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Related Experiment Videos

Forward masking in different cochlear implant systems.

Colette Boëx1, Maria-Izabel Kós, Marco Pelizzone

  • 1Centre Romand d'Implants Cochléaires, University Hospital, Geneva, Switzerland. colette.boex@hcuge.ch

The Journal of the Acoustical Society of America
|November 1, 2003
PubMed
Summary

This study compared neural excitation spread from different cochlear implant electrode arrays. Results showed individual differences, with bipolar stimulation offering more restricted spread than monopolar for some devices, impacting speech understanding.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Audiology

Background:

  • Cochlear implant electrode arrays aim to stimulate auditory nerve fibers.
  • The spread of neural excitation influences speech perception outcomes.
  • Electrode positioning systems (EPS) may alter neural activation patterns.

Purpose of the Study:

  • To psychophysically evaluate the neural spread of excitation from various intracochlear electrode arrays.
  • To compare electrode arrays including Ineraid, Clarion S-Series, and Clarion HiFocus-I, with and without the Electrode Positioning System (EPS).
  • To investigate the relationship between neural spread, stimulus configuration, and speech perception.

Main Methods:

  • Forward masking psychophysical experiments were conducted on 12 adult cochlear implant users.

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  • Biphasic stimuli were used to assess neural excitation spread with different electrode arrays and configurations (monopolar vs. bipolar).
  • Masked and unmasked probe signal detection thresholds were measured to quantify forward masking.

    • Main Results:

    • No significant differences in forward masking were observed between electrode arrays in monopolar configuration at speech-coding levels, but inter-subject variability was high.
    • A significant negative correlation was found between forward masking levels and consonant identification performance.
    • Neural spread was more restricted in the bipolar configuration compared to monopolar for Clarion HiFocus-I subjects.

    Conclusions:

    • Individual differences in neural excitation spread are substantial and affect speech perception.
    • Bipolar stimulation configurations can offer more restricted neural activation than monopolar.
    • Optimizing cochlear implant strategies, such as using Compressed Sound Stimulation (CIS) without apical electrodes, may improve consonant identification by managing neural spread.