Implications of deep electrode insertion on cochlear implant fitting.

Implications of deep electrode insertion on cochlear implant fitting. Research Abstract Details 

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Implications of deep electrode insertion on cochlear implant fitting. Abstract Text:

Using long Med-El Combi40+ electrode arrays, it is now possible to cover the whole range of the cochlea, up to about two turns. Such insertion depths have received little attention. To evaluate the contribution of deeply inserted electrodes, five Med-El cochlear implant users were tested on vowel and consonant identification tests with fittings with first one, two, and up to five apical electrodes being deactivated. In addition, subjects performed pitch-ranking experiments, using loudness-balanced stimuli, to identify electrodes creating pitch confusions. Radiographs were taken to measure each electrode insertion depth. All subjects used each modified fitting for two periods of about 3 weeks. During the experiment, the same stimulation rate and frequency range were maintained across all the fittings used for each individual subject. After each trial period the subject had to perform three consonant and three vowel identification tests. All subjects showed deep electrode insertions ranging from 605 degrees to 720 degrees. The two subjects with the deepest electrode insertions showed significantly increased vowel- and consonant-identification performances with fittings with the two or three most apical electrodes deactivated compared to their standard fitting with all available electrodes activated. The other three subjects did not show significant improvements in performance when one or two of their most apical electrodes were deactivated. Four out of five subjects preferred to continue use of a fitting with one or more apical electrodes deactivated. The two subjects with the deepest insertions also showed pitch confusions between their most apical electrodes. Two possible reasons for these results are discussed. One is to reduce neural interactions related to electrodes producing pitch confusions. Another is to improve the alignment of the frequency components of sounds coded by the electrical signals delivered to each electrode to the overall pitch of the auditory perception produced by the electrical stimulation of auditory nerve fibers.

Implications of deep electrode insertion on cochlear implant fitting. Publishing Authors By Initials

For similar psychological phenomena and processes: mental processes: perception: auditory perception: speech perception research abstracts see: psychological phenomena and processes: mental processes: perception: auditory perception: speech perception research

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Implications of deep electrode insertion on cochlear implant fitting. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of the Association for Research in Otolary

VOLUME: 8

Page Numbers: 69-83

Journal Abbreviation: J. Assoc. Res. Otolaryngol.

ISSN: 1525-3961

DAY: 11

MONTH: 01

YEAR: 2007

Implications of deep electrode insertion on cochlear implant fitting. Information

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LANGUAGE: eng

NlmUniqueID: 100892857

Implications of deep electrode insertion on cochlear implant fitting. Keywords Mesh Terms:

KEYWORDS: Speech Perception

MESH TERMS: surgery

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Grant and Affiliation Information for Implications of deep electrode insertion on cochlear implant fitting.

AFFILIATION: Centre Romand d'Implants Cochléaires Department of Otolaryngology-Head and Neck Surgery, University Hospital of Geneva, Geneva, Switzerland.

Country: United States

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MEDLINETA: J Assoc Res Otolaryngol

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