A goal-oriented, therapeutic approach that treats emotional and behavioral disorders as maladaptive learned responses that can be replaced by healthier ones with appropriate training.

In contrast to the psychoanalytic method of Sigmund Freud (1856-1939), which focuses on unconscious mental processes and their roots in the past, behavior therapy focuses on observable behavior and its modification in the present. Behavior therapy was developed during the 1950s by researchers and therapists critical of the psychodynamic treatment methods that prevailed at the time. It drew on a variety of theoretical work, including the classical conditioning principles of the Russian physiologist Ivan Pavlov (1849-1936), who became famous for experiments in which dogs were trained to salivate at the sound of a bell, and the work of American B.F. Skinner (1904-1990), who pioneered the concept of operant conditioning, in which behavior is modified by changing the response it elicits. By...