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Related Experiment Videos

Threshold-duration function of the acoustic reflex in man.

C Woodford, D Henderson, R Hamernik

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1975
    PubMed
    Summary

    The acoustic reflex threshold-duration function in normal hearing individuals spans a wider intensity range than auditory temporal integration. Sex differences and cochlear hearing loss truncate this function, impacting clinical measurements.

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    Area of Science:

    • Audiology
    • Neuroscience
    • Hearing Science

    Background:

    • The acoustic reflex is a crucial auditory response.
    • Understanding its temporal dynamics is vital for hearing assessment.
    • Previous research has not fully elucidated the threshold-duration function across various frequencies and durations.

    Purpose of the Study:

    • To investigate the threshold-duration function of the acoustic reflex in normal-hearing adults.
    • To compare this function with psychophysical auditory temporal integration.
    • To examine the influence of sex and cochlear hearing loss on the acoustic reflex threshold-duration function.

    Main Methods:

    • Measured acoustic reflex thresholds across stimulus durations (10-500 ms) and frequencies (500-4000 Hz) in normal-hearing and hearing-impaired subjects.

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  • Utilized three commercial acoustic bridges (Madsen ZO-70, Grason-Stadler 1720, Grason-Stadler-Zwislocki model 3).
  • Employed a 220 Hz probe-tone frequency for all measurements.

    • Main Results:

    • The reflex threshold-duration function in normal-hearing subjects showed a broader intensity range compared to auditory temporal integration.
    • A significant sex difference was observed, potentially linked to subclinical noise-induced cochlear pathology in males.
    • The function was truncated in subjects with hearing loss of cochlear etiology.

    Conclusions:

    • The acoustic reflex threshold-duration function is more extensive than psychophysical temporal integration.
    • Subclinical cochlear pathology may influence the male acoustic reflex function.
    • Clinical measurement of acoustic reflexes should consider stimulus duration, especially in populations with hearing loss.