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Reinforcement for errors in a signal-detection procedure.

M Davison, D McCarthy

    Journal of the Experimental Analysis of Behavior
    |July 1, 1980
    PubMed
    Summary
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    Pigeons trained on signal detection learned to associate stimulus duration with key pecks for food. Increasing reinforcement for errors, however, decreased correct responses, demonstrating a matching law in detection performance.

    Area of Science:

    • Behavioral science
    • Animal cognition
    • Psychophysics

    Background:

    • Signal detection theory (SDT) is a framework for understanding how individuals make decisions under uncertainty.
    • Reinforcement schedules significantly influence animal behavior and decision-making processes.
    • Previous research has explored the impact of reinforcement on discrimination tasks, but the specific effects of error reinforcement in signal detection require further elucidation.

    Purpose of the Study:

    • To investigate the effect of reinforcement probability for errors on pigeons' signal detection performance.
    • To test the applicability of a matching model to explain detection performance based on stimulus discriminability and reinforcement association.
    • To evaluate the model's fit with current experimental data and previously published findings.

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    Main Methods:

    • Six pigeons were trained using a signal-detection procedure with two distinct stimulus durations (5-second and 10-second white lights).
    • Correct responses (left key for 5s, right key for 10s) were reinforced with food at a probability of 0.7.
    • Error reinforcement probability was systematically increased across nine experimental conditions, while correct response reinforcement remained constant.

    Main Results:

    • The percentage of correct responses significantly decreased as the probability of reinforcement for errors increased.
    • A matching model, incorporating stimulus discriminability and reinforcement association, accurately predicted the observed detection performance.
    • The model also demonstrated a strong fit with two sets of previously published data on signal detection and operant performance.

    Conclusions:

    • Reinforcement of errors negatively impacts signal detection accuracy in pigeons.
    • A matching model effectively describes detection performance as a function of stimulus properties and reinforcement contingencies.
    • This approach provides a generalized measure of discriminability and predictive power for complex behaviors.