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Interaural octave phase-shift detection and aural harmonic distortion.

T J Ayres, T D Clack

    The Journal of the Acoustical Society of America
    |August 1, 1984
    PubMed
    Summary
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    Listeners detected interaural phase shifts using specific tones. Adding a subaudible tone influenced detection, supporting the aural harmonic distortion hypothesis in auditory perception.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Signal Processing

    Background:

    • Interaural phase differences (IPDs) are crucial for sound localization.
    • The perception of complex auditory stimuli can be influenced by non-linear processes within the auditory system.

    Purpose of the Study:

    • To investigate the detectability of interaural phase shifts under specific auditory conditions.
    • To explore the influence of a subaudible continuous tone on interaural phase shift detection.
    • To evaluate the consistency of the findings with the aural harmonic distortion hypothesis.

    Main Methods:

    • Dichotic presentation of a continuous 400-Hz tone and 800-Hz tone bursts.
    • Varying sound pressure levels (SPL) and sensation levels (SL) for the tones.

    Related Experiment Videos

  • Introduction of a subaudible continuous 800-Hz tone with controlled phase relations.

    • Main Results:

    • Four out of nine listeners detected a 180-degree interaural phase shift for the primary tones.
    • Detection of the interaural phase shift was modulated by the phase of the added subaudible tone relative to the 400-Hz tone.
    • The observed effects were consistent with predictions derived from the aural harmonic distortion model.

    Conclusions:

    • Aural harmonic distortion plays a role in the perception of interaural phase shifts.
    • The auditory system exhibits non-linear processing that affects binaural hearing.
    • Further research into auditory distortion products can elucidate mechanisms of sound perception.