| Masking patterns for monopolar and phantom electrode stimulation in cochlear implants. | |
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MedLine Citation:
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PMID: 23299125 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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Aniket A Saoji; David M Landsberger; Monica Padilla; Leonid M Litvak |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-5 |
Journal Detail:
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Title: Hearing research Volume: - ISSN: 1878-5891 ISO Abbreviation: Hear. Res. Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7900445 Medline TA: Hear Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2013. Published by Elsevier B.V. |
Affiliation:
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Advanced Bionics, LLC, 28515 Westinghouse Place, Valencia, CA 91355 USA. Electronic address: AniketS@advancedbionics.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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