"In classical conditioning, a UR is an event that occurs naturally (such as salivation), in response to some stimulus. A US is something that naturally and automatically (without learning) triggers the unlearned response (as food in the mouth triggers salivation). A CS is a previously irrelevant stimulus (such as a bell) that, through learning, comes to be associated with some unlearned response (salivating). A CR is the learned response (salivating) to the originally irrelevant but now conditioned stimulus."
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