Behaviorism

Watson argues that psychology must abandon consciousness and introspection and become a natural science of behavior, whose goal is the prediction and control of human activity. He rejects the introspective psychology that had dominated the field, dismissing consciousness as a "masquerade for the soul" with no place in a natural science. The book defines behaviorism as a science that takes the whole field of human adjustment as its own, and it treats the stimulus-response unit as the basic datum of psychology. Watson contends that if behaviorism's facts were all at hand, the behaviorist could tell from watching an act what situation caused it, and could arrange the situation to bring about any desired action. The book is a systematic popular presentation of the mature behaviorist position.

The famous passage in which Watson claims he could train any healthy infant to become any type of specialist has been widely quoted as evidence of his extreme environmentalism. However, the full passage includes a crucial qualification that is usually omitted: Watson admits he is "going beyond my facts" and notes that the advocates of the contrary view have been doing so for thousands of years. The sentence is thus a rhetorical challenge to hereditarian assumptions, not a literal claim about the omnipotence of conditioning. Watson had, in fact, conducted extensive ethological studies of instinctive behavior in animals early in his career, and his rejection of instinct in the 1920s was a significant departure from his earlier position. Modern critics often present the quote without its context, making Watson's position appear more radical than it was.

Helio Carpintero's 2004 study in History of Psychology documents significant textual differences between the two editions. Watson maximized the variations, to the point of considering the second edition nearly a brand-new book. He added approximately one hundred pages, deleted twenty-five to thirty pages of what he considered outgrown material, attempted to remove some overstatements and exaggerations, and made minor shifts in the theory. A contemporary review in the American Journal of Psychiatry noted that while the point of view had not fundamentally changed, the revisions revealed Watson's response to criticism and his efforts to present his ideas to a general audience more effectively. This editorial history matters because the edition a reader encounters shapes their understanding of Watson's mature position.

The book was a major cultural event. The New York Times review in 1925 stated that it initiated "a new epoch in the intellectual history of man," and within five years behaviorism became a movement debated in periodicals ranging from parent magazines to journals of philosophy. Reviews acknowledged the force of Watson's critique of introspection and the clarity of his program, but many psychologists objected that behaviorism could not account for consciousness, imagery, and complex reasoning. A review in the American Journal of Psychiatry predicted that sane psychiatry would become a tempered mixture of psychoanalysis and behaviorism rather than the pure behaviorist program Watson envisioned. The book established behaviorism as a dominant orientation in American psychology and made Watson, after Freud, perhaps the best-known psychologist of his era.

Psychology from the Standpoint of a Behaviorist (1919) was Watson's systematic textbook, covering receptors, effectors, instinct, habit, emotion, and thought in detail. Behaviorism (1924/1930) is a popular presentation aimed at a general audience, based on a series of lectures Watson delivered at the People's Institute in New York. It is less technical and more polemical, focused on contrasting the new psychology with the old and on demonstrating behaviorism's practical promise. The content overlaps substantially, but the later book is more accessible and more concerned with applications to child-rearing, education, and social conduct. Together they represent Watson's systematic statement and his popularization of behaviorism, respectively.

Watson argues that emotions are not innate mental states but patterns of visceral and glandular responses that can be conditioned. He identifies three basic emotional reactions present in infants—fear, rage, and love—and contends that all other emotional responses are built on these through conditioning. He rejects the concept of instinct as an explanatory category, arguing that most of what had been called instinct is actually the result of early training and habit formation. This position represented a significant shift from his earlier work, in which he had treated instinct as a real category of behavior. The environmentalist turn was central to the book's argument that personality is the outgrowth of habits formed by conditioning, and that human conduct is therefore subject to prediction and control.