Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration.

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Abstract Text:

Julie Arenberg Bierer,

The efficacy of cochlear implants is limited by spatial and temporal interactions among channels. This study explores the spatially restricted tripolar electrode configuration and compares it to bipolar and monopolar stimulation. Measures of threshold and channel interaction were obtained from nine subjects implanted with the Clarion HiFocus-I electrode array. Stimuli were biphasic pulses delivered at 1020 pulses/s. Threshold increased from monopolar to bipolar to tripolar stimulation and was most variable across channels with the tripolar configuration. Channel interaction, quantified by the shift in threshold between single- and two-channel stimulation, occurred for all three configurations but was largest for the monopolar and simultaneous conditions. The threshold shifts with simultaneous tripolar stimulation were slightly smaller than with bipolar and were not as strongly affected by the timing of the two channel stimulation as was monopolar. The subjects' performances on clinical speech tests were correlated with channel-to-channel variability in tripolar threshold, such that greater variability was related to poorer performance. The data suggest that tripolar channels with high thresholds may reveal cochlear regions of low neuron survival or poor electrode placement.

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Publishing Authors By Initials

JA Bierer,

For similar nervous system: neurons research abstracts see: nervous system: neurons research

PUBMED ID PMID:

MEDLINE DATE:

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Journal Published:

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

Journal: The Journal of the Acoustical Society of America

VOLUME: 121

Page Numbers: 1642-53

Journal Abbreviation:

ISSN: 0001-4966

DAY: 3

MONTH: Mar

YEAR: 2007

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 7503051

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Keywords Mesh Terms:

KEYWORDS: Neurons

MESH TERMS: pathology

Chemical & Substance for Abstract: Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration.

AFFILIATION: Department of Speech and Hearing Sciences, University of Washington, 1417 NE 42nd Street, Box 354875, Seattle, Washington 98105-6246, USA. jbierer@u.washington.edu

Country: United States

AGENCY: United States NIDCD

GRANT: F32 DC05883

ACRONYM: DC

MEDLINETA: J Acoust Soc Am

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration Related Publications

• Effects of parental PTSD on the cortisol response to dexamethasone administration in their adult offspring.
• Gelsolin overexpression alters actin dynamics and tyrosine phosphorylation of lipid raft-associated proteins in Jurkat T cells.
• Induced Escherichia coli infection in baby chicks.
• Parental posttraumatic stress disorder as a vulnerability factor for low cortisol trait in offspring of holocaust survivors.
• Successful implementation of an alcohol-withdrawal pathway in a general hospital.
• Theory and practice of psychiatric day hospitals.
• Threshold and channel interaction in cochlear implant users: evaluation of the tripolar electrode configuration.
• Transgenerational transmission of cortisol and PTSD risk.
• Water-soluble furaltadone reduces poult "starve-out" mortality.