| Visualizing dynamical neural assemblies with a fuzzy synchronization clustering analysis. | |
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MedLine Citation:
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PMID: 19904503 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Phase synchrony has been proposed as a possible communication mechanism between cerebral regions. The participation index method (PIM) may be used to investigate integrating structures within an oscillatory network, based on the eigenvalue decomposition of matrix of bivariate synchronization indices. However, eigenvector orthogonality between clusters may result in categorization difficulties for hub oscillators and pseudoclustering phenomenon. Here, we propose a method of fuzzy synchronization clustering analysis (FSCA) to avoid the constraint of orthogonality by combining the fuzzy c-means algorithm with the phase-locking value. Following mathematical derivation, we cross-validated the FSCA and the PIM using the same multichannel phase time series of event-related EEG from a subject performing a working memory task. Both clustering methods produced consistent findings for the qualitatively salient configuration of the original network-illustrated here by a visualization technique. In contrast to PIM, use of common virtual oscillatory centroids enabled the FSCA to reveal multiple dynamical neural assemblies as well as the unitary phase information within each assembly. |
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Authors:
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Shu Zhou; Yan Wu; Claudia C Dos Santos |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Validation Studies |
Journal Detail:
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Title: Neuroinformatics Volume: 7 ISSN: 1559-0089 ISO Abbreviation: Neuroinformatics Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2010-01-21 Completed Date: 2010-03-11 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101142069 Medline TA: Neuroinformatics Country: United States |
Other Details:
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Languages: eng Pagination: 233-44 Citation Subset: IM |
Affiliation:
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Department of Neurology, Nanfang Hospital, Southern Medical University, #1838 Northern Guangzhou Avenue, Guangzhou, 510515 Guangdong, China. zhoushu@hotmail.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Algorithms Brain / physiology* Cluster Analysis* Cortical Synchronization / methods* Female Fuzzy Logic* Humans Memory, Short-Term / physiology Neurons / physiology* Neuropsychological Tests Periodicity* Theta Rhythm |
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