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Related Experiment Videos

Lateralization and frequency selectivity in normal and impaired hearing.

S Buus, B Scharf, M Florentine

    The Journal of the Acoustical Society of America
    |July 1, 1984
    PubMed
    Summary

    Listeners with hearing loss can localize sounds using onset envelope differences, but struggle with fine temporal cues. This research explores auditory lateralization in normal and impaired hearing.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Hearing Science

    Background:

    • Sound localization relies on interaural time and level differences.
    • Binaural hearing and frequency selectivity are crucial for precise sound localization.

    Purpose of the Study:

    • To investigate the relationship between frequency difference and the onset-time difference required for sound lateralization.
    • To assess the impact of cochlear impairments on auditory lateralization abilities.

    Main Methods:

    • Measured onset-time difference (delta T) for lateralizing 30-ms bifrequency tone bursts.
    • Varied frequency difference (delta F) at center frequencies of 0.5, 1, and 4 kHz.
    • Tested normal-hearing and cochlear-impaired listeners at various sound pressure levels (SPL).

    Main Results:

    • Normal listeners showed constant delta T at subcritical delta Fs, increasing beyond the critical band.
    • At 1 kHz, delta T increased with delta F even at subcritical frequencies for normal listeners.
    • Cohear-impaired listeners demonstrated normal lateralization at 4 kHz but impaired functions at lower frequencies, correlating with hearing loss severity.

    Conclusions:

    • Listeners with moderate to severe hearing loss can lateralize sounds using interaural onset envelope differences.
    • Fine temporal structure processing for lateralization is significantly affected by cochlear impairments.
    • Auditory lateralization abilities depend on the spectral characteristics of the sound and the degree of hearing loss.

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