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teageegeepea comments on Against the standard narrative of human sexual evolution - Less Wrong
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The best I can come up with is this article identifying the timeframe of divergence; I too would be interested in scholarship on the evolutionary pressures responsible. The only factor I'm aware of is the Congo River, which divides the habitats of the two species and may have split their populations. (Neither can swim.)
Pedantic correction: his name is Richard Wrangham with a 'g'. The book is "Demonic Males: Apes and the Origin of Human Violence", co-authored with Dale Peterson. I have a post on it here.
Wrangham has another book, "Catching Fire: How Cooking Made Us Human", which theorizes that the increased calories resulting from food (particularly meat) preparation allowed us to reduce our gut size and increase our brain size, along with introducing pair-bonding. He discusses it in this diavlog.