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A procedure for detecting variability of psychophysical thresholds.

J L Hall

    The Journal of the Acoustical Society of America
    |February 1, 1983
    PubMed
    Summary

    This study introduces a screening method to detect changes in a subject's threshold during adaptive psychophysical testing. A significant slope in the regression of response discrepancies indicates unstable performance.

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    Area of Science:

    • Psychology
    • Psychophysics
    • Statistics

    Background:

    • Identifying threshold changes during adaptive psychophysical testing is crucial but challenging.
    • Testing levels fluctuate within a run, complicating stability assessment.

    Purpose of the Study:

    • To present a screening procedure for detecting threshold variability in psychophysical testing.
    • To offer a method for identifying experimental runs with changing subject thresholds.

    Main Methods:

    • Calculate trial-by-trial discrepancies between observed and expected responses post-run.
    • Perform a linear regression of these discrepancies against trial number.
    • Analyze the slope of the regression to infer response stability.

    Main Results:

    • A slope significantly different from zero suggests unstable subject response behavior.
    • The expected slope is zero when response behavior is stable and psychometric functions are accurate.
    • Computer simulations and psychophysical experiments validate the procedure.

    Conclusions:

    • The proposed screening procedure effectively detects threshold variability.
    • This method aids in identifying unreliable runs in adaptive psychophysical testing.
    • It provides a statistical basis for assessing response stability.

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