| Encoding pitch contours using current steering. | |
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MedLine Citation:
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PMID: 20815457 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study investigated cochlear implant (CI) users' ability to perceive pitch cues from time-varying virtual channels (VCs) to identify pitch contours. Seven CI users were tested on apical, medial, and basal electrode pairs with stimulus durations from 100 to 1000 ms. In one stimulus set, 9 pitch contours were created by steering current between the component electrodes and the VC halfway between the electrodes. Another stimulus set only contained 3 pitch contours (flat, falling, and rising). VC discrimination was also tested on the same electrodes. The total current level of dual-electrode stimuli was linearly interpolated between those of single-electrode stimuli to minimize loudness changes. The results showed that pitch contour identification (PCI) scores were similar across electrode locations, and significantly improved at longer durations. For durations longer than 300 ms, 2 subjects had nearly perfect 9-contour identification, and 5 subjects perfectly identified the 3 basic contours. Both PCI and VC discrimination varied greatly across subjects. Cumulative d(') values for VC discrimination were significantly correlated with 100-, 200-, and 500-ms PCI scores. These results verify the feasibility of encoding pitch contours using current steering, and suggest that identification of such pitch contours strongly relies on CI users' sensitivity to VCs. |
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Authors:
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Xin Luo; David M Landsberger; Monica Padilla; Arthi G Srinivasan |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 128 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-09-06 Completed Date: 2011-01-12 Revised Date: 2011-09-13 |
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: 1215-23 Citation Subset: IM |
Affiliation:
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Department of Speech, Language, and Hearing Sciences, Purdue University, 500 Oval Drive, West Lafayette, Indiana 47907, USA. luo5@purdue.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Adult Aged Auditory Threshold Cochlear Implants* Cues Feasibility Studies Female Hearing Impaired Persons / psychology, rehabilitation* Humans Loudness Perception Male Middle Aged Pitch Perception* Rehabilitation of Hearing Impaired / psychology* Signal Detection, Psychological Signal Processing, Computer-Assisted Speech Perception* Time Factors |
| Grant Support | |
ID/Acronym/Agency:
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R01-DC-001526/DC/NIDCD NIH HHS; R03-DC-008192/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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