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Exploring the Use of Interleaved Stimuli to Measure Cochlear-Implant Excitation Patterns.

François Guérit1, John C Middlebrooks2,3,4, Robin Gransier5,6

  • 1Cambridge Hearing Group, MRC Cognition & Brain Sciences Unit, University of Cambridge, Cambridge, England. francois.guerit@mrc-cbu.cam.ac.uk.

Journal of the Association for Research in Otolaryngology : JARO
|March 8, 2024
PubMed
Summary

Current-focusing strategies in cochlear implants (CI) did not reduce neural spread. A new masking method revealed one configuration broadened excitation patterns, but failed to show sharpening with focused stimulation.

Keywords:
Cochlear implantsExcitation patternsInterleaved maskingMonopolarTripolar

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Area of Science:

  • Auditory neuroscience
  • Biomedical engineering
  • Cochlear implant technology

Background:

  • Current-focusing strategies in cochlear implants (CI) aim to reduce neural spread of excitation.
  • Human studies show mixed success, unlike promising animal study results, possibly due to methodological sensitivity or species differences.

Purpose of the Study:

  • To investigate the effectiveness of different stimulation configurations in modulating neural excitation patterns in human cochlear implant users.
  • To assess if current-focusing strategies can indeed sharpen excitation patterns, addressing discrepancies between human and animal study findings.

Main Methods:

  • An interleaved-masking method was employed to measure psychophysical excitation patterns in seven CI participants.
  • Four masker stimulation configurations were tested: monopolar (MP), partial tripolar (pTP), a wider partial tripolar (pTP+2), and a reverse polarity (RP+2) condition designed for broader excitation.

Main Results:

  • A significant effect of stimulation configuration on masking patterns was observed.
  • The RP+2 configuration produced a statistically broader excitation pattern compared to MP and pTP configurations.
  • Monopolar and current-focusing configurations (pTP, pTP+2) did not significantly differ in their excitation pattern width.

Conclusions:

  • The interleaved-masking method is sensitive enough to detect excitation pattern broadening but did not provide evidence for sharpening with focused stimulation in humans.
  • Voltage recordings accurately predicted broadening with RP+2 but inaccurately predicted sharpening with pTP+2.
  • The study suggests the interleaved-masking method is applicable to non-human species and objective measures for CI excitation patterns.