I think he's one of the most extreme extroverts on the planet, he doesn't seem to have an internal monologue, doesn't seem to read widely aside from a few tweets praising him on Twitter or whatever social network he is on now. He's very much a man of action, not a great thinker, no especially complex thought. I could probably find some reports that psychologists did of him that may cover his level of extroversion that may cover this better.
https://sci-hub.se/https://doi.org/1...id.2016.10.053