Document Detail

Effects of electrode design and configuration on channel interactions.
MedLine Citation:
PMID:  16338109     Owner:  NLM     Status:  MEDLINE    
A potential shortcoming of existing multichannel cochlear implants is electrical-field summation during simultaneous electrode stimulation. Electrical-field interactions can disrupt the stimulus waveform prior to neural activation. To test whether speech intelligibility can be degraded by electrical-field interaction, speech recognition performance and interaction were examined for three Clarion electrode arrays: the pre-curved, enhanced bipolar electrode array, the enhanced bipolar electrode with an electrode positioner, and the Hi-Focus electrode with a positioner. Channel interaction was measured by comparing stimulus detection thresholds for a probe signal in the presence of a sub-threshold perturbation signal as a function of the separation between the two simultaneously stimulated electrodes. Correct identification of vowels, consonants, and words in sentences was measured with two speech strategies: one which used simultaneous stimulation and another which used sequential stimulation. Speech recognition scores were correlated with measured electrical-field interaction for the strategy which used simultaneous stimulation but not the strategy which used sequential stimulation. Higher speech recognition scores with the simultaneous strategy were generally associated with lower levels of electrical-field interaction. Electrical-field interaction accounted for as much as 70% of the variance in speech recognition scores, suggesting that electrical-field interaction is a significant contributor to the variability found across patients who use simultaneous strategies.
Ginger S Stickney; Philipos C Loizou; Lakshmi N Mishra; Peter F Assmann; Robert V Shannon; Jane M Opie
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2005-12-09
Journal Detail:
Title:  Hearing research     Volume:  211     ISSN:  0378-5955     ISO Abbreviation:  Hear. Res.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-23     Completed Date:  2006-03-27     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  33-45     Citation Subset:  IM    
University of Texas at Dallas, School of Human Development, Box 830688, Richardson, TX 75083-0688, USA.
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MeSH Terms
Cochlear Implants*
Cochlear Nerve / physiology
Electric Stimulation
Equipment Design
Middle Aged
Speech Perception / physiology*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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