In classical conditioning, a situation (the "conditioned stimulus") and a consequence (the "unconditioned stimulus") are associated with each other. The subject displays an existing behaviour in response to the unconditioned stimulus; with repetition, the subject displays the same behaviour in response to the conditioned stimulus, even without the unconditioned stimulus.
In operant conditioning, the subject displays a behaviour in response to an original situation. A consequence is applied, which may be the presence of a stimulus (positive) or the absence of one (negative). If the consequence is desirable, the behaviour is reinforced. If the consequence is undesirable, the behaviour is punished.
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