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Related Concept Videos

Unrenewable Cells00:50

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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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.
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...
Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.

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Related Experiment Video

Updated: May 14, 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

Published on: February 10, 2023

Non-organic hearing loss.

Sarah C Nelson1

  • 15th Regiment Royal Artillery, Catterick. sjones25@doctors.org.uk

Journal of the Royal Army Medical Corps
|February 14, 2013
PubMed
Summary
This summary is machine-generated.

Annual hearing tests revealed severe hearing loss in a young soldier. Investigations diagnosed non-organic hearing loss, likely triggered by psychosocial factors, highlighting the need for early consideration in military primary care.

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Area of Science:

  • Audiology
  • Military Medicine
  • Psychosomatic Medicine

Background:

  • Annual audiograms are mandatory for British Armed Forces personnel.
  • Early detection of hearing impairment is crucial for military readiness and individual well-being.

Observation:

  • A 24-year-old soldier presented with severe hearing deterioration on routine audiogram.
  • No significant noise exposure history was reported, prompting further investigation.

Findings:

  • Extensive audiological assessments over two years led to a diagnosis of non-organic hearing loss.
  • Psychosocial factors were identified as potential triggers for the hearing loss.

Implications:

  • Non-organic hearing loss should be considered early in military primary care evaluations.
  • This diagnosis is particularly relevant in cases of audiometric abnormalities without clear acoustic or otological causes.
  • Integrating psychosocial assessments can improve diagnostic accuracy and patient management in military audiology.