Seems like most of the benefits came from being less wrapped up in his idea of himself as a Smart Guy. Good ways of accomplishing the same aim without brain damage? Doing difficult but worthwhile things for which being smart is not very helpful, maybe?
Getting in touch with your own blithering stupidity, and realising that what you had a case of was hubris. Worked for me.
I'm not sure of good ways to achieve this other than having your nose rubbed good and hard in it, particularly if you're smart enough to have trouble finding people who make you feel dumb by comparison.
I dunno. Try to take average people seriously as worthwhile humans? Emotionally, not just intellectually. Intellectually is an excellent start, of course.
What does it feel like to be stupid?
Full article:
http://www.quora.com/What-does-it-feel-like-to-be-stupid