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Improving psychoacoustical tuning curves

B J O'Loughlin, B C Moore

    Hearing Research
    |November 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Off-frequency listening allows subjects to use neurons away from the probe frequency, explaining tuning curve discrepancies. Limiting this phenomenon brings psychoacoustical and neurophysiological data into close agreement.

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    Area of Science:

    • Auditory neuroscience
    • Psychoacoustics

    Background:

    • Psychoacoustical tuning curves (PTCs) often show broader tuning than neurophysiological tuning curves.
    • This discrepancy suggests mechanisms beyond simple neural tuning influence auditory perception.

    Purpose of the Study:

    • To investigate the role of "off-frequency listening" in explaining the difference between psychoacoustical and neurophysiological tuning.
    • To determine if limiting off-frequency listening can reconcile these two measures of auditory tuning.

    Main Methods:

    • Psychoacoustical experiments using forward masking to obtain tuning curves.
    • Introduction of band-reject noise centered on the probe frequency to inhibit off-frequency listening.
    • Comparison of modified psychoacoustical tuning curves with existing neurophysiological data.

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    Main Results:

    • Subjects utilize "off-frequency listening," engaging neurons with characteristic frequencies distant from the probe frequency.
    • This off-frequency listening contributes significantly to the broader tuning observed in traditional PTCs.
    • Adding band-reject noise to suppress off-frequency listening resulted in PTCs closely matching neurophysiological tuning curves.

    Conclusions:

    • Off-frequency listening is a key factor in the broader tuning of psychoacoustical measures compared to neurophysiological ones.
    • Manipulating listening strategies, specifically by limiting off-frequency listening, can align perceptual and neural measures of auditory tuning.