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(in psychology) a stimulus that, when presented immediately after occurrence of a particular behavior, will decrease the rate of occurrence of the behavior.
re·in·for·cer , positive reinforcer , negative reinforcer (rē'in-fōrs'ĕr, pozi-tiv, negă-tiv)
In conditioning, a pleasant or satisfaction-yielding (positive reinforcer) or painful or unsatisfying (negative reinforcer) stimulus, object, or stimulus event that is obtained upon the performance of a desired or predetermined operant.
See also: reinforcement