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Related Experiment Videos

Conditioned suppression and variable ratio reinforcement.

D O Lyon, M Felton

    Journal of the Experimental Analysis of Behavior
    |May 1, 1966
    PubMed
    Summary
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    This study investigated conditioned suppression in birds using variable ratio schedules. Results showed that increasing reinforcement requirements minimally impacted suppression, indicating schedule insensitivity.

    Area of Science:

    • Behavioral Psychology
    • Animal Behavior
    • Operant Conditioning

    Background:

    • Conditioned suppression involves a decrease in response rate during a stimulus preceding an unavoidable shock.
    • This phenomenon is studied to understand fear conditioning and its impact on behavior.

    Purpose of the Study:

    • To measure the degree of conditioned suppression in birds under different variable ratio (VR) schedules.
    • To assess the sensitivity of conditioned suppression to variations in reinforcement schedules.

    Main Methods:

    • Three birds were trained on VR schedules with mean reinforcements of 50, 100, and 200 responses.
    • Conditioned suppression was measured by observing response rate changes during a pre-shock stimulus.
    • The duration of the stimulus and shock were kept constant and unavoidable.

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    Main Results:

    • A slight, possibly negligible, decrease in conditioned suppression was observed as VR schedule requirements increased.
    • All tested VR schedules demonstrated general insensitivity to the conditioned suppression procedure.
    • High response rates during the pre-shock stimulus and abrupt rate changes led to variable suppression levels.

    Conclusions:

    • Variable ratio schedules are largely insensitive to conditioned suppression procedures.
    • High response rates and unpredictable changes in behavior complicate the analysis of conditioned suppression.
    • Further research may require modified schedules or procedures to achieve clearer results.