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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: Jun 10, 2025

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

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

Published on: March 24, 2023

A Variable-Stimulus Distortion Product Otoacoustic Emission Screening Method to Match Cochlear Place-Specific

Samantha Stiepan¹, Sumitrajit Dhar^1,2

¹Department of Communication Sciences and Disorders, Roxelyn and Richard Pepper, Northwestern University, Evanston, Illinois, USA.

Ear and Hearing

|October 16, 2024

Summary

New distortion product otoacoustic emissions (DPOAEs) screening methods using frequency-dependent stimuli improve hearing loss detection. This approach enhances signal quality and accuracy, especially at higher frequencies, for better cochlear function assessment.

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Optogenetic Stimulation of the Auditory Nerve

Optogenetic Stimulation of the Auditory Nerve

Published on: October 8, 2014

Area of Science:

Auditory Neuroscience
Otoacoustic Emissions
Hearing Diagnostics

Background:

Distortion product otoacoustic emissions (DPOAEs) are widely used for hearing loss screening, particularly in newborns.
Current DPOAE screening protocols utilize stimulus conditions that do not account for the cochlea's local mechanical properties and are limited in frequency range.
Recent advancements have identified optimized stimulus frequency ratios and levels for DPOAE recording up to 19 kHz, improving signal-to-noise ratios and DPOAE levels in normally functioning cochleae.

Purpose of the Study:

To evaluate the clinical performance of physiologically motivated, locally appropriate stimulus parameters for DPOAE screening.
To assess the efficacy of these optimized parameters in identifying hearing loss.

Main Methods:

The study included 24 adults with sensorineural hearing loss and 31 with normal hearing.
Cubic DPOAEs were measured up to 16 kHz under various stimulus conditions.
Receiver operating characteristic (ROC) curves were employed to determine the most sensitive stimulus combinations for hearing loss screening.

Main Results:

ROC curve analysis confirmed improved test efficacy for hearing loss detection.
The enhanced efficacy was achieved using stimulus frequency ratios and levels that are frequency-dependent and align with known cochlear mechanical properties.

Conclusions:

A novel DPOAE recording paradigm, termed variable-stimuli DP, is proposed.
This new method utilizes stimuli tailored to local cochlear properties.
The variable-stimuli DP approach holds potential for earlier and more accurate detection of declining cochlear function.