Assessment of Multivariate Neural Time Series by Phase Synchrony Clustering in a Time-Frequency-Topography Representation

Autor: Raquel Valdés-Cristerna, Oscar Yanez-Suarez, M. A. Porta-Garcia
Rok vydání: 2018
Předmět:
Multivariate statistics
Article Subject
General Computer Science
Computer science
General Mathematics
Bivariate analysis
Electroencephalography
lcsh:Computer applications to medicine. Medical informatics
050105 experimental psychology
Synchronization
lcsh:RC321-571
03 medical and health sciences
0302 clinical medicine
medicine
Cluster Analysis
Humans
0501 psychology and cognitive sciences
Cortical Synchronization
Cluster analysis
lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry
medicine.diagnostic_test
business.industry
General Neuroscience
05 social sciences
Brain
Contrast (statistics)
Signal Processing
Computer-Assisted
Pattern recognition
General Medicine
Levenshtein distance
Time–frequency analysis
Multivariate Analysis
lcsh:R858-859.7
Artificial intelligence
Artifacts
business
Algorithms
030217 neurology & neurosurgery
Research Article
Zdroj: Computational Intelligence and Neuroscience
Computational Intelligence and Neuroscience, Vol 2018 (2018)
ISSN: 1687-5273
1687-5265
Popis: Most EEG phase synchrony measures are of bivariate nature. Those that are multivariate focus on producing global indices of the synchronization state of the system. Thus, better descriptions of spatial and temporal local interactions are still in demand. A framework for characterization of phase synchrony relationships between multivariate neural time series is presented, applied either in a single epoch or over an intertrial assessment, relying on a proposed clustering algorithm, termed Multivariate Time Series Clustering by Phase Synchrony, which generates fuzzy clusters for each multivalued time sample and thereupon obtains hard clusters according to a circular variance threshold; such cluster modes are then depicted in Time-Frequency-Topography representations of synchrony state beyond mere global indices. EEG signals from P300 Speller sessions of four subjects were analyzed, obtaining useful insights of synchrony patterns related to the ERP and even revealing steady-state artifacts at 7.6 Hz. Further, contrast maps of Levenshtein Distance highlight synchrony differences between ERP and no-ERP epochs, mainly at delta and theta bands. The framework, which is not limited to one synchrony measure, allows observing dynamics of phase changes and interactions among channels and can be applied to analyze other cognitive states rather than ERP versus no ERP.
Databáze: OpenAIRE
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