| Spectral integration in bands of modulated or unmodulated noise. | |
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MedLine Citation:
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PMID: 12141347 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Spectral integration was measured for pure-tone signals masked by unmodulated or modulated noise bands centered at the signal frequencies. The bands were typically 100 Hz wide, and when modulated, they were sinusoidally amplitude modulated at a rate of 8 Hz and a depth of 100%. In experiment 1, thresholds were first measured for each individual pure tone of a triplet in the presence of its respective masker band, and then for those three tones added together at their respective threshold levels, masked by their respective masker bands. Four sets of triplets were used: 250, 1000, 4000 Hz; 354, 1000, 2828 Hz; 500, 1000, 2000 Hz; and 800, 1000, 1200 Hz. When the masker bands were unmodulated, the amount of spectral integration was about 2.4 dB for all triplets, consistent with the integration expected based on the multiband energy detector model. When the bands were modulated, the amount of integration depended upon the spacing between masker bands; for the two widest spacings, the integration was between about 0 and 3 dB, whereas for the two closest spacings, the integration was approximately 5 dB. Experiments 2 and 3 addressed the cause of this greater spectral integration in the presence of the modulated masker bands with closer spacing. The second experiment demonstrated that sensitivity (d') was proportional to signal power regardless of whether the background noise was modulated or not, and thus the greater integration in dB in the presence of the modulated noise bands could not be accounted for by shallower psychometric functions in those conditions. Instead, the third experiment showed that the greater integration was likely due to the fact that the masker bands were comodulated. In other words, it was probably due to cues related to comodulation masking release when all three bands (and signals) were present. |
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Authors:
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Sid R Bacon; Nicolas Grimault; Jungmee Lee |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 112 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2002 Jul |
Date Detail:
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Created Date: 2002-07-26 Completed Date: 2002-08-22 Revised Date: 2007-11-14 |
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: 219-26 Citation Subset: IM |
Affiliation:
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Department of Speech and Hearing Science, Arizona State University, Tempe 85287-1908, USA. spb@asu.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Audiometry, Pure-Tone / methods Auditory Threshold / physiology Female Humans Male Noise* Perceptual Masking Psychometrics |
| Grant Support | |
ID/Acronym/Agency:
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DC01376/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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