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Related Experiment Videos

Conditioned suppression with extinction as the signalled stimulus.

P W Holmes

    Journal of the Experimental Analysis of Behavior
    |July 1, 1972
    PubMed
    Summary

    Pigeons stopped pecking for food when a warning signal predicted a period without rewards. This behavior persisted even when the signal

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    Area of Science:

    • Behavioral psychology
    • Animal behavior studies
    • Operant conditioning

    Background:

    • Pigeons were trained to peck keys for food rewards on a random-interval schedule.
    • Understanding how animals respond to predictable aversive stimuli is crucial.

    Purpose of the Study:

    • To investigate the suppressive effects of a warning stimulus that signals an upcoming extinction period on established key-pecking behavior in pigeons.

    Main Methods:

    • Pigeons' key-pecking behavior, maintained by a 60-sec random-interval schedule of food reinforcement, was observed.
    • A variable-duration warning stimulus was introduced, signaling a 5-min extinction period.
    • The extinction period commenced immediately after the warning stimulus, irrespective of the pigeon's actions.

    Main Results:

    • The warning stimulus significantly suppressed key-pecking behavior in all pigeons.
    • Nearly complete suppression of responding was observed during the warning stimulus across all subjects.
    • The suppression indicates a learned association between the warning signal and the absence of reinforcement.

    Conclusions:

    • A warning stimulus predicting non-reinforcement can effectively suppress ongoing operant behavior.
    • Pigeons can learn to anticipate and alter their behavior in response to predictive cues for reward withdrawal.

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