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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: Sep 14, 2025

Performing Intracochlear Electrocochleography During Cochlear Implantation

Performing Intracochlear Electrocochleography During Cochlear Implantation

Published on: March 8, 2022

Can Electrocochleography Predict Pure Tone Thresholds Without Correction Factors?

Hatice Kübra Bozkurt¹, Ceren Karaçaylı^1,2, Bülent Satar³

¹Department of Audiology, Gülhane Faculty of Health Science, University of Health Science, Ankara, Türkiye.

The Journal of International Advanced Otology

|July 22, 2025

Summary

Electrocochleography (EcochG) accurately estimates hearing thresholds, correlating strongly with pure tone audiometry (PTA). This objective method, using EcochG, can predict PTA results without needing correction factors, benefiting populations where PTA is inconclusive.

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Area of Science:

Audiology
Electrophysiology
Hearing Science

Background:

Electrocochleography (EcochG) offers objective, frequency-specific hearing threshold determination.
Pure tone audiometry (PTA) is standard but can be inconclusive in infants and non-responders.
EcochG provides closer field measurements, presenting a promising alternative for threshold estimation.

Purpose of the Study:

To compare subjective PTA thresholds with objective EcochG-derived thresholds.
To evaluate EcochG's accuracy in patients with diverse hearing loss levels.

Main Methods:

Utilized tone-burst stimuli (0.5, 1, 2, 4 kHz) and click stimuli with extra-tympanic electrodes.
Measured action potential (AP) latency and amplitude.
Compared EcochG AP component with PTA data for threshold estimation.

Main Results:

Demonstrated a strong correlation between frequency-specific PTA thresholds and EcochG thresholds (P < .001).
Found a significant correlation between click stimulus EcochG and the 4-frequency PTA (P < .001).
Linear regression confirmed EcochG's ability to predict PTA thresholds across frequencies.

Conclusions:

EcochG effectively estimates hearing thresholds objectively.
Results suggest EcochG can predict PTA values without requiring correction factors.
EcochG serves as a reliable tool for hearing threshold assessment, particularly when PTA is challenging.