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Related Concept Videos

Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Auditory Perception01:17

Auditory Perception

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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Personal Protective Equipment01:20

Personal Protective Equipment

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Personal protective equipment (PPE) is unique clothing or equipment worn by an employee to minimize or prevent exposure to infectious agents. PPE creates a barrier between the employee and the infectious materials. PPE must be readily available in the patient care area. PPE includes gloves, gowns and aprons, masks and respirators, goggles, face shields, shoes, and headcovers:
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Related Experiment Video

Updated: May 1, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
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Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage

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Do hearing protectors protect hearing?

Matthew R Groenewold1, Elizabeth A Masterson, Christa L Themann

  • 1Surveillance Branch, Division of Surveillance, Hazard Evaluations and Field Studies, National Institute for Occupational Safety and Health (NIOSH), Centers for Disease Control and Prevention (CDC), Cincinnati, Ohio.

American Journal of Industrial Medicine
|April 5, 2014
PubMed
Summary
This summary is machine-generated.

Hearing protection use may not fully prevent workplace hearing loss. Reduced hearing protection use was linked to a higher risk of high-frequency threshold shifts in workers over five years.

Keywords:
hearing protectionnoisenoise-induced hearing lossoccupational hearing loss

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Area of Science:

  • Occupational Health
  • Audiology
  • Industrial Hygiene

Background:

  • Examined the link between self-reported hearing protection use and hearing shifts over 5 years.
  • Investigated incidence of hearing shifts in a large worker cohort.

Purpose of the Study:

  • To assess the effectiveness of hearing protection in preventing noise-induced hearing loss.
  • To analyze the association between hearing protection usage and audiometric changes.

Main Methods:

  • Analyzed audiometric data from 19,911 workers (2005-2009).
  • Utilized OSHA standard threshold shift (OSTS) and high-frequency threshold shift (HFTS) as hearing shift measures.
  • Employed multivariable logistic regression with multi-level modeling to calculate adjusted odds ratios.

Main Results:

  • Nonsignificant odds ratio for OSTS (OR 1.23) comparing never vs. always hearing protection users.
  • Marginally significant odds ratio for HFTS (OR 1.26) for the same comparison.
  • Observed a significant trend of increased HFTS risk with decreased hearing protection use (P=0.02).

Conclusions:

  • Findings raise concerns about hearing protection's efficacy as a sole noise control measure.
  • Suggests that reliance on hearing protection may not be sufficient to prevent noise-induced hearing loss.
  • Highlights the importance of comprehensive noise control strategies in the workplace.