and cultural differentiation of Eurasian peoples), and test such models against the available data. This project aimed to model of one of the scenarios described above, namely that of multiple dispersals out of Africa, by focusing on the viability of a Southern Dispersal Route from East Africa to southern Asia and eventually Australo-Melanesia, independent of human expansions into mainland Eurasia.
This project thus addresses four major scientific issues with four aims:
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