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Cognitive Psychology: Attention · Decision making · Learning · Judgement · Memory · Motivation · Perception · Reasoning · Thinking - Cognitive processes Cognition - Outline Index
In Classical conditioning an unconditioned stimulus (US) is a stimulus that elicits a response--known as an unconditioned response--that does not need to be learned by the animal. The relationship between the unconditioned stimulus and unconditioned reponse is known as the unconditioned reflex (or unconditional reflex)