| Forward-masking patterns produced by symmetric and asymmetric pulse shapes in electric hearing. | |
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MedLine Citation:
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PMID: 20058980 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two forward-masking experiments were conducted with six cochlear implant listeners to test whether asymmetric pulse shapes would improve the place-specificity of stimulation compared to symmetric ones. The maskers were either cathodic-first symmetric biphasic, pseudomonophasic (i.e., with a second anodic phase longer and lower in amplitude than the first phase), or "delayed pseudomonophasic" (identical to pseudomonophasic but with an inter-phase gap) stimuli. In experiment 1, forward-masking patterns for monopolar maskers were obtained by keeping each masker fixed on a middle electrode of the array and measuring the masked thresholds of a monopolar signal presented on several other electrodes. The results were very variable, and no difference between pulse shapes was found. In experiment 2, six maskers were used in a wide bipolar (bipolar+9) configuration: the same three pulse shapes as in experiment 1, either cathodic-first relative to the most apical or relative to the most basal electrode of the bipolar channel. The pseudomonophasic masker showed a stronger excitation proximal to the electrode of the bipolar pair for which the short, high-amplitude phase was anodic. However, no difference was obtained with the symmetric and, more surprisingly, with the delayed pseudomonophasic maskers. Implications for cochlear implant design are discussed. |
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Authors:
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Olivier Macherey; Astrid van Wieringen; Robert P Carlyon; Ingeborg Dhooge; Jan Wouters |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Jan |
Date Detail:
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Created Date: 2010-01-11 Completed Date: 2010-03-01 Revised Date: 2010-12-17 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 326-38 Citation Subset: IM |
Affiliation:
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ExpORL, Department of Neurosciences, KU Leuven, Herestraat 49, Bus 721, 3000 Leuven, Belgium. olivier.macherey@mrc-cbu.cam.ac.uk |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Acoustics* Adult Aged Analysis of Variance Auditory Perception* Auditory Threshold Cochlear Implants* Deafness / physiopathology, therapy Humans Middle Aged Neurons / physiology Perceptual Masking* Psychoacoustics Signal Processing, Computer-Assisted Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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080216//Wellcome Trust |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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