Psychology from the Standpoint of a Behaviorist

John B. Watson's Psychology from the Standpoint of a Behaviorist (1919) is a foundational work in behaviorism. This approach to psychology, which Watson championed, focuses exclusively on observable and measurable behavior, rejecting introspection and subjective mental states. Watson argued that psychology should be an objective, experimental branch of natural science, studying the relationship between environmental stimuli and behavioral responses. He applied principles from animal psychology to humans, advocating for conditioning as a key research tool. Watson's work significantly influenced the direction of psychology in the United States during the early 20th century.123