Classical Conditioning
The learning process discovered by Ivan Pavlov in which a neutral stimulus becomes associated with a reflexive response.
Classical conditioning is a form of associative learning discovered by Ivan Pavlov, a Russian physiologist studying digestion, around the turn of the 20th century. He noticed that dogs began salivating at the sight of the assistant who brought food, before any food appeared. In his famous experiments, a neutral stimulus — a bell — was repeatedly paired with food, and the dogs eventually salivated to the bell alone. Pavlov showed that reflexes, once thought to be hard-wired, can be learned.
The vocabulary is precise. The unconditioned stimulus (US, food) naturally triggers the unconditioned response (UR, salivation). A neutral stimulus (the bell) that predicts the US becomes the conditioned stimulus (CS), and its response is the conditioned response (CR) — salivation to the bell. The CR resembles the UR but is acquired: it appears only after the pairing. Acquisition follows a learning curve and is fastest when the CS reliably precedes the US.
Conditioned responses are not permanent. If the CS is repeatedly presented without the US, the response weakens and eventually disappears — extinction. But extinction is not erasure: after a pause, the response returns spontaneously (spontaneous recovery), and a fully extinguished CS can be reacquired quickly, implying the original association survives in some form. Generalization extends the response to similar stimuli; discrimination training narrows it. These phenomena show that conditioning is adaptive learning about the predictive structure of the environment, not a mechanical reflex substitution.
Classical conditioning explains a wide range of human behavior: learned fears and phobias (Little Albert, Watson and Rayner 1920), conditioned drug tolerance, food aversions acquired in a single trial, and the emotional responses exploited in advertising. It is also a therapeutic tool: systematic desensitization and exposure therapy extinguish fear responses by pairing feared stimuli with safety. Classical conditioning is often contrasted with operant conditioning, in which behavior is shaped by its consequences rather than by antecedent associations — the two together form the foundation of behaviorism.
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behavior learning pavlov psychology
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