A conditioned stimulus in classical conditioning is a previously neutral stimulus that gains the ability to elicit a learned response when paired with an unconditioned stimulus.
In classical conditioning, a conditioned stimulus (CS) is a neutral stimulus that acquires the ability to elicit a learned response after being paired with an unconditioned stimulus (US). For example, in Pavlov's experiment, the bell became the conditioned stimulus that made the dog drool (conditioned response) due to its association with food (unconditioned stimulus).
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