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Related Concept Videos

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.
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...
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.
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...
Hair Cells01:22

Hair Cells

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.
Difference from Background: Limit of Detection01:05

Difference from Background: Limit of Detection

The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...

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Related Experiment Video

Updated: May 18, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
09:44

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Diminished temporal coding with sensorineural hearing loss emerges in background noise.

Kenneth S Henry1, Michael G Heinz

  • 1Department of Speech, Language and Hearing Sciences, Purdue University, West Lafayette, Indiana, USA.

Nature Neuroscience
|September 11, 2012
PubMed
Summary

Sensorineural hearing loss (SNHL) significantly impairs sound temporal coding, especially in noisy environments. This study reveals how SNHL affects auditory processing, explaining hearing difficulties in real-world conditions.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Sensory Biology

Background:

  • Human behavioral studies indicate sensorineural hearing loss (SNHL) impairs temporal processing.
  • Mammalian neurophysiological studies show limited evidence for diminished temporal coding in SNHL.
  • Discrepancies exist between human perception and animal models regarding SNHL's effect on temporal coding.

Purpose of the Study:

  • To investigate the impact of SNHL on peripheral temporal coding in mammals.
  • To reconcile conflicting findings between human behavioral and mammalian neurophysiological studies.
  • To elucidate the mechanisms underlying hearing difficulties in noisy environments for individuals with SNHL.

Main Methods:

  • Utilized a chinchilla model of SNHL.
  • Assessed peripheral neural responses to sound.
  • Compared temporal coding in quiet versus background noise conditions.

Main Results:

  • SNHL significantly degraded peripheral temporal coding in chinchillas.
  • This degradation was substantially more pronounced in the presence of background noise compared to quiet conditions.
  • Findings demonstrate a significant impact of noise on auditory temporal processing in SNHL.

Conclusions:

  • SNHL profoundly affects peripheral temporal coding, particularly in noisy environments.
  • The results help explain why hearing-impaired individuals experience greater difficulties in complex auditory scenes.
  • This study bridges the gap between human perceptual data and mammalian neurophysiological evidence on SNHL and temporal processing.