| The fusion of unattended duration representations as indexed by the mismatch negativity (MMN). | |
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MedLine Citation:
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PMID: 22197031 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Within a single train of same-duration (standard) stimuli, an occasional longer-duration (deviant) sound elicits mismatch negativity (MMN) with a peak latency (measured relative to sound onset) reflecting the standard duration representation. When two such trains are presented in a dichotic paradigm, a separate duration representation arises for each train. We examined the role of attention in this segregation. Four sound trains of differing frequencies (1000 and 1200Hz to one ear, 2000 and 2400Hz to the other ear) were presented simultaneously. Participants attended the lower frequency (Low) sounds (always 100ms) in one ear. Duration of the other (High) sounds varied: 100ms in the Equal condition; 40ms in the Short condition. If attention was necessary for separation of sound representations, the two attended ear representations were hypothesised to segregate whilst the two unattended ear's representations would remain fused. Duration MMN was recorded to occasional (1 in 18) 150ms deviants in all trains. In the Short condition, if unattended ear representations fused, earlier peaking unattended Low sound MMN was expected, relative to when this ear was attended. In the same condition, the MMN for unattended High sounds was expected to peak later, relative to when attended. Low sound unattended MMN latency was indeed earlier by ~30ms relative to when attended. High sound unattended MMN latency, however, only increased ~9ms in the same transition. This smaller magnitude change is explained by a minimum MMN onset latency. Attention alone appears to offer a basis for segregating MMN representations. |
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Authors:
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Kane A Pfingst; David N McKenzie |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-31 |
Journal Detail:
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Title: Brain research Volume: - ISSN: 1872-6240 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-12-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0045503 Medline TA: Brain Res Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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