Not sure if it would be helpful, but the Eides who wrote the Dyslexic Advantage have this slideshow talking about trade-offs in gifted minds. http://www.slideshare.net/drseide/brains-on-fire-gifted-thinkers

Just strikes me that swapping in written instead of spoken and your descriptions sounds like dyslexia. Dunno, but maybe that slideshow can offer at least some abstract measures to look at it.