| Masker modulation regularity and its effects on comodulation masking release. | |
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MedLine Citation:
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PMID: 20331140 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Several authors have suggested that comodulation masking release is largest when performance in the narrowband masker condition is poor due to perceptual similarities between masker fluctuations and an added signal. The present study tested this hypothesis by manipulating the regularity of masker modulation between but not within listening intervals. The signal was a 500-Hz tone burst, and the masker was a continuous band of noise, either 25- or 1050-Hz wide. After filtering, the masker was amplitude modulated with one of three envelope patterns. The regular envelope was a smoothed 20-Hz square wave, composed of 10-ms raised-cosine ramps and 15-ms steady states. In the irregular envelope conditions, either the duration of the steady state or the modulation depth was randomly selected prior to each modulation period, with one exception: modulation was not randomly perturbed during listening intervals, when the signal might be presented. There were large individual differences, but masker envelope irregularity tended to elevate thresholds, particularly for the 25-Hz masker bandwidth. Results were consistent with more CMR under conditions for which there is greater informational masking in the narrowband masker condition. |
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Authors:
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Emily Buss; Joseph W Hall; John H Grose |
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: 127 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-03-24 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: 2016 Citation Subset: IM |
Affiliation:
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UNC School of Medicine, Chapel Hill, NC 27599, ebuss@med.unc.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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