| Brain bases for auditory stimulus-driven figure-ground segregation. | |
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MedLine Citation:
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PMID: 21209201 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Auditory figure-ground segregation, listeners' ability to selectively hear out a sound of interest from a background of competing sounds, is a fundamental aspect of scene analysis. In contrast to the disordered acoustic environment we experience during everyday listening, most studies of auditory segregation have used relatively simple, temporally regular signals. We developed a new figure-ground stimulus that incorporates stochastic variation of the figure and background that captures the rich spectrotemporal complexity of natural acoustic scenes. Figure and background signals overlap in spectrotemporal space, but vary in the statistics of fluctuation, such that the only way to extract the figure is by integrating the patterns over time and frequency. Our behavioral results demonstrate that human listeners are remarkably sensitive to the appearance of such figures. In a functional magnetic resonance imaging experiment, aimed at investigating preattentive, stimulus-driven, auditory segregation mechanisms, naive subjects listened to these stimuli while performing an irrelevant task. Results demonstrate significant activations in the intraparietal sulcus (IPS) and the superior temporal sulcus related to bottom-up, stimulus-driven figure-ground decomposition. We did not observe any significant activation in the primary auditory cortex. Our results support a role for automatic, bottom-up mechanisms in the IPS in mediating stimulus-driven, auditory figure-ground segregation, which is consistent with accumulating evidence implicating the IPS in structuring sensory input and perceptual organization. |
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Authors:
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Sundeep Teki; Maria Chait; Sukhbinder Kumar; Katharina von Kriegstein; Timothy D Griffiths |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of neuroscience : the official journal of the Society for Neuroscience Volume: 31 ISSN: 1529-2401 ISO Abbreviation: J. Neurosci. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-06 Completed Date: 2011-02-04 Revised Date: 2011-08-01 |
Medline Journal Info:
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Nlm Unique ID: 8102140 Medline TA: J Neurosci Country: United States |
Other Details:
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Languages: eng Pagination: 164-71 Citation Subset: IM |
Affiliation:
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Wellcome Trust Centre for Neuroimaging, University College London, London WC1N 3BG, United Kingdom. s.teki@fil.ion.ucl.ac.uk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation
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methods Adult Auditory Pathways / blood supply Auditory Perception / physiology* Brain / blood supply, physiology* Brain Mapping* Female Humans Image Processing, Computer-Assisted Magnetic Resonance Imaging / methods Male Oxygen / blood Psychoacoustics Signal Detection, Psychological / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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061136//Wellcome Trust; WT061136MA//Wellcome Trust |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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