Single origin hypothesis

The recent African origin of modern humans – also called the "Out of Africa" theory (OOA), recent single-origin hypothesis (RSOH), replacement hypothesis, or recent African origin model (RAO) – is, in paleoanthropology, the dominant model of the geographic origin and early migration of anatomically modern humans (Homo sapiens), which proposes a single area of origin for modern humans. According to this model, modern humans evolved in East Africa between 400,000 and 200,000 years ago, and then began to disperse throughout the world roughly 70,000 to 135,000 years ago. The single-origin hypothesis is cited as having the scientific consensus as of the mid-2000s.

An archaic view of hominid evolution, Polygenism, holds that different human peoples had differing origins. Many religious texts refer to this concept.

From 1984 to 2003, an alternate hypothesis was the multiregional origin of modern humans, which envisioned a wave of Homo sapiens migrating earlier from Africa and interbreeding with local Homo erectus populations in varied regions of the globe.

In the 2010s, genomic testing of living populations has located archaic admixture of modern humans outside of Africa with Neanderthals and Denisovans. As of 2011, it appears likely that there were two waves of migration out of Africa. The first took place between 130,000–115,000 years ago via northern Africa, and appears to have mostly died out or retreated (although there is some evidence of a presence of modern humans in China about 80,000 years ago). A second dispersal took place via the so-called Southern Route, following the southern coastline of Asia, which led to the lasting colonization of Eurasia and Australia by around 50,000 years ago. The earliest evidence of humans in Australia is at least 65,000 years old. Europe was populated by an early offshoot which settled the Near East and Europe (post-Toba hypothesis).

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