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Related Experiment Videos

Local response-rate constancy on concurrent variable-interval schedules of reinforcement.

S S Pliskoff, R Cicerone, T D Nelson

    Journal of the Experimental Analysis of Behavior
    |May 1, 1978
    PubMed
    Summary

    Pigeons demonstrated matching-to-sample behavior under concurrent variable-interval schedules, showing a tendency toward overmatching. Changeover delays, compared to fixed ratios, increased response rates on the main key.

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    Area of Science:

    • Behavioral psychology
    • Operant conditioning

    Background:

    • Concurrent variable-interval (VI) schedules are used to study choice behavior.
    • Matching law describes response allocation between concurrent schedules.
    • Changeover mechanisms influence response patterns.

    Purpose of the Study:

    • Investigate matching behavior in pigeons under concurrent VI schedules.
    • Examine the effects of different changeover procedures on response allocation and rates.
    • Analyze local response rates and interresponse times in relation to schedule parameters.

    Main Methods:

    • Concurrent schedules with alternating main key colors and VI assignments were used.
    • A changeover key required a small fixed ratio (FR) for response switching.
    • Experiment 1: Assessed matching and local rates with unequal VI schedules.

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  • Experiment 2: Compared changeover delay (COD) with FR changeover procedures.

    • Main Results:

    • Pigeons showed acceptable matching but a tendency toward overmatching in Experiment 1.
    • Local response rates were higher for VI schedules with shorter interreinforcement intervals.
    • Response output on the main key was greater with COD than with FR changeover.
    • A 2-second COD increased response rate for 3 seconds post-changeover, unlike FR.

    Conclusions:

    • Concurrent VI schedules can produce matching, though overmatching may occur.
    • Changeover procedures significantly impact response allocation and local response rates.
    • Changeover delays appear more effective than fixed ratios in maintaining response output.