The flight or fight response has been investigated for a long time. It's complex enough that you need to read a lot of relevant studies most of which are old b

The flight or fight response has been investigated for a long time. It's complex enough that you need to read a lot of relevant studies most of which are old before you can understand it. Which makes finding a single source hard. If you want basic research start with Walter Bradford around 1915 Bodily Changes in Pain, Hunger, Fear and Rage: An Account of Recent Researches into the Function of Emotional Excitement. http://en.wikipedia.org/wiki/Walter_Bradford_Cannon http://en.wikipedia.org/wiki/Walter_Bradford_Cannon