Ivan Pavlov – Classical Conditioning

Classical conditioning (also Pavlovian conditioning or respondent conditioning) is a form of learning in which the conditioned stimulus or CS, comes to signal the occurrence of a second stimulus, the unconditioned stimulus or US. (A stimulus is a factor that causes a response in an organism.) The conditioned response is the learned response to the previously neutral stimulus. The US is usually a biologically significant stimulus such as food or pain that elicits a response from the start; this is called the unconditioned response or UR. The CS usually produces no particular response at first, but after conditioning it elicits the conditioned response or CR. Classical conditioning differs from operant or instrumental conditioning, in which behavior emitted by the subject is strengthened or weakened by its consequences (i.e. reward or punishment).Source: http://en.wikipedia.org/wiki/Classical_conditioning

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