https://academic.oup.com/mbe/advance-article-pdf/doi/10.1093/molbev/msaf041/61812258/msaf041.pdf

Insufficient evidence for a severe bottleneck
in humans during the Early to Middle
Pleistocene transition

Abstract
A recently proposed model suggests a severe
bottleneck in the panmictic ancestral
population of modern humans during the Early
to Middle Pleistocene transition. Here, we
show this model provides a worse fit to the
data than a panmictic model without the
bottleneck.

"Finally, there is growing evidence that
humans do not descend from a single, panmictic
13 ancestral population. Instead, recent
studies suggest that humans descend from two
(or more) 14 divergent populations that admixed
together prior to the OOA event."

"In summary, we find there is insufficient
evidence to support a model of human evolution
where a panmictic population undergoes a
severe bottleneck approximately 1Mya. We
stress that newly proposed models should be
shown to fit the data just as well or better
than traditional models."

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