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Related Experiment Videos

Lateralization of jittered tones

J Blauert

    The Journal of the Acoustical Society of America
    |September 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study measured lateralization thresholds for jittered 4-kHz tones, finding results consistent with previous research on various signals. However, thresholds were significantly higher than prior studies, suggesting a peripheral FM-to-AM conversion mechanism.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Signal Processing

    Background:

    • Sound localization relies on interaural time differences (ITDs).
    • Jittered tones and frequency modulation (FM) signals present unique challenges for auditory processing.
    • Previous research established lateralization thresholds for various auditory signals.

    Purpose of the Study:

    • To measure lateralization thresholds for jittered 4-kHz tones based on interaural arrival time differences.
    • To compare these thresholds with existing data for bandpass noise, amplitude modulation (AM), and FM signals.
    • To investigate the underlying mechanisms of sound lateralization for jittered tones, potentially involving peripheral frequency modulation-to-amplitude modulation conversion.

    Main Methods:

    • Psychoacoustic experiments were conducted to determine lateralization thresholds.

    Related Experiment Videos

  • Jittered 4-kHz tones were used as stimuli.
  • Interaural arrival time differences were systematically varied.

    • Main Results:

    • Measured lateralization thresholds for jittered 4-kHz tones align well with previous findings for bandpass noise, AM, and FM signals.
    • Thresholds obtained in this study were notably higher (approximately two orders of magnitude) compared to those reported by Nordmark (1976) for jittered tones.
    • The discrepancy suggests a potential difference in the processing of jittered tones compared to other FM signals.

    Conclusions:

    • The findings support the hypothesis that peripheral frequency modulation-to-amplitude modulation (FM-to-AM) conversion may explain the lateralization of jittered tones and other FM signals.
    • This peripheral conversion mechanism could account for the observed higher lateralization thresholds.
    • Further research is needed to fully elucidate the role of peripheral processing in auditory lateralization of modulated signals.