Document Detail


Masking patterns for monopolar and phantom electrode stimulation in cochlear implants.
MedLine Citation:
PMID:  23299125     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Phantom electrode (PE) stimulation consists of out-of-phase stimulation of two electrodes. When presented at the apex of the electrode array, phantom stimulation is known to produce a lower pitch sensation than monopolar (MP) stimulation on the most apical electrode. The ratio of the current between the primary electrode (PEL) and the compensating electrode (CEL) is represented by the coefficient σ, which ranges from 0 (monopolar) to 1 (full bipolar). The exact mechanism by which PE stimulation produces a lower pitch sensation is unclear. In the present study, unmasked and masked thresholds were obtained using a forward masking paradigm to estimate the spread of current for MP and PE stimulation. Masked thresholds were measured for two phantom electrode configurations (1) PEL = 4, CEL = 5 (lower pitch phantom) and (2) PEL = 4, CEL = 3 (higher pitch phantom). The unmasked thresholds were subtracted from the masked thresholds to obtain masking patterns which were normalized to their peak. The masking patterns reveal (1) differences in the spread of excitation that are consistent with the direction of pitch shift produced by PE stimulation, and (2) narrower spread of electrical excitation for PE stimulation relative to MP stimulation.
Authors:
Aniket A Saoji; David M Landsberger; Monica Padilla; Leonid M Litvak
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2013-01-05
Journal Detail:
Title:  Hearing research     Volume:  298     ISSN:  1878-5891     ISO Abbreviation:  Hear. Res.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-03-11     Completed Date:  2013-08-23     Revised Date:  2013-08-30    
Medline Journal Info:
Nlm Unique ID:  7900445     Medline TA:  Hear Res     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  109-16     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 Elsevier B.V. All rights reserved.
Affiliation:
Research and Technology group, Advanced Bionics, LLC, 28515 Westinghouse Place, Valencia CA 91355, USA. AniketS@advancedbionics.com
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MeSH Terms
Descriptor/Qualifier:
Acoustic Stimulation
Adult
Aged
Aged, 80 and over
Auditory Perception*
Auditory Threshold
Cochlear Implantation / instrumentation*
Cochlear Implants*
Correction of Hearing Impairment / psychology*
Electric Stimulation
Hearing Impaired Persons / psychology,  rehabilitation*
Humans
Middle Aged
Perceptual Masking*
Pitch Perception
Prosthesis Design
Psychoacoustics
Grant Support
ID/Acronym/Agency:
R01 DC012152/DC/NIDCD NIH HHS; R01-DC-001526/DC/NIDCD NIH HHS; R01-DC12152/DC/NIDCD NIH HHS; R03 DC010064/DC/NIDCD NIH HHS; R03-DC-010064/DC/NIDCD NIH HHS
Comments/Corrections

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


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