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A case study of monaural diplacusis.

S P Bacon, N F Viemeister

    Hearing Research
    |January 1, 1985
    PubMed
    Summary

    This study examines monaural diplacusis, where pure tones sound rough or beaty. Findings suggest an interaction between external and internal tones, not oto-acoustic emissions.

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    Area of Science:

    • Auditory perception research
    • Psychoacoustics
    • Clinical audiology

    Background:

    • Monaural diplacusis is a rare auditory phenomenon.
    • Characterized by the perception of multiple tones or beats in one ear.
    • Often associated with hearing impairments.

    Observation:

    • A case study of monaural diplacusis is presented.
    • Low-intensity pure tones in a specific frequency range are perceived as rough, multiple, or beating.
    • An aftertone is perceived after certain tones cease.

    Findings:

    • Psychophysical experiments, including simultaneous masking, best beats, and pitch matching, were conducted.
    • Results indicate monaural diplacusis arises from an interaction between an external and an internal tone.
    • The internal tone is not observable as a spontaneous oto-acoustic emission.

    Implications:

    • This research deepens the understanding of auditory processing disorders.
    • Suggests novel diagnostic approaches for diplacusis.
    • Contributes to the study of auditory efferent pathways and internal tone generation.

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