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Related Concept Videos

The Cochlea01:13

The Cochlea

46.8K
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.
46.8K
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...
5.9K
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.
53.7K
Anatomy of the Ear01:16

Anatomy of the Ear

9.1K
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...
9.1K
Hair Cells01:22

Hair Cells

41.8K
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.
41.8K
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

483
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...
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Related Experiment Video

Updated: Oct 5, 2025

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
03:49

Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation

Published on: October 11, 2024

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High-Frequency Cochlear Amplifier Dysfunction: A Dominating Contribution to the Cognitive-Ear Link.

Yao Wang1,2, Xiao Li3,4, Fuxin Ren3,4

  • 1School of Life Sciences, Tiangong University, Tianjin, China.

Frontiers in Aging Neuroscience
|January 24, 2022
PubMed
Summary
This summary is machine-generated.

High-frequency cochlear dysfunction directly predicts cognitive decline in older adults. This auditory impairment significantly contributes to the cognitive-ear link, impacting memory, attention, and processing speed.

Keywords:
cognitive declinecognitive-ear linkhigh-frequency cochlear amplifier dysfunctionpresbycusisrisk factor

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Area of Science:

  • Audiology
  • Neuroscience
  • Gerontology

Background:

  • Hearing loss, particularly in older adults (presbycusis), is increasingly recognized as a potential contributor to cognitive decline.
  • The precise mechanisms linking auditory function to cognitive performance, especially concerning high-frequency hearing, require further elucidation.

Purpose of the Study:

  • To investigate the role of high-frequency cochlear dysfunction in the relationship between hearing and cognitive function.
  • To determine if high-frequency auditory function directly predicts cognitive impairment.

Main Methods:

  • Seventy-four presbycusis patients and 71 normal hearing controls underwent comprehensive cognitive and auditory testing.
  • Auditory tests included distortion product otoacoustic emissions (DPOAE) and pure-tone (PT) thresholds.
  • Cognitive assessments utilized the Montreal Cognitive Assessment (MoCA), Stroop, SDMT, AVLT, and Trail-Making Tests (TMT-A/B).

Main Results:

  • High-frequency DPOAE (H-DPOAE) was significantly correlated with multiple cognitive domains in the presbycusis group.
  • H-DPOAE effectively predicted cognitive impairment in memory, attention, processing speed, and executive function.
  • H-DPOAE directly impacted cognition and fully mediated the association between pure tone average (PTA)/speech reception threshold (SRT) and cognitive scores.

Conclusions:

  • High-frequency cochlear amplifier dysfunction has a direct predictive effect on cognitive decline.
  • Auditory dysfunction, specifically at high frequencies, significantly contributes to the cognitive-ear link.
  • Targeting high-frequency hearing may be crucial for mitigating cognitive decline in aging populations.