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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.

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Related Experiment Video

Updated: Apr 28, 2026

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery

Published on: August 4, 2023

Single- and multi-channel modulation detection in cochlear implant users.

John J Galvin¹, Sandy Oba², Qian-Jie Fu²

¹Division of Communication and Auditory Neuroscience, House Research Institute, Los Angeles, California, United States of America; Department of Head and Neck Surgery, David Geffen School of Medicine, University of California Los Angeles, Los Angeles, California, United States of America; Department of Otorhinolaryngology, Head and Neck Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands; Research School of Behavioral and Cognitive Neurosciences, Graduate School of Medical Sciences, University of Groningen, Groningen, The Netherlands.

|June 12, 2014

Summary

This summary is machine-generated.

Single-channel measures may overestimate cochlear implant (CI) users' multichannel modulation sensitivity. CI users integrate information across channels rather than relying on the best single channel for improved performance.

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

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Published on: March 24, 2023

Area of Science:

Auditory Neuroscience
Signal Processing in Hearing
Cochlear Implant Technology

Background:

Single-channel modulation detection thresholds (MDTs) correlate with cochlear implant (CI) speech performance.
Multichannel modulation sensitivity in CI users is not well understood.
Potential factors influencing multichannel sensitivity include loudness summation and variations in single-channel MDTs.

Purpose of the Study:

To investigate multichannel modulation sensitivity in CI users.
To determine the influence of loudness summation and across-site variance on multichannel MDTs.
To compare single-channel and multichannel MDTs under different loudness conditions.

Main Methods:

Measured single- and multichannel MDTs in 9 CI users.
Tested at low and high presentation levels and modulation frequencies.
Acquired multichannel MDTs with and without loudness compensation.

Main Results:

Presentation level and modulation frequency effects were similar for single- and multichannel MDTs.
Multichannel MDTs were worse than single-channel MDTs at equal loudness, suggesting overestimation by single-channel measures.
Multichannel MDTs were better than the best single-channel MDT when loudness was not compensated.

Conclusions:

Single-channel MDTs may overestimate CI users' multichannel modulation sensitivity at equal loudness.
CI users appear to integrate envelope information across channels, not just attend to the best channel.
Across-site variance in single-channel MDTs did not correlate with the multichannel advantage.