Why is one person motivated to create a business empire whilst another is inspired to produce a beautiful work of art? Why do some people prefer a quiet life? The Psychobiology of Human Motivation explores what directs our behaviour, from basic physiological needs like hunger and thirst to more complex aspects of social behaviour like altruism. Hugh Wagner explores the limits of biological explanations and shows how humans can influence `basic' physiological drives in order to adapt to a complex social environment.