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Discrimination of dynamic interaural intensity differences.

D W Grantham

    The Journal of the Acoustical Society of America
    |July 1, 1984
    PubMed
    Summary
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    This study shows the human auditory system is better at detecting changes in sound intensity between ears (interaural intensity differences) than changes in timing (interaural time differences). Sensitivity varies with modulation frequency.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Signal Processing

    Background:

    • Interaural cues, such as interaural intensity differences (IIDs) and interaural time differences (ITDs), are crucial for sound localization and binaural hearing.
    • The ability of the auditory system to process dynamic changes in these binaural cues is not fully understood, particularly for IIDs.

    Purpose of the Study:

    • To investigate human observers' ability to detect time-varying interaural intensity differences (IIDs).
    • To compare the efficiency of processing dynamic IIDs versus dynamic ITDs.

    Main Methods:

    • A two-interval forced-choice task was used to measure detection thresholds for amplitude-modulated (AM) noise with varying IIDs.
    • The carrier signal was narrow-band noise (500, 1000, or 4000 Hz) at 75 dB SPL for 1.0 s.

    Related Experiment Videos

  • An adaptive procedure estimated the modulation depth (mthr) required for 71% discriminability at different modulation frequencies (fm).

    • Main Results:

    • Observers showed "low-pass" modulation functions, with detection thresholds increasing as modulation frequency increased, especially at 500 Hz.
    • Sensitivity to IID was generally higher at 1000 and 4000 Hz compared to 500 Hz, with flatter functions.
    • Detection of dynamic IIDs was more efficient than previously reported detection of dynamic ITDs.

    Conclusions:

    • The binaural system demonstrates a greater capacity for processing fluctuations in IID compared to ITD.
    • Significant individual differences exist in the ability to process both IID and ITD cues.
    • These findings contribute to understanding the temporal processing capabilities of the human auditory system for binaural cues.