Psychology Psychology is the science that studies why humans and animals behave as they do. Psychologists are interested in understanding the whole range of human experience, including the needs and motives of people, their thought processes, their feelings, and emotions. Psychologists study how our senses work, and why and how people learn and forget. They try to discover why some people lead happy lives, while others are unhappy and do not work well at their jobs. Psychology is sometimes classed with biology, sociology, and anthropology as one of the behavioral sciences. Teachers use principles of psychology to help students learn quickly and easily. Books by psychologists help parents rear thei