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Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation
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Masking patterns for monopolar and phantom electrode stimulation in cochlear implants.

Aniket A Saoji1, David M Landsberger, Monica Padilla

  • 1Research and Technology group, Advanced Bionics, LLC, 28515 Westinghouse Place, Valencia CA 91355, USA. AniketS@advancedbionics.com

Hearing Research
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

Phantom electrode (PE) stimulation, compared to monopolar (MP) stimulation, alters pitch perception. This study found PE stimulation results in a narrower spread of electrical excitation, explaining the pitch differences observed in cochlear implant users.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Auditory Perception

Background:

  • Phantom electrode (PE) stimulation uses out-of-phase signals on two electrodes.
  • PE stimulation at the cochlear implant apex creates a lower pitch than monopolar (MP) stimulation.
  • The precise mechanism behind PE's pitch alteration remains unclear.

Purpose of the Study:

  • To investigate the spread of current for MP and PE stimulation.
  • To understand how current spread relates to pitch perception differences.
  • To elucidate the neural mechanisms underlying PE stimulation effects.

Main Methods:

  • Utilized a forward masking paradigm to measure unmasked and masked auditory thresholds.
  • Obtained thresholds for two PE configurations: PEL=4, CEL=5 (lower pitch) and PEL=4, CEL=3 (higher pitch).
  • Calculated masking patterns by subtracting unmasked from masked thresholds and normalized them.

Main Results:

  • Masking patterns revealed differences in the spread of excitation between PE and MP stimulation.
  • These differences in excitation spread correlated with the observed pitch shifts.
  • PE stimulation demonstrated a narrower spread of electrical excitation compared to MP stimulation.

Conclusions:

  • The study provides evidence that altered current spread underlies the pitch modulation by PE stimulation.
  • Phantom electrode stimulation offers a narrower excitation pattern than monopolar stimulation.
  • Findings contribute to understanding pitch perception in cochlear implant technology.