Abstract:
OBJECTIVES:In newer-generation Cochlear Ltd. cochlear implants, two adjacent electrodes can be electrically coupled to produce a single contact or "dual electrode" (DE). The goal of the present study was to evaluate whether relatively large impedance differences (>3.0 kOhms) between coupled electrodes affect the excitation pattern and pitch percepts produced by the DE. DESIGN:Fifteen electrode pairs in six recipients were tested. Neural spread-of-excitation patterns and pitch perception were measured for adjacent physical electrodes (PEs) and the resulting DE to determine if the lower-impedance PE in the pair dominates the DE response pattern. The results were compared with a "normative sample" (impedance differences <3.0 kOhms) from two earlier studies. RESULTS:In general, spread-of-excitation patterns for DEs more closely approximated those of the lower-impedance PE in each pair. The DE was more easily distinguished in pitch from the higher-impedance PE than the lower-impedance PE. The electrically evoked compound action potential and perceptual results generally differed from those of the normative group. CONCLUSIONS:Impedance differences between adjacent PEs should be considered if DE stimulation is implemented in future research studies or clinical coding strategies.
journal_name
Ear Hearjournal_title
Ear and hearingauthors
Hughes ML,Baudhuin JL,Goehring JLdoi
10.1097/AUD.0000000000000098subject
Has Abstractpub_date
2015-03-01 00:00:00pages
e50-6issue
2eissn
0196-0202issn
1538-4667journal_volume
36pub_type
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