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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Electrode spanning with partial tripolar stimulation mode in cochlear implants.

Ching-Chih Wu1, Xin Luo

  • 1School of Electrical and Computer Engineering, Purdue University, 500 Oval Drive, West Lafayette, IN, 47907, USA, wu94@purdue.edu.

Journal of the Association for Research in Otolaryngology : JARO
|May 29, 2014
PubMed
Summary
This summary is machine-generated.

Electrode spanning in cochlear implants (CI) can create new pitch channels by adjusting current return paths. This technique helps manage defective electrodes and improve CI sound perception.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Cochlear implants (CI) use electrical stimulation to restore hearing.
  • Partial tripolar (pTP) stimulation is a common CI strategy.
  • Electrode spanning offers a method to modify CI stimulation patterns.

Purpose of the Study:

  • To investigate the perceptual effects of electrode spanning in pTP mode.
  • To determine if electrode spanning can create additional spectral channels in CIs.
  • To evaluate electrode spanning as a solution for defective CI electrodes.

Main Methods:

  • Tested electrode spanning on a main electrode (EL8) in five CI users.
  • Varied current focusing (σ) and current steering (α) parameters.
  • Compared pitches elicited by standard pTP stimuli with spanned pTP stimuli.

Main Results:

  • Apical spanning elicited higher pitches, basal spanning lower pitches than standard pTP.
  • Pitch perception varied with the degree of current steering (α) and focusing (σ).
  • Specific α values (0.69 apical, 0.38 basal) and σ adjustments can match standard pTP pitch.

Conclusions:

  • Electrode spanning is an effective field-shaping technique for CIs.
  • This method can add spectral channels, enhancing CI performance.
  • Electrode spanning provides a viable strategy for managing defective CI electrodes.