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Related Concept Videos

Hearing01:31

Hearing

55.1K
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.
55.1K
The Cochlea01:13

The Cochlea

48.5K
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.
48.5K
Auditory Pathway01:15

Auditory Pathway

6.3K
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...
6.3K
Anatomy of the Ear01:16

Anatomy of the Ear

9.8K
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...
9.8K
Auditory Perception01:17

Auditory Perception

773
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...
773
Hair Cells01:22

Hair Cells

43.0K
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.
43.0K

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Related Experiment Video

Updated: Nov 12, 2025

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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What's been hidden in hidden hearing loss.

Hari Bharadwaj1, Barbara Shinn-Cunningham2

  • 1Department of Speech, Language, and Hearing Sciences and Weldon School of Biomedical Engineering, Purdue University, Lyles-Porter Hall, room 3162, West Lafayette, IN 47907, USA.

Neuron
|March 18, 2021
PubMed
Summary

Cochlear neurodegeneration may not solely cause hearing loss through poor signal coding. Instead, altered brain activity in noisy environments appears to be the main reason for hearing difficulties.

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Related Experiment Videos

Last Updated: Nov 12, 2025

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Simple Surgical Induction of Conductive Hearing Loss with Verification Using Otoscope Visualization and Behavioral Clap Startle Response in Rat
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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Neurodegenerative Diseases

Background:

  • Previous research on cochlear neurodegeneration and hearing loss focused on impaired sensory input coding.
  • These studies yielded inconsistent results regarding the primary mechanisms of hearing impairment.

Purpose of the Study:

  • To investigate the role of altered brain dynamics in noise-induced hearing difficulties.
  • To challenge the traditional view of impoverished input coding as the sole driver of hearing loss in neurodegeneration.

Main Methods:

  • The study analyzed human participants with potential cochlear neurodegeneration.
  • Investigated brain activity patterns in response to auditory stimuli, particularly in noisy conditions.

Main Results:

  • Findings suggest that altered neural dynamics in the presence of background noise are more closely linked to hearing difficulties than previously thought.
  • This indicates a shift in understanding the immediate causes of impaired hearing.

Conclusions:

  • Altered brain dynamics in noise, rather than just impoverished input coding, are identified as the proximal cause of hearing difficulties associated with cochlear neurodegeneration.
  • This highlights the importance of neural processing in noisy environments for auditory perception.