I saw this interesting graph over at Language Log:
It compares "empathizing quotient" with "systemizing quotient" -- the extent to which you connect to others' emotions and the extent to which you like to categorize things and people, and fit them into your system of understanding. (This is just for one sample of people and doesn't necessarily apply to the entire world.) You can score very high in both, or very low in both, but as this graph shows, women tend to have higher EQ and men tend to have higher SQ, though the difference between the groups is less than a typical difference between individuals. Engineers and scientists tend to have much higher SQ and also lower EQ. The green symbols on this graph are results from people with Aspergers, or people diagnosed as High Functioning Autistic. Their SQ varies but their EQ is very low. You can take the test yourself if you like. I was surprised by questions like "When I read something, I always notice whether it is grammatically correct" -- that is 100% true of me but I thought it was my little quirk, not something that would appear on a test for personality traits. Then there was "Whenever I run out of something at home, I always add it to a shopping list." Who doesn't?
My results are perfectly ordinary for someone with a PhD in engineering, I think: EQ 36, SQ 77. That puts me about where the S is in the "extreme S" label. Interesting.