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Comparison of Interaural Electrode Pairing Methods for Bilateral Cochlear Implants.

Hongmei Hu1, Mathias Dietz2

  • 1Medizinische Physik, Universität Oldenburg and Cluster of Excellence "Hearing4all", Germany hongmei.hu@uni-oldenburg.de.

Trends in Hearing
|December 4, 2015
PubMed
Summary
This summary is machine-generated.

Finding the best electrode pairings in bilateral cochlear implants (CIs) is crucial for hearing. This study found that measuring binaural interaction component (BIC) and interaural time difference (ITD) sensitivity effectively identifies optimal electrode pairs for improved binaural hearing.

Keywords:
bilateral cochlear implantbinaural interaction componentelectrically evoked auditory brainstem responseinteraural electrode pairinginteraural time differencepitch comparison

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Bilateral cochlear implants (CIs) aim to improve binaural hearing functions.
  • Current CI fitting practices often use generic electrode-to-frequency mapping, neglecting patient-specific interaural electrode pairing.
  • Optimal electrode pairing is hypothesized to enhance binaural fusion, localization, and spatial release from masking.

Purpose of the Study:

  • To directly compare three methods for determining interaurally paired electrodes in bilateral CI users: interaural pitch comparison, interaural time difference (ITD) sensitivity, and binaural interaction component (BIC) amplitude.
  • To assess the correspondence between these different pairing methods.

Main Methods:

  • Eight bilateral CI users participated in the study.
  • Psychoacoustic testing was used to measure interaural pitch comparison and ITD sensitivity.
  • Electrically evoked auditory brainstem responses (eABRs) were recorded to assess the BIC amplitude for various electrode pairings.

Main Results:

  • A strong correspondence was observed between the electrode pair yielding the largest BIC amplitude and the pair showing maximal ITD sensitivity.
  • The correlation between the electrode pair with the largest BIC and pitch-matched electrode pairs was significantly weaker.
  • These findings suggest that ITD sensitivity is more robust to potential mismatches than place pitch perception.

Conclusions:

  • The BIC amplitude derived from eABRs and ITD sensitivity are reliable indicators for selecting optimal interaural electrode pairings in bilateral CI users.
  • Pitch perception may adapt to accommodate electrode mismatches, while ITD sensitivity appears less adaptable.
  • These results support the development of objective and psychoacoustic methods for patient-specific electrode pairing to optimize binaural hearing with CIs.