| Frequency resolution for diotic and dichotic listening conditions compared using the bandlimiting measure and a modified bandlimiting measure. | |
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MedLine Citation:
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PMID: 2030220 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Two experiments were performed that examined the relation between frequency selectivity for diotic and dichotic stimuli. Subjects were eight normal-hearing listeners. In each experiment, a 500-Hz pure tone of 400-ms duration was presented in continuous noise. In the diotic listening conditions, a signal and noise were presented binaurally with no interaural differences (So and No, respectively). In the dichotic listening conditions, the signal or noise at one ear was 180 degrees out-of-phase relative to the respective stimulus at the other ear (S pi and N pi, respectively). The first experiment examined frequency selectivity using the bandlimiting measure. Here, signal thresholds were determined as a function of masker bandwidth (50, 100, 250, 500, and 1000 Hz) for SoNo, S pi No, and SoN pi listening conditions. The second experiment used a modified bandlimiting measure. Here, signal thresholds (So and S pi) were determined with a relatively narrow No band of masker energy (50 Hz wide) centered about the signal. Then, a second No narrow-band masker (30 Hz wide) was added at another frequency region, and signal thresholds were reestablished. The results of the two experiments indicated that listeners process a wider band of frequencies when resolving dichotic stimuli than when resolving diotic or monotic stimuli. The results also indicated that the bandlimiting measure may underestimate the spectral band processed upon dichotic stimulation. Results are interpreted in terms of an across-ear and across-frequency processing of waveform amplitude envelope. |
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Authors:
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J A Cokely; J W Hall |
Publication Detail:
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Type: Comparative Study; 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: 89 ISSN: 0001-4966 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 1991 Mar |
Date Detail:
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Created Date: 1991-06-20 Completed Date: 1991-06-20 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: 1331-9 Citation Subset: IM |
Affiliation:
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Northwestern University, Department of Communication Sciences and Disorders, Chicago, Illinois 60611. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation
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methods* Acoustics Adolescent Adult Auditory Threshold / physiology* Dichotic Listening Tests* Female Humans Male Noise Perceptual Masking* Pitch Discrimination* |
| Grant Support | |
ID/Acronym/Agency:
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R01 C00418//PHS HHS; R01 DC00397/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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