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Effect of stimulation parameters on sequential current-steered stimuli in cochlear implants.

Johanie Roux¹, Johan J Hanekom¹

¹Bioengineering, Department of Electrical, Electronic, and Computer Engineering, University of Pretoria, University Road, Pretoria 0002, South Africa.

The Journal of the Acoustical Society of America

|August 5, 2022

Summary

Cochlear implant (CI) users can experience pitch changes by stimulating two electrodes sequentially. Individualized settings are key for effective current steering and manipulating pitch perception in hearing devices.

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Area of Science:

Audiology
Neuroscience
Biomedical Engineering

Background:

Cochlear implants (CI) aim to restore hearing by electrically stimulating the auditory nerve.
Place pitch, a crucial element of CI sound perception, is determined by which nerve fibers are activated.
Current steering is a technique to modulate neural activation patterns for improved pitch perception.

Purpose of the Study:

To investigate if sequential stimulation of two CI electrodes can shift activated neural populations.
To determine the effectiveness of different stimulation parameters in current steering for pitch manipulation.
To explore the potential of current steering in sequential stimulation CIs.

Main Methods:

Sequential electrical stimulation of two CI electrodes in nine CI users (ten ears).
Varied stimulation parameters: pulse rate, pulse width, and inter-electrode distance.
Assessed pitch perception changes in response to current steering.

Main Results:

Pitch perception shifts varied among participants, indicating a need for individualized parameter selection.
Pulse width had minimal impact on current steering effectiveness.
Wider electrode spacing and matching stimulation pulse rate to the clinical MAP often yielded more significant pitch shifts.

Conclusions:

Sequential current steering shows potential for place pitch manipulation in CIs.
Individualized selection of stimulation parameters is crucial for successful current steering.
This technique may enhance pitch perception in CIs limited to sequential stimulation.