Reading PG's post, it immediately reminded me of the detailed analysis of this quality in the book.
[1] http://www.amazon.com/Iconoclast-Neuroscientist-Reveals-Thin...
If you are looking for something on the topic that is a lot more "scientific", check out "Iconoclast: A Neuroscientist Reveals How to Think Differently" by Gregory Berns Ph.D. It's really quite good, and I found the appendix on how different drugs effect the brain to be interesting (where he basically shows that if you are looking to drugs to help you think differently/better, you might want to give it some more thought.)
http://www.amazon.com/Iconoclast-Neuroscientist-Reveals-Thin...
