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Extinction is observed in both operantly conditioned and classically conditioned behavior. When operant behavior that has been previously reinforced no longer produces reinforcing consequences the behavior gradually stops occurring.
(Ä­k-stÄ­ngk'shÉn) The fact of being extinct or the process of becoming extinct. See more at background extinction, mass extinction. A progressive decrease in the strength of a conditioned response, often resulting in its elimination, because of withdrawal of a specific stimulus.