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Some systematic observations on monaural diplacusis

C Formby, D B Gjerdingen

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1981
    PubMed
    Summary
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    This study maps pitch perception anomalies in the intensity-frequency plane. Internal tones, related to pitch abnormalities, align with a specific region of rapid threshold adaptation in hearing.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics

    Background:

    • Monaural pitch perception can exhibit anomalies such as level-dependent pitch shifts, roughness, and beats.
    • Understanding these perceptual phenomena is crucial for diagnosing auditory processing disorders.

    Purpose of the Study:

    • To map anomalies in monaural pitch perception within the intensity-frequency plane.
    • To investigate the relationship between internally generated tones and regions of auditory adaptation.
    • To explore the underlying mechanisms of pitch abnormalities.

    Main Methods:

    • Continuous-tone stimulation was used to map pitch anomalies in the intensity-frequency plane (1900–2750 Hz).
    • A specific region of rapid threshold adaptation was identified (2590–2690 Hz).
    • Listeners localized internally generated tones by adjusting signal frequency to match a criterion beat rate.

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    Main Results:

    • A region of rapid threshold adaptation was identified between 2590 and 2690 Hz.
    • The perceived location of internal tones corresponded to the boundaries of this adaptation region.
    • Pitch changes below the adaptation region indicated a shift from signal interaction to cessation of interaction.

    Conclusions:

    • Internal tone perception is predictably linked to the frequency boundaries of auditory adaptation regions.
    • Pitch abnormalities arise from interactions between auditory signals and specific frequency regions with abrupt sensitivity changes.
    • These findings provide insights into the neural basis of pitch perception and its anomalies.