Abstract
Pigeons with a past history of key pecking for an auditory conditioned rein forcer (tone) in one component of a multiple schedule, while the conditioned and primary rein forcers were paired in another component, were put on an extinction schedule in which key pecking no longer produced the tone. The key pecking persisted in the absence of the tone but ceased when the discriminative stimulus (red key light) was replaced with a novel stimulus (yellow key light).
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