I've never heard studies on that but I've always believed that too...just look at all the different breeds of dogs, most were selectively bred to promote certain temperaments or character traits. Hunting dogs were carefully bred to increase their instinct to track prey, shepherds to herd livestock...even pit bulls can be bred to be gentle or misbred to increase viciousness.
Catchy, I don't you've seen this thread yet. Are you familiar with Dr. Caroline Leaf? She's a famous Christian neuroscientist who has done some amazing studies on how to fix your brain and even change your DNA thru following simple biblical principles:
http://livingfaithforum.com/forum/sh...fix-your-brain