"We always tend to think that humans have just had a continuous surge in brain size over the last two million years, but actually over the last thirty thousand years brain size has decreased by 10 to 15 percent. [...] This gracility is exactly the same pattern we see in the evolution of dogs from wolves, or bonobos from chimpanzees, or domesticated foxes from wild foxes. In all these cases an increasing gracility of the bone is an incidental effect.
I think that we have to start thinking about the idea that humans in the last 30, 40, or 50 thousand years have been domesticating ourselves. If we're following the bonobo or dog pattern, we're moving toward a form of ourselves with more and more juvenile behavior. [...] I think that current evidence is that we're in the middle of an evolutionary event in which tooth size is falling, jaw size is falling, brain size is falling, and it's quite reasonable to imagine that we're continuing to tame ourselves."
Richard Wrangham: The Evolution of Cooking:
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