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Assessing the Electrode-Neuron Interface with the Electrically Evoked Compound Action Potential, Electrode Position,
Lindsay DeVries1, Rachel Scheperle2, Julie Arenberg Bierer3
1Department of Speech and Hearing Sciences, University of Washington, 4131 15th Ave NE, Seattle, WA, 98105, USA. lindsdev@uw.edu.
Summary
Electrically evoked compound action potentials (ECAPs) can objectively assess cochlear implant channel function. ECAP measures, combined with electrode position, correlate with speech perception, potentially improving outcomes.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Audiology
Background:
- Speech perception in cochlear implant (CI) users varies due to electrode efficacy in stimulating the auditory nerve.
- Understanding the electrode-neuron interface is crucial for optimizing CI performance.
Purpose of the Study:
- To evaluate the electrically evoked compound action potential (ECAP) as a site-specific measure of the electrode-neuron interface.
- To investigate the influence of electrode-to-modiolus distance and neural density on CI channel function and speech perception.
Main Methods:
- Assessed CI channel quality using ECAP, CT-based electrode position, and behavioral thresholds in 10 adult CI users.
- Measured ECAP channel interaction functions (CIF) and peak amplitudes.
- Correlated ECAP measures with electrode-modiolus distance, scalar location, and speech perception scores.
Main Results:
- ECAP CIF width positively correlated with electrode-to-modiolus distance and scalar position.
- ECAP peak amplitude negatively correlated with behavioral thresholds.
- Higher speech perception scores were associated with lower behavioral thresholds and larger ECAP amplitudes.
Conclusions:
- ECAP shows potential as an objective clinical tool for assessing individual CI channels.
- ECAP measurements, considering peripheral factors, may help predict and improve speech perception outcomes in CI users.
