Nicholas Humphrey, Emeritus Professor of Psychology at the London School of Economics, studies the evolution of intelligence and consciousness. He was the first to demonstrate the existence of "blindsight" in monkeys, and he has also studied mountain gorillas with Dian Fossey in Rwanda, proposed the celebrated theory of the "social function of intellect," and investigated the evolutionary background of religion, art, healing, death-awareness and suicide. His new book, Sentience: The Invention of Consciousness, is available for purchase now.