Effect of electrode impedance on spread of excitation and pitch perception using electrically coupled "dual-electrode" stimulation.

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 Hear

journal_title

Ear and hearing

authors

Hughes ML,Baudhuin JL,Goehring JL

doi

10.1097/AUD.0000000000000098

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

e50-6

issue

2

eissn

0196-0202

issn

1538-4667

journal_volume

36

pub_type

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