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Behaviourism

Behaviourism is the movement that redefined psychology as the objective study of observable behaviour, setting aside consciousness and introspection in favour of publicly measurable data, with conditioning as the central process of learning. Founded as a programme by John Watson in 1913 and brought to its mature form by B.F. Skinner, it became the dominant school of American psychology for roughly half a century before the cognitive revolution displaced it. Its learning principles, its methods, and its applied techniques outlived its claim to be a complete account of the mind.

The word covers three distinct things that are easily run together. Psychological behaviourism is the science and method — the research programme founded by Watson and developed by Skinner. Analytical (or logical) behaviourism is a separate thesis in the philosophy of mind, about the meaning of mental language rather than how to do psychology; it is treated below as a distinct sense, not the movement’s philosophical wing. And the Vienna Circle’s reductive logical behaviourism is a third strain again. This page is chiefly about the first; it marks the others where they touch it.

Foundational influences

Behaviourism built on two bodies of work that were not themselves behaviourist. Ivan Pavlov — a physiologist, not a psychologist — had shown that a reflex could be conditioned, a neutral stimulus coming to elicit a response through pairing. Behaviourism took over his objective method and the conditioned reflex, but not the cortical physiology in which he framed them (his “higher nervous activity,” excitation and inhibition); Pavlov did not endorse the psychological movement raised on his findings. Edward Thorndike, working with cats in puzzle boxes, had formulated the law of effect — responses followed by satisfying consequences are strengthened — which prefigured the later analysis of behaviour by its consequences. Both stand behind behaviourism as influences rather than members.

Watson and the founding

The movement began with Watson’s 1913 manifesto “Psychology as the Behaviorist Views It,” which declared that psychology should be a purely objective natural science aimed at the prediction and control of behaviour, studying only what can be observed and setting inner mental events outside its scope. This is methodological behaviourism — a directive about what psychology may study. Watson grounded it in classical conditioning and pressed a radical environmentalism, the claim that experience rather than inheritance shapes what a person becomes. The detail of his work, and the controversies around it, sit on his own page; what the movement took from him was the objective stance, the conditioning model, and the programmatic ambition.

The schools

The neo-behaviourists. Between the wars, behaviourism diversified as theorists tried to handle learning within an objective frame. Clark Hull built a formal, hypothetico-deductive system around drive reduction and intervening variables; Edwin Guthrie made simple contiguity the principle of learning; and Edward Tolman, studying rats in mazes, argued for cognitive maps and latent learning — internal, goal-directed representations that strictly observable behaviour could not contain. Tolman called himself a behaviourist, but his appeal to inner representation was a dissent from within that would later help license the cognitive turn.

Skinner and radical behaviourism. B.F. Skinner became the central figure of the mature movement, and his position is importantly different from Watson’s — a distinction at the heart of the field. Where Watson’s methodological behaviourism set inner events outside science, Skinner’s radical behaviourism did not deny that private events — thoughts, feelings, sensations — exist; it treated them as themselves behaviour (covert behaviour), to be analysed in the same terms as public behaviour, and rejected them only as initiating causes, on the grounds that explaining behaviour by an inner state leaves the cause of that state — in the environment and the organism’s history — unexplained. His science of operant conditioning — behaviour shaped by its consequences, structured as a three-term contingency of stimulus, response, and reinforcement — is set out on his page, along with his reach into philosophy, linguistics, social design, and the reinforcement learning of AI.

Logical behaviourism in philosophy — a distinct sense. Separately from the psychological movement, a thesis sharing its name arose in philosophy: that statements about mental states can be analysed as statements about dispositions to behave. Gilbert Ryle’s The Concept of Mind (1949) is its best-known statement, though Ryle was analysing the meaning of mental concepts, not proposing a science, and resisted the label — his position is taken up on his own page as a distinct philosophical sense rather than the movement’s wing. A different, reductive version came from the Vienna Circle, where Carnap and Hempel sought to translate mental sentences into physical-thing language. Three things share the word “behaviourism”: a psychology, a thesis about the meaning of mental talk, and a programme of reductive translation.

The applied tradition

Behaviourism’s most durable deposit is a body of practical technique that remains active long after the movement’s eclipse as a general theory. The experimental analysis of behaviour — Skinner’s single-organism, high-control research programme — continues in laboratories and in its own journals (the Journal of the Experimental Analysis of Behavior and the Journal of Applied Behavior Analysis). Behaviour therapy and behaviour modification, descended from conditioning principles, treat phobias and maladaptive behaviour, with roots reaching back to the early demonstration that conditioned fears could be removed. Token economies apply reinforcement systematically in clinical and institutional settings. Programmed instruction and the teaching machine fed into educational technology.

Most prominent today is applied behaviour analysis (ABA), the systematic application of operant principles to real-world behaviour, which became a distinct discipline with its own training and standards. ABA is widely used in early intensive intervention for autism, and that use is now genuinely contested: critics — including many autistic self-advocates — argue that it can aim at normalising autistic behaviour against the person’s autonomy and question its claims, while practitioners point to outcome evidence and to reforms in practice. The controversy is live and unresolved, and it belongs to the tradition’s present, not only its history.

Decline and the cognitive revolution

Behaviourism lost its place as psychology’s dominant framework across the 1960s and 1970s — but not to a single blow. The displacement was overdetermined, several pressures converging on the same conclusion.

The most visible was Noam Chomsky’s 1959 review of Skinner’s Verbal Behavior, which argued that operant conditioning could not account for the speed, productivity, and creativity of language acquisition. It was the clearest public attack and is remembered as the turning point — but it is best read as a marker of a shift already under way across several fields, not its cause. Alongside it, the computer metaphor and information theory gave psychology a new model of mind as an information-processing system, one that the stimulus–response picture could not easily absorb; the founding of artificial intelligence and cognitive science in the mid-1950s offered internal representation, computation, and rule-following as respectable objects of study. The poverty-of-the-stimulus argument made an empirical case that complex competence, language above all, outruns what environmental shaping alone could teach. And the pressure came partly from within: Tolman’s cognitive maps had already reintroduced internal representation inside the behaviourist camp. The cumulative effect was less a refutation than a redefinition of what psychology should study — a return of the mind that behaviourism had set aside.

Critiques and what survived

Behaviourism drew sustained philosophical and ethical criticism. Against the analytical behaviourism of the philosophers, objections accumulated that the felt quality of experience exceeds any disposition to behave, that Putnam’s imagined “super-spartans” could have the mental states without the behavioural dispositions or the reverse, and that a disposition can only be specified by reference to further mental states — objections that helped move the philosophy of mind on toward identity theory and functionalism (a path running through Ryle’s student Daniel Dennett, with Sellars’s critique of the given in the background). Against the psychological movement, Skinner’s argument in Beyond Freedom and Dignity that autonomous agency is a pre-scientific notion drew the charge of denying human freedom; the ethics of behaviour modification and of Watson’s early conditioning of an infant remain points of contention.

What survived is real and is best stated plainly. As a complete theory of mind, behaviourism is rejected — it could not accommodate representation, language, or consciousness. As a set of learning principles, classical and operant conditioning remain empirically solid. As a technology — behaviour therapy, ABA, reinforcement-based intervention — it is vigorous. And as an ancestor, its account of learning by consequences runs forward into the reinforcement learning of modern machine learning — so that the field whose information-processing wing helped displace behaviourism also carries, in its reinforcement-learning wing, a direct descendant of it. The movement is historical; the toolkit is not.

Key works and further reading

See also: Watson · Skinner · Pavlov · Ryle · Chomsky