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Related Experiment Videos

Implications of deep electrode insertion on cochlear implant fitting.

Mathieu Gani1, Gregory Valentini, Alain Sigrist

  • 1Centre Romand d'Implants Cochléaires Department of Otolaryngology-Head and Neck Surgery, University Hospital of Geneva, Geneva, Switzerland.

Journal of the Association for Research in Otolaryngology : JARO
|January 12, 2007
PubMed
Summary

Deeply inserted cochlear implant electrodes can improve speech understanding for some users. Deactivating the most apical electrodes enhanced performance in two individuals, suggesting benefits for specific deep insertions.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Modern cochlear implant electrode arrays allow for deeper insertion into the cochlea.
  • The impact of these deep insertions on auditory perception and speech understanding is not well understood.

Purpose of the Study:

  • To evaluate the contribution of deeply inserted electrodes to speech perception.
  • To investigate the effect of deactivating apical electrodes on vowel and consonant identification.
  • To identify electrodes causing pitch confusions in deeply inserted arrays.

Main Methods:

  • Five Med-El cochlear implant users with deep electrode insertions (605-720 degrees) were tested.
  • Vowel and consonant identification tests were performed with varying numbers of apical electrodes deactivated.

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  • Pitch-ranking experiments and radiographic measurements of electrode depth were conducted.

    • Main Results:

    • Two subjects with the deepest insertions showed significantly improved speech identification when apical electrodes were deactivated.
    • The remaining three subjects did not show significant performance improvements with apical electrode deactivation.
    • Four out of five subjects preferred fittings with deactivated apical electrodes; pitch confusions were noted in the deepest insertions.

    Conclusions:

    • Deactivating apical electrodes may benefit cochlear implant users with very deep insertions by reducing neural interactions or improving frequency allocation.
    • Individual variability exists, and not all users benefit from apical electrode deactivation.
    • Further research is needed to optimize electrode configurations for deep cochlear implant insertions.