| Diassociating spectral and temporal influences in an AM-QFM (amplitude modulated and quasi-frequency modulated) discrimination task. | |
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MedLine Citation:
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PMID: 20331022 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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This study investigated temporal and spectral influences in a task used to investigate the bandwidths of phase sensitivity. Subjects discriminated amplitude modulated (AM) tones and quasi-frequency modulated (QFM) tones in a 2IFC. An adaptive threshold procedure was used to estimate modulation depth needed to make the discrimination as a function modulation frequency for a 2000-Hz carrier. Threshold functions were often nonmonotonic, with nonmonotonicities observed at higher-modulation frequencies. This is likely due to the effects of distortion products creating salient spectral cues. When stimulus duration is decreased from 200 to 50, 20, or 10 ms, thresholds for low-modulation frequencies decreased to near-chance levels, whereas thresholds in the region of nonmonotonicities were largely unaffected. The decrease in stimulus duration appears to hinder the listener's ability to use temporal cues in order to discriminate between AM and QFM, whereas spectral information derived from distortion product cues appears to be resilient. [Work supported by NSF BCS-07464003.]. |
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Authors:
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Ewa Borucki; Berg Bruce |
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: 1988 Citation Subset: IM |
Affiliation:
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Dept. of Cognitve Sci., Univ. of California, Irvine, 3151 Social Sci. Plaza, Irvine, CA 92697-5100, eborucki@uci.edu. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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