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Related Experiment Videos

Intensity perception. X. Effect of preceding stimulus on identification performance

S R Purks, D J Callahan, L D Braida

    The Journal of the Acoustical Society of America
    |February 1, 1980
    PubMed
    Summary

    Sensitivity in intensity identification experiments is independent of preceding stimulus intensity. Feedback does not improve performance by using prior stimuli as a standard, challenging existing hypotheses about auditory perception.

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    Area of Science:

    • Auditory Perception
    • Psychophysics
    • Signal Detection Theory

    Background:

    • Previous research and listener experiences suggested preceding stimulus intensity influences auditory sensitivity.
    • Intensity-identification tasks commonly employ feedback to enhance performance.

    Purpose of the Study:

    • To investigate the effect of preceding stimulus intensity on performance in an intensity-identification experiment with feedback.
    • To determine if stimulus similarity enhances sensitivity or if other factors are at play.

    Main Methods:

    • Participants performed an intensity-identification task with auditory stimuli.
    • Feedback was provided after each trial.
    • The intensity of the preceding stimulus was systematically varied relative to the current stimulus.

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    Main Results:

    • Sensitivity was found to be independent of the preceding stimulus intensity.
    • Response variance decreased when preceding and current stimulus intensities were close, but this was attributed to sequential effects in response bias.
    • The hypothesis that feedback uses the preceding stimulus as a standard for judgment was not supported.

    Conclusions:

    • The mechanism by which feedback improves sensitivity in auditory identification tasks requires re-evaluation.
    • Sequential effects in response bias, not stimulus similarity, explain reduced response variance.
    • The common hypothesis regarding feedback and stimulus standards in auditory perception is challenged by these findings.