Dan look up neuroplasicity, I believe it's entirely possible to change the brain. Marie Pasinski, M.D.: Nurture the Miracle of Neuroplasticity

That's just one article but there is a ton of good articles about it. I'm no dr. but the brain is an amazing organ so can't see why it would not be possible.

http://www.refocuser.com/2009/05/neu...rm-new-habits/