well, isn't this abstract thinking?
and isn't this "N" "T"?
so IQ tests basically test one's NT-ness! And thus NTs should dominate--it's their home turf! However, IQs don't test plenty of other styles of intelligence.
But I do think NTs should have the highest scoring IQs--not because they're smarter, but b/c that's what the tests test! One's NT-ness!