http://fora.tv/2011/02/15/Robert_Sapols ... er_Primate
Dr. Robert Sapolsky is a professor of Biology and Neurology at Stanford University. He is a research associate at the National Museums of Kenya. Dr. Sapolsky is the author of several works of nonfiction, including A Primate's Memoir, The Trouble with Testosterone, Why Zebras Don't Get Ulcers and Monkeyluv: And Other Essays on Our Lives as Animals.
An excerpt from the talk, on Dopamine:
[youtube]http://www.youtube.com/watch?v=axrywDP9Ii0[/youtube]