Professor Robert Sapolsky Stanford University talks about his research into how chronic psychosocial stress adversely affects the brain in ways that predispose it to anxiety disorders, depression, and Alzheimer's disease. His studies of baboons in Kenya and of rodents in the laboratory established a major role for the adrenal hormone cortisol in promoting the atrophy and death of neurons in the brain.

Robert is the author of several popular books including:
'Why Zebras Don't Get Ulcers"
'Behave: The Biology of Huimans at Our Best and Worst'