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Interrupted noise exposures: threshold shift dynamics and permanent effects

R P Hamernik1, W A Ahroon

  • 1State University of New York at Plattsburg, New York 12901, USA. HamernRP@SPLAVA.CC.PLATTSBURGH.EDU

The Journal of the Acoustical Society of America
|June 24, 1998
PubMed
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Noise exposure can cause temporary threshold shift (TTS) toughening, but this effect does not protect the auditory system from permanent noise-induced hearing loss. Differences in permanent effects are due to exposure duration, not toughening.

Area of Science:

  • Auditory Science
  • Otoacoustic Emissions
  • Noise-Induced Hearing Loss

Background:

  • Interrupted noise exposure can lead to temporary threshold shift (TS) toughening.
  • The protective mechanisms and limitations of this toughening phenomenon are not fully understood.
  • Understanding these effects is crucial for developing effective hearing protection strategies.

Purpose of the Study:

  • To parametrically investigate the reduction of threshold shift (toughening phenomena) during interrupted noise exposure.
  • To determine how noise frequency, intensity, and exposure duration influence toughening.
  • To assess whether toughening protects the auditory system from permanent noise-induced damage.

Main Methods:

  • 266 chinchillas were exposed to various 400-Hz narrow-band impact noises (0.5-8.0 kHz, 109-127 dB SPL) for 5 days (24 h/d) or 20 days (6 h/d).

Related Experiment Videos

  • Group mean noise effects were measured using inferior colliculus evoked potentials and surface preparation histology.
  • Threshold shift (TS) was measured at all audiometric test frequencies.

    • Main Results:

    • Toughening phenomena occurred in response to all stimuli that produced a TS, across all test frequencies.
    • The magnitude of toughening was limited to less than 35 dB and varied with noise frequency and intensity.
    • No evidence suggests that toughening protects the auditory system from permanent noise-induced effects.

    Conclusions:

    • Toughening is a real phenomenon but offers limited protection against permanent noise-induced hearing loss.
    • Differences in permanent effects between shorter (5-day) and longer (20-day) exposures are attributed to the spreading of exposure energy over time.
    • Further research is needed to elucidate the precise mechanisms and implications of toughening in auditory adaptation.