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The Cochlea

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.

Hair Cells

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.

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Related Experiment Video

Updated: Nov 21, 2025

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Published on: January 9, 2019

Cochlear implants in single-sided deaf recipients: Near normal higher-order processing.

Andre Wedekind¹, Dayse Távora-Vieira¹, An T Nguyen²

¹Otolaryngology, Head and Neck Surgery, Medical School. University of Western Australia, Perth, Australia; Department of Audiology, Fiona Stanley Hospital, Perth, Australia.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology

|January 15, 2021

Summary

This summary is machine-generated.

Cochlear implants improve hearing for single-sided deafness, but the brain shows some processing differences. This research explores how the brain interprets cochlear implant sound signals.

Keywords:

Auditory event related potentials Cochlear implant N2 Oddball task P3b Single-sided deafness

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Last Updated: Nov 21, 2025

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Cochlear Implant Surgery and Electrically-evoked Auditory Brainstem Response Recordings in C57BL/6 Mice

Published on: January 9, 2019

Robotic Cochlear Implantation for Direct Cochlear Access

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Published on: June 16, 2022

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

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Published on: October 11, 2024

Area of Science:

Neuroscience
Auditory Neuroscience
Audiology

Background:

Single-sided deafness (SSD) involves severe hearing loss in one ear.
Cochlear implants (CI) offer functional hearing improvements for SSD.
Brain processing of CI sound signals in SSD remains unclear.

Purpose of the Study:

Investigate higher-order brain processing of sounds from CIs in SSD patients.
Assess functional hearing changes using speech-in-noise and localization tests.
Examine electrophysiological responses (EEG, ERPs) to CI sound input.

Main Methods:

Recorded scalp electroencephalography (EEG) and auditory event-related potentials (ERPs).
Monaurally tested nine experienced single-sided cochlear implant users.
Administered speech-in-noise and localization tests with CI on and off.

Main Results:

CI use improved speech-in-noise and localization abilities.
Similar N2 and P3b ERP effects were seen for both CI and normal hearing ears.
CI condition showed delayed response times and reduced N2 amplitude.

Conclusions:

The brain utilizes normal hearing-like processes for CI sound discrimination.
Processing difficulties in the CI condition may stem from signal degradation.
Cortical responses inform CI candidacy and rehabilitation strategies.