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Perceptual changes with monopolar and phantom electrode stimulation.

Silke Klawitter1, David M Landsberger2, Andreas Büchner3

  • 1Medical University Hannover, Hannover, Germany.

Hearing Research
|January 13, 2018
PubMed
Summary
This summary is machine-generated.

Phantom electrode (PE) stimulation lowers pitch perception in cochlear implant (CI) users. This study found PE stimulation offers a way to expand the pitch range without significant side effects, potentially improving sound coding strategies.

Keywords:
Cochlear implantMultidimensional scalingPhantomSound coding strategy

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Audiology

Background:

  • Phantom electrode (PE) stimulation involves out-of-phase stimulation from adjacent intra-cochlear electrodes.
  • PE stimulation can potentially stimulate more apical cochlear regions, extending the pitch range for cochlear implant (CI) users.
  • Perceptual differences beyond pitch shift and electrode location dependency of PE stimulation are not well understood.

Purpose of the Study:

  • To investigate perceptual differences between monopolar (MP) and PE stimulation.
  • To evaluate pitch and sound quality variations across multiple electrode positions.
  • To determine if PE stimulation's effects vary with electrode location.

Main Methods:

  • 10 Advanced Bionics CI users participated.
  • Multidimensional scaling (MDS) and traditional scaling procedures were used.
  • Participants rated perceptual distances between MP and PE stimuli and described isolated stimulus qualities (pitch, clarity).

Main Results:

  • Perceptual differences between MP and PE stimulation were explained by a single dimension, identified as place pitch.
  • PE stimulation consistently elicited lower pitch perceptions across all tested cochlear regions.
  • Cone Beam Computer Tomography (CBCT) data suggested PE stimulation might be more effective in the apical cochlea.

Conclusions:

  • PE stimulation reliably lowers pitch perception, offering a method to expand the pitch range for CI users.
  • PE stimulation can be integrated into new sound coding strategies without significant perceptual side effects.
  • The findings support PE stimulation as a valuable tool for enhancing CI sound quality and pitch perception.