Has anyone here thought of personality types to go along with high IQ? My husband is an INTJ and exhibits quite a high number of the characteristics listed in the OP. I have just suggested to him that he take an IQ test, as maybe INTJs are more prone to higher IQs. Our daughter, 6, has a very similar personality to him, and this makes me wonder a few things about her, as well. Thank you for that OP, and thank you to all who have contributed to this thread. I have a BA in psychology, and these things just fascinate me.