I was surfing trough this web of sites (army combatives,lots of stuff on that etc.)
This site I picked is actually from the bouncer section of the site map http://www.stormpages.com/handtohand22/page62.htm
Good insight to psychology,animal-to-human attitude and some medical stuff (reptile brain etc.)
This makes me think of getting that precious book on this issue back from www.taijiworld.com from free books section (reptilian brain and other related material).