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There are certainly tradeoffs with IQ. There one allele that raises your IQ a bunch but has a good chance of causing you to die early. And if you had a domest

There are certainly tradeoffs with IQ. There one allele that raises your IQ a bunch but has a good chance of causing you to die early. And if you had a domesticated species of human I'd expect that that might hurt intelligence. But given that humans' primary competition has been other humans and given that this is true the world over I expect that IQ would be roughly equally valuable everywhere and so we shouldn't see big differences, genetically, between populations like you do with adaptations to other sorts of particular environments.

iguy 9y ago
In the western word, today's environment seems to select against IQ -- number of children anti-correlates. This wasn't true 200, 300 years ago. So that's one example of two environments which value this trait very differently. Sure, one of them is highly unusual... The flores island hobbits are another example, where it seems that humaniods evolved quite dramatically smaller brains. But islands are also unusual, obviously.