| Level-dependent changes in detection of a silent gap in fluctuating noise carriers. | |
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MedLine Citation:
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PMID: 19355451 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Changes in detection of a silent gap in a noise carrier with increasing carrier bandwidth and level may reveal effects of basilar-membrane nonlinearities on envelope fluctuations. Gap-detection thresholds are higher for narrowband than broadband noise carriers due to increased confusion between the imposed gap and inherent fluctuations of the narrowband noise. For narrowband more than broadband carriers, the "effective" magnitude of envelope fluctuations may be reduced by compressive effects of the active cochlear mechanism. To test these assumptions, detection of a gap was measured in 50-Hz-wide and 1000-Hz-wide noise carriers as a function of carrier level. Younger and older adults with normal and impaired hearing listened to carriers presented in quiet and in a low-fluctuation broadband masker. As carrier level increased, masker level also increased, maintaining a fixed difference between carrier and masker levels to minimize sensation-level effects on gap detection. For younger adults, gap detection measured in quiet improved as expected with increasing carrier level. Further, gap detection measured in the masker improved as carrier level increased for the 50-Hz carrier, but declined for the 1000-Hz carrier. Discussion will focus on effects of carrier level, bandwidth, subjects' age and thresholds, and hypothesized relations to basilar-membrane nonlinearities. [Work supported by NIHNIDCD.]. |
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Authors:
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Amy R Horwitz; Jayne B Ahlstrom; Judy R Dubno |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 125 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2009 Apr |
Date Detail:
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Created Date: 2009-04-09 Completed Date: - Revised Date: - |
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: 2723 Citation Subset: IM |
Affiliation:
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Dept. of Otolaryngol.-Head and Neck Surgery, Medical Univ. of South Carolina, 135 Rutledge Ave., MSC 550, Charleston, SC 29425, horwitar@musc.edu. |
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Descriptor/Qualifier:
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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