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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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Full-array channel discrimination in cochlear implants: validation and clinical application.

Coen A A Windmeijer¹, Jan Dirk Biesheuvel¹, Peter-Paul B M Boermans¹

¹ENT Department, Leiden University Medical Centre, Leiden, The Netherlands.

International Journal of Audiology

|July 25, 2022

Summary

This study validates a new tool for cochlear implant (CI) users to estimate channel discrimination, finding it correlates with speech perception. The full-array pitch discrimination test shows promise as a clinical tool.

Keywords:

Cochlear implant electrode array place-pitch discrimination psychophysics speech perception

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Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Cochlear implants (CI) aim to restore hearing by stimulating the auditory nerve.
Accurate pitch perception is crucial for speech understanding in CI users.
Estimating channel discrimination across the entire CI electrode array is important for optimizing device fitting.

Purpose of the Study:

To validate a novel tool for estimating channel discrimination along the full CI electrode array.
To investigate the relationship between place-pitch discrimination and speech perception in CI users.

Main Methods:

Two tests were employed: psychometric functions (PFs) to determine just noticeable difference (JNDα) and a full-array test for discrimination score (Dα).
Stimuli were created using dual electrode stimulation with current steering (α).
Speech perception was measured using consonant-vowel-consonant phoneme recognition.

Main Results:

JNDα and Dα scores showed a significant positive correlation (r_s = 0.64, p < 0.001).
Mean JNDα scores were significantly related to speech perception abilities in both quiet and noisy conditions.
The full-array test (Dα) correlated strongly with JNDα scores from PFs.

Conclusions:

The proposed full-array pitch discrimination test is a valid tool for CI users.
This test may underestimate discrimination for poorer performers.
The full-array pitch discrimination test can be a valuable clinical tool for identifying areas needing improved pitch discrimination fitting.