title: Comparison of Interaural Electrode Pairing Methods for Bilateral Cochlear Implants.
abstract: In patients with bilateral cochlear implants (CIs), pairing matched interaural electrodes and stimulating them with the same frequency band is expected to facilitate binaural functions such as binaural fusion, localization, and spatial release from masking. Because clinical procedures typically do not include patient-specific interaural electrode pairing, it remains the case that each electrode is allocated to a generic frequency range, based simply on the electrode number. Two psychoacoustic techniques for determining interaurally paired electrodes have been demonstrated in several studies: interaural pitch comparison and interaural time difference (ITD) sensitivity. However, these two methods are rarely, if ever, compared directly. A third, more objective method is to assess the amplitude of the binaural interaction component (BIC) derived from electrically evoked auditory brainstem responses for different electrode pairings; a method has been demonstrated to be a potential candidate for bilateral CI users. Here, we tested all three measures in the same eight CI users. We found good correspondence between the electrode pair producing the largest BIC and the electrode pair producing the maximum ITD sensitivity. The correspondence between the pairs producing the largest BIC and the pitch-matched electrode pairs was considerably weaker, supporting the previously proposed hypothesis that whilst place pitch might adapt over time to accommodate mismatched inputs, sensitivity to ITDs does not adapt to the same degree.
authors.affiliation: Medizinische Physik, Universität Oldenburg and Cluster of Excellence "Hearing4all", Germany hongmei.hu@uni-oldenburg.de.
authors.forename: Hongmei
authors.initials: H
authors.lastname: Hu
authors.affiliation: Medizinische Physik, Universität Oldenburg and Cluster of Excellence "Hearing4all", Germany.
authors.forename: Mathias
authors.initials: M
authors.lastname: Dietz
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D000328:Adult; D000368:Aged; D019929:Cochlear Implantation / Q000379:methods; D003054:Cochlear Implants; D003463:Cues; D003638:Deafness / Q000601:surgery*; D004567:Electrodes, Implanted; D004569:Electroencephalography / Q000379:methods; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006801:Humans; D008144:Loudness Perception / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D012494:Sampling Studies; D012680:Sensitivity and Specificity; D013017:Sound Localization / Q000502:physiology
keywords: bilateral cochlear implant; binaural interaction component; electrically evoked auditory brainstem response; interaural electrode pairing; interaural time difference; pitch comparison