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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.
Learner's definition of EXTINCTION. : the state or situation that results when something (such as a plant or animal species) has died out completely. [noncount]. the extinction of all life in the region. Several bird species are threatened with extinction. = Several bird species are on the brink of extinction.