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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Letter to the Editor: An Alternative Interpretation of Issues Surrounding the Exchange Rates Re: Dobie, R.A., & Clark, W.W. (2014) Exchange Rates for Intermittent and Fluctuating Occupational Noise: A Systematic Review of Studies of Human Permanent Threshold Shift, Ear Hear, 35, 86-96.

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Occupational Hearing Loss from Non-Gaussian Noise.

Alice H Suter1

  • 1Alice Suter and Associates, Portland, Oregon.

Seminars in Hearing
|July 26, 2017
PubMed
Summary
This summary is machine-generated.

Intermittent, non-Gaussian noise may not protect hearing as previously assumed. Recent research supports a more conservative 3-decibel exchange rate for noise exposure limits to better conserve hearing.

Keywords:
Noisehearing lossnon-Gaussian noiseoccupational hearing loss

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Area of Science:

  • Auditory science
  • Occupational health
  • Noise toxicology

Background:

  • Noise exposure in occupations is often intermittent and non-Gaussian, not normally distributed.
  • The 5-dB exchange rate (ER) for noise exposure assumes intermittent noise affects the ear differently than continuous noise, a long-debated topic.
  • Previous research suggested intermittency might mitigate noise damage, supporting the 5-dB ER.

Purpose of the Study:

  • To explore the effects of non-Gaussian noise on the auditory system.
  • To re-evaluate the 3-dB vs. 5-dB exchange rate (ER) for noise exposure based on recent scientific findings.
  • To assess the validity of assumptions regarding the protective effects of intermittent noise.

Main Methods:

  • Review and analysis of existing scientific literature, including animal research on noise exposure.
  • Comparison of findings from earlier reports with recent studies on complex noise and auditory synapse damage.
  • Evaluation of the relevance of animal noise exposure models to real-world working conditions.

Main Results:

  • Some animal research suggested a mitigating effect of intermittency, but often used unrealistic exposure conditions.
  • More recent animal research indicates that intermittencies do not protect the cochlea from noise damage.
  • Advancements in microscopy reveal noise-induced damage to auditory synapses at levels previously considered safe.

Conclusions:

  • The assumption that intermittency protects the ear is increasingly invalidated by recent research.
  • A more conservative 3-dB exchange rate (ER) is supported for assessing noise-induced hearing loss.
  • Findings suggest a need for more conservative noise assessment and hearing conservation programs.