The Biology of Giftedness
Unless we want to believe in some type of mystical causation or in pure chance, our basic assumption in trying to understand exceptional intellectual capacity must be that all cognitive functions, including the rarest and the most exceptional, are biologically based. If there is a causal mechanism for precocity, for high-level intellectual functioning, and for creativity, it must be a facet, or a combination of facets, of the brain’s structure and operations.
The difficulty in talking about this is the lack of studies specifically intended to reveal the biological basis of giftedness and intellectual creativity. It’s made even more difficult by the lack of studies which might show common mental traits among the gifted and the creative. It’s a dangerous area even to think about because there are so many ways to go wrong. Theories, more or less plausible, are possible, but not proof.
In the literature, both high levels of giftedness and of creativity are more often associated with various types of psychopathology than with fundamental brain mechanisms. Many lists of identifying characteristics mix cognitive and personality traits without attempting to distinguish between them. To confuse the issue even further, several streams of pop psychology lead people to believe that certain personal characteristics are either indicative of giftedness or are forms of giftedness in themselves. These include Goleman’s theory of emotional intelligence, Gardner’s multiple intelligences, and Dabrowski’s oversensitivities as channeled by some giftedness advocates.
To put it plainly: giftedness is not a personality trait. Creativity is not a personality trait. Intellectual giftedness and creativity are collections of cognitive traits. Both are accompanied by personality traits which may be a direct outcome of particular cognitive traits, and some of which are considered a possible prerequisite for the fulfillment of potential. The abilities which enable creativity in very different domains are all brain-based, some more visual or physical, but all depending, at least to some extent, on cognition.

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[From my article Imaging Intelligence.] http://talentdevelop.com/articles/imaging.html