So Occam's Razor points to culture alone. But I grant that brain adaptation *could* have happened. I just don't see clear evidence of brain differences between populations.
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The advantageous adaptations from archaic introgression would spread; the bad stuff wouldn't. Archaeology suggests brains weren't a relative strength of archaic hominins.
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there is no single environment in which things are advantageous or not.
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I think differences in appearance have causes more recent than ancient introgression: https://www.gnxp.com/WordPress/2015/06/14/allowing-the-dead-to-speak/ …
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