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Related Experiment Videos

Hazard from an intense midrange impulse.

G R Price1, S Wansack

  • 1U.S. Army Human Engineering Laboratory, Aberdeen Proving Ground, Maryland 21005-5001.

The Journal of the Acoustical Society of America
|December 1, 1989
PubMed
Summary
This summary is machine-generated.

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The cat ear is most vulnerable to impulse noise when its spectral peak is near 4 kHz. This study confirms this, showing significant hearing loss at this frequency even at lower sound pressure levels.

Area of Science:

  • Auditory Science
  • Acoustics
  • Otoacoustic Emissions

Background:

  • Existing damage-risk criteria for impulse noise do not align with the hypothesis of peak susceptibility at 4 kHz.
  • Previous experiments supported this hypothesis for lower frequency impulses, but not at the predicted peak susceptibility frequency.

Purpose of the Study:

  • To test the hypothesis that the ear's susceptibility to impulse noise is greatest when the impulse's spectral peak is near the ear's best frequency (4 kHz).
  • To determine the threshold and growth rate of hearing loss from impulses with a spectral peak at 4 kHz.

Main Methods:

  • Cats were exposed to 50 primer explosion impulses (4 kHz spectral peak) at peak levels of 135, 140, or 145 dB.
  • Auditory thresholds were measured electrophysiologically using tone pips at 2, 4, 8, and 16 kHz.

Related Experiment Videos

  • Hearing loss was assessed immediately post-exposure and after 2 months.

    • Main Results:

    • Hearing losses were greatest at 4 kHz.
    • Threshold shifts began at 134 dB peak pressure.
    • Immediate hearing loss increased by approximately 7 dB for every 1 dB increase in peak pressure.
    • About 50% of the immediate hearing loss became permanent.
    • The energy required for permanent threshold shift was significantly lower (0.07 J/m2) than for continuous noises.

    Conclusions:

    • The experimental data support the hypothesis of increased ear susceptibility to impulse noise when the spectral peak is near 4 kHz.
    • The findings challenge current damage-risk criteria for impulse noise, suggesting a need for revision.
    • The study highlights the potential for significant and permanent hearing damage from mid-frequency impulses at relatively low energy levels.