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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: May 17, 2026

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Published on: October 11, 2024

Cochlear implant combined with a linear frequency transposing hearing aid.

Håkan Hua¹, Björn Johansson, Radi Jönsson

¹Department of Audiology, Sahlgrenska University Hospital, Gothenburg, Sweden.

Journal of the American Academy of Audiology

|October 18, 2012

Summary

For adults with unilateral cochlear implants (CIs), using a hearing aid (HA) on the other ear is beneficial. Linear frequency transposition (LFT) in the HA did not significantly alter speech performance with the CI.

Related Experiment Videos

Last Updated: May 17, 2026

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode

Published on: October 11, 2024

Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Unilateral cochlear implant (CI) use is common, necessitating contralateral hearing aid (HA) use to maintain binaural hearing.
Linear frequency transposition (LFT) is a hearing aid technology that shifts high-frequency sounds to lower frequencies for improved audibility.
The efficacy of LFT in conjunction with a CI is not well-established.

Purpose of the Study:

To investigate the benefits of a hearing aid (HA) with linear frequency transposition (LFT) for adults with a unilateral cochlear implant (CI).
To assess the impact of LFT on speech recognition in quiet and noise, and subjective hearing quality.

Main Methods:

A two-period, single-blind, repeated-measures crossover study involving nine bimodal users (CI + HA).
Speech recognition tests (monosyllabic words, Hearing in Noise Test) and the Speech, Spatial and Qualities of Hearing Questionnaire (SSQ) were administered.
Participants were evaluated under conditions with LFT activated and deactivated in the contralateral HA, with and without the CI.

Main Results:

Bimodal listening conditions (CI + HA) were superior to CI-only listening.
No significant differences in objective or subjective speech performance were found between LFT-on and LFT-off conditions.
Participants performed better with CI-only than with HA-alone.

Conclusions:

Adults with unilateral CIs benefit from contralateral HA use.
Linear frequency transposition (LFT) in a hearing aid does not appear to enhance or degrade speech performance when used with a cochlear implant.