Anthropologists have long recognized that cultural evolution critically depends on the transmission and generation of information. However, between the selection pressures of evolution and the actual behaviour of individuals, scientists have suspected that other processes are at work. With the advent of what has come to be known as the cognitive revolution, psychologists are now exploring the evolved problem-solving and information-processing mechanisms that allow humans to absorb and generate culture. The purpose of this book is to introduce the newly crystallizing field of evolutionary psychology, which supplied the necessary connection between the underlying evolutionary biology and the complex and irreducible social phenomena studied by anthropologists, sociologists, economists, and historians.