Present-day behavioral and cognitive neuroscience is based on the idea that the conventional philosophical theory of the mind provides a reliable guide to the functional organization of the brain. Consequently, much effort has been expended in a search for the neural basis of such psychological categories as memory, attention, emotion, motivation, and perception. The Evolving Brain: The Mind and the Neural Control of Behavior argues that (a) conventional psychological concepts originate from the philosophical speculations of ancient Greek philosophers, especially Plato and Aristotle; (b) there is serious doubt that these ancient philosophical analyses provide a reliable guide to the understanding of the human mind, human behavior, or the organization of the brain; and (c) that modern scientific studies of animal behavior provide a better guide to the study of the functional organization of the brain than is provided by conventional psychological concepts. C. H. Vanderwolf, Ph.D., DSC., is a Professor Emeritus in the Department of Psychology and Graduate Program in Neuroscience at the University of Western Ontario, London, Ontario, Canada.