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Auditory dysfunction accompanying noise-induced hearing loss

R C Findlay

    The Journal of Speech and Hearing Disorders
    |August 1, 1976
    PubMed
    Summary
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    Noise exposure in young males can cause subtle hearing loss, impacting speech understanding even with normal low- and midfrequency hearing. This hearing impairment is detectable through specific audiometric tests.

    Area of Science:

    • Audiology
    • Occupational Health
    • Hearing Science

    Background:

    • Noise-induced hearing loss (NIHL) is a significant public health concern.
    • Subtle auditory changes may occur even with normal audiometric thresholds in specific frequencies.
    • Understanding the early effects of noise exposure is crucial for prevention.

    Purpose of the Study:

    • To investigate audiometric differences between young males with a history of noise exposure and normal-hearing controls.
    • To identify specific auditory measures sensitive to early noise-induced auditory changes.

    Main Methods:

    • Comparison of two groups of 16 young males: one with documented noise exposure and hearing loss at 4000 Hz, and a control group with no unusual noise exposure.
    • Assessment using fixed-frequency Bekesy audiometry at 2000 Hz.

    Related Experiment Videos

  • Evaluation of speech discrimination abilities using PB-50 word lists and CID W-22 lists with competing noise.

    • Main Results:

    • A significant difference in Bekesy audiometry tracings (≥5 dB separation) was observed between noise-exposed (12/16 subjects) and non-noise-exposed (1/16 subjects) groups.
    • Significant differences in speech discrimination scores were found between the groups when presented with competing noise.

    Conclusions:

    • Noise exposure can lead to detectable auditory processing deficits, even in individuals with normal low- and midfrequency hearing.
    • Bekesy audiometry and speech discrimination tests in noise are sensitive indicators of early noise-induced auditory changes.