This unique introductory textbook, the first to address psychology as a rigorous natural science, applies to the study of human behavior the same scientific standards taken for granted in other natural sciences. The result is a scientific psychology that studies the evolutionary, physiological, and environmental variables determining behavior. The authors discuss the relationship between science and psychology and examine issues traditionally important to psychologists, showing how these matters are often better understood by a natural science approach. Special features include; an outline and a summary for each chapter detailed learning objectives bold type for important terms italicized definitions, and a glossary.£/LIST£