NancyLebovitz comments on On the Openness personality trait & 'rationality' - Less Wrong
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Alternate explanation for openness being lower in regions with high parasite loads-- openness is more costly in terms of energy, and people with high parasite loads have less to spare. I don't know how you'd test that.
As for having had some mistaken beliefs as a result of a high openness level, you take your chances. Have you had unconventional beliefs which turned out to have good evidence for them?
Correlate openness with other drains on energy, like non-communicable, non-immune-weakening disorders.
Unrelatedly, I'm still pondering the implications of Limbaugh-type demogagues characterizing illegal immigrants as parasites in evocative language. Probably just a priming thing they aren't even aware of, but it would seem to make their rhetoric more effective.
Also, IQ. I stressed the lack of correlation with longevity and weak correlation of Openness with IQ because they seemed to me to be evidence against the most obvious confounds.