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Related Experiment Videos

Marking effects in instrumental performance on DRH schedules.

P Reed

    The Quarterly Journal of Experimental Psychology. B, Comparative and Physiological Psychology
    |November 1, 1989
    PubMed
    Summary

    Brief stimuli after responses enhance lever-pressing rates in rats under differential reinforcement of high rate (DRH) schedules. These signals may improve memory and instrumental performance by marking response sequences.

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    Area of Science:

    • Behavioral neuroscience
    • Animal behavior research
    • Learning and memory

    Background:

    • Differential reinforcement of high rate (DRH) schedules are used to study response rate control.
    • The role of external stimuli in modulating instrumental performance requires further investigation.
    • Understanding factors that enhance response rates is crucial for behavioral pharmacology and neuroscience.

    Purpose of the Study:

    • To investigate the effect of brief stimuli presented after response sequences on rat lever-pressing rates under DRH schedules.
    • To determine if these stimuli enhance performance by marking response sequences in memory.
    • To explore the conditions under which stimulus presentation influences instrumental responding.

    Main Methods:

    • Three experiments utilized rats trained on various DRH and multiple DRH schedules.
    • Stimuli were presented following response sequences, sometimes paired with reinforcement, sometimes not.
    • Response rates were measured under conditions with and without stimulus presentation.

    Main Results:

    • A visual stimulus during a reinforcement delay enhanced responding compared to no stimulus.
    • Stimuli presented after non-reinforced components in a multiple schedule also enhanced responding.
    • Brief stimuli elevated response rates regardless of pairing with reinforcement in a second-order schedule.

    Conclusions:

    • Brief stimuli presented after response sequences can enhance instrumental performance.
    • These findings support the hypothesis that stimuli can serve as memory markers for response sequences.
    • The results have implications for understanding the neural mechanisms of reinforcement and memory consolidation.

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