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Hearing

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 Intensity Level

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...

Auditory Pathway

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...

Perception of Sound Waves

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...

Perceiving Loudness, Pitch, and Location

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...

Unrenewable Cells

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...

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Related Experiment Video

Updated: Jun 15, 2026

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

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

[Hearing damage caused by noise].

A P Milovanović¹, V B Djukić, J P Milovanović

¹Institut za medicinu rada Srbije "Dr Dragomir Karajović".

Acta Chirurgica Iugoslavica

|March 12, 2010

Summary

Occupational hearing loss is a significant risk, particularly in the metal and mining industries. Regular medical check-ups and protective measures are crucial for preventing noise-induced hearing damage in workers.

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Last Updated: Jun 15, 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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Published on: February 10, 2023

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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Area of Science:

Occupational health and safety
Audiology
Epidemiology

Context:

Noise exposure is a prevalent occupational hazard leading to hearing loss.
Established industrial noise limits are typically 85 dB.
Professional hearing damage is a recognized occupational disease.

Purpose:

To determine the prevalence of recognized occupational diseases in the country.
To identify industries with the highest incidence of noise-induced hearing damage.
To analyze patient histories of individuals with diagnosed occupational hearing loss.

Summary:

A cohort study analyzed patients hospitalized for occupational hearing loss.
The average age of affected workers was 50, with extensive exposure histories.
Peak cases were detected in 2003-2004, primarily among metal and mining industry workers, with over half experiencing 30-40% hearing lesion.

Impact:

Highlights the necessity of regular medical examinations for workers, especially in high-risk industries.
Emphasizes the importance of personal protective equipment and medical education for prevention.
Provides data supporting targeted interventions in industries like metal and mining to mitigate occupational hearing loss.