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Rhythmic masking release: contribution of cues for perceptual organization to the cross-spectral fusion of concurrent narrow-band noises.

Turgeon, M. and Ahad, P. A. and Bregman, A. S. (2002) Rhythmic masking release: contribution of cues for perceptual organization to the cross-spectral fusion of concurrent narrow-band noises. Journal of the Acoustical Society of America, 111. pp. 1819-1831. ISSN 0001-4966

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Abstract

The contribution of temporal asynchrony, spatial separation, and frequency separation to the cross-spectral fusion of temporally contiguous brief narrow-band noise bursts was studied using the Rhythmic Masking Release paradigm (RMR). RMR involves the discrimination of one of two possible rhythms, despite perceptual masking of the rhythm by an irregular sequence of sounds identical to the rhythmic bursts, interleaved among them. The release of the rhythm from masking can be induced by causing the fusion of the irregular interfering sounds with concurrent "flanking" sounds situated in different frequency regions. The accuracy and the rated clarity of the identified rhythm in a 2-AFC procedure were employed to estimate the degree of fusion of the interferring sounds with flanking sounds. The results suggest that while synchrony fully fuses short-duration noise bursts across frequency and across space (i.e., across ears and loudspeakers), an asynchrony of 20–40 ms produces no fusion. Intermediate asynchronies of 10–20 ms produce partial fusion, where the presence of other cues is critical for unambiguous grouping. Though frequency and spatial separation reduced fusion, neither of these manipulations was sufficient to abolish it. For the parameters varied in this study, stimulus onset asynchrony was the dominant cue determining fusion, but there were additive effects of the other cues. Temporal synchrony appears to be critical in determining whether brief sounds with abrupt onsets and offsets are heard as one event or more than one. ©2002 Acoustical Society of America.

Item Type: Article
Journal or Publication Title: Journal of the Acoustical Society of America
Additional Information: Turgeon was first and lead author. She originated the questions and design, collected and analysed the data, and wrote the manuscript. RAE_import_type : Journal article RAE_uoa_type : Psychology
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 3645
Deposited By: ep_importer
Deposited On: 07 Mar 2008 14:28
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:56
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/3645

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