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Related Experiment Videos

Operant acceleration during a pre-reward stimulus.

W W Henton, J V Brady

    Journal of the Experimental Analysis of Behavior
    |March 1, 1970
    PubMed
    Summary
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    Longer food-predicting stimuli increased lever pressing in rhesus monkeys. Response rates returned to baseline when food was removed, showing the stimulus-termination contingency was key for increased behavior.

    Area of Science:

    • Behavioral neuroscience
    • Animal behavior

    Background:

    • Operant conditioning principles govern learned behaviors.
    • Stimulus control and reinforcement schedules are critical in shaping behavior.

    Purpose of the Study:

    • To investigate the effect of stimulus duration and food-pellet termination on lever pressing in rhesus monkeys.
    • To examine the role of non-response-contingent reinforcement in modulating behavior under a differential reinforcement of low rates (DRL) schedule.

    Main Methods:

    • Two rhesus monkeys were trained on a DRL 30-sec schedule for lever pressing.
    • Stimuli of varying durations (20, 40, 80 seconds) followed by non-contingent food pellets were introduced.
    • Response frequency and interresponse times were recorded and analyzed.

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    Main Results:

    • The 80-second stimulus significantly increased response frequency and shortened interresponse times.
    • These changes diminished when the 80-second stimulus was no longer paired with food.
    • Reinstating the food-termination contingency restored the increased response rate and shorter interresponse times.

    Conclusions:

    • Behavioral responses are sensitive to the duration of predictive stimuli.
    • The contingency between stimulus termination and reinforcement is crucial for maintaining enhanced responding.
    • DRL schedule performance remained stable, indicating specific modulation by the stimulus-reinforcement procedure.