It's the assumption of independence between traits that goes wrong. The interactions introduce noise, and noise slows directional change, in the extreme reduces it to a random walk.
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Some long-civilized populations have significantly higher IQs than any hunter-gatherers. The likely implication is that natural selection in those pops has gradually raised average IQ over time.
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Which long-civilized populations have lower IQs than which hunter-gatherers?
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Once you've got language to efficiently transmit the accumulated knowledge of a culture, new humans don't have to figure everything out from scratch.
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Yes, and all increases in complexity and demands on cognition stop at exactly that point rather than ... increasing.
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the invention of language *reduced* the selective pressure for intelligence - sure.