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Humans split into separate groups for a million years, then merged - David Reich
The Signal
Multiple independent studies now suggest that the history of anatomically modern humans is not one of homogeneous development, but rather a complex process defined by a deep population split followed by later recombination. This contested model posits an initial separation occurring well over one million years ago, with a subsequent re-mixture event taking place within the last few hundred thousand years.
The Case
- The speaker claims that at least three to five distinct studies support this deep-split model, though they provide no citations or specific references to validate the exact study count.
- The inferred historical structure features a split happening more than one million years ago, followed by a coming-together event on the order of a few hundred thousand years ago that established the ancestry of modern people.
- While the speaker explicitly names the Khoisan — a group of indigenous southern African hunter-gatherers — as being included in these models, they admit the inclusion of other groups and the exact proportions of ancestry remain either unspecified or tentative.
- The transcript observes that while individual papers employ different underlying models to fit their data, they consistently arrive at this shared structural feature of deep lineage separation and later admixture.
The 1 Minute Signal Take
This is a high-level summary of a complex scientific model that likely requires access to the underlying research to be properly vetted. Skip it if you are looking for a definitive academic verdict, as the video provides an overview of a recurring pattern rather than the specific evidentiary support.
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