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Related Concept Videos

Sound Intensity Level00:53

Sound Intensity Level

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.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
Hearing01:31

Hearing

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.
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...
Auditory Pathway01:15

Auditory Pathway

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 the...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Related Experiment Video

Updated: May 15, 2026

Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage
07:13

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

Published on: February 10, 2023

Noise-induced hearing loss.

Mariola Sliwinska-Kowalska1, Adrian Davis

  • 1Department of Audiology and Phoniatrics, Nofer Institute of Occupational Medicine, Lodz, Poland.

Noise & Health
|December 22, 2012
PubMed
Summary

Noise-induced hearing loss (NIHL) remains a concern, especially from social noise in young people. Recent research offers promising therapies to protect hearing from acoustic trauma.

Area of Science:

  • Audiology
  • Occupational Health
  • Public Health

Background:

  • Noise-induced hearing loss (NIHL) persists despite regulations and awareness campaigns.
  • Research focuses on NIHL risks in entertainment (musicians) and challenging occupations (farming, construction).
  • Social noise exposure has tripled among young people, increasing hearing loss risk.

Purpose of the Study:

  • To review recent advancements (2008-2011) in understanding NIHL.
  • To explore the mechanisms, genetics, and otoprotective strategies for NIHL.
  • To highlight the need for improved noise exposure policies and risk assessment.

Main Methods:

  • Literature search of medical and relevant databases for English papers (2008-2011).
  • Analysis of research on NIHL in occupational and social settings.

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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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  • Review of studies on acoustic trauma pathomechanisms, genetics, and otoprotection.

    • Main Results:

    • Significant research on NIHL in professional musicians and high-risk occupations.
    • Identification of social noise sources (concerts, personal music players) posing risks to young adults.
    • Advances in understanding NIHL genetics and promising otoprotective therapies (dietary, pharmacologic).

    Conclusions:

    • NIHL remains a significant public health issue, particularly for young people exposed to social noise.
    • Emerging research on pathomechanisms, genetics, and otoprotection offers hope for preventing hearing loss.
    • Enhanced noise exposure policies and risk assessment are crucial for hearing protection.