Conversation

There is a sort of popular idea that you can only really relate to people 2 SDs in either direction from you. 1 SD = 68th percentile.
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At some point, people get annoyed at not being able to convey their thoughts. Communication practice of different kinds helps, but...
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... high IQ people past that point also grow massively overrepresented in asperger's and other social disorders, so good luck with that.
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I spent far too much time reading about psychometrics when I was 16/17. Lots of well-established findings on this already.