Only What You Can See
Behaviorism, launched by John B. Watson's 1913 manifesto "Psychology as the Behaviorist Views It," rejected introspection and the study of consciousness altogether, arguing that psychology should be a purely objective science of observable behavior. Watson's famous (and ethically troubling) "Little Albert" experiment (1920) conditioned a fear response to a white rat in an infant, demonstrating that even emotional responses could be built through classical conditioning.
Classical conditioning itself was discovered not by a psychologist but by the Russian physiologist Ivan Pavlov, studying digestion in dogs. Pavlov noticed his dogs salivated not only to food (an unconditioned stimulus producing an unconditioned response) but eventually to a previously neutral cue, like a bell, once it had been repeatedly paired with food — the bell became a conditioned stimulus producing a conditioned response. This stimulus-response (S-R) model suggested behavior could be explained as a direct product of environmental associations.
B.F. Skinner extended behaviorism through operant conditioning, which explains behavior through its consequences rather than its antecedents. Using the "Skinner box," he showed that behavior followed by reinforcement becomes more likely to recur, while behavior followed by punishment becomes less likely — a framework Skinner extended into a thoroughgoing "radical behaviorism" that treated internal mental states as unnecessary for explaining behavior at all.
| Figure | Contribution |
|---|---|
| Watson | 1913 manifesto; founded behaviorism as a movement |
| Pavlov | Discovered classical conditioning (accidentally, studying digestion) |
| Skinner | Developed operant conditioning and radical behaviorism |
Common pitfall: assuming Pavlov set out to study learning. He did not — he was a physiologist studying digestive secretions, and classical conditioning was an accidental discovery that redirected the course of an entire branch of psychology.