I was thinking about that; either that or sociology; the problem with that though, particularily psychology is that one would have to go to a university to learn it thoroughly; the others are easily learned with books and vicdeos and whatnot but for something has complex as psychology I'd raher have an actual professor teaching me; it is a good area to learn but I don't have the money and I'm not confident in my skill level to teach it to myself thoroughly. But, I do know of another..."art" that incorpoarates pieces of psychology and sociology:
Kochojutsu; also known as the Art of the Butterfly, or the Grey Man. It's a system that when learned will allow you to disappear and reappear at will, read minds, control minds, see the future, and become invincible; it's actually apretty important one haha; can't believe I fogrgot to list it. XD
With Kochojutsu one can have virtual superhuman abilities. All of it is simple techniques and methods though; nothing supernatural about it. A great book to begin training in Kochojutsu is Jotoros "Shadow Warrior: Secrets of Invisibility, Mind Reading, and Thought Control.
After a while of training, no one can lie to my face anymore, I never, ever lose a fight, I can see the hopes and dreams and fears of others around me, and I can disappear and never come back or pop up thousands of miles away. Kochojutsu is best explained as an art for doing virtually anything, with virtually nothing.