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Title: Spontaneous brain network activity: Analysis of its temporal complexity.
Austin Authors: Pedersen, Mangor;Omidvarnia, Amir;Walz, Jennifer M;Zalesky, Andrew;Jackson, Graeme D 
Affiliation: The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Victoria, Australia
Department of Psychiatry, Melbourne Neuropsychiatry Centre, The University of Melbourne, Victoria, Australia
Melbourne School of Engineering, The University of Melbourne, Victoria, Australia
Department of Neurology, Austin Health, Heidelberg, Victoria, Australia
Issue Date: 1-Jun-2017 2017-06-01
Publication information: Network neuroscience (Cambridge, Mass.) 2017; 1(2): 100-115
Abstract: The brain operates in a complex way. The temporal complexity underlying macroscopic and spontaneous brain network activity is still to be understood. In this study, we explored the brain's complexity by combining functional connectivity, graph theory, and entropy analyses in 25 healthy people using task-free functional magnetic resonance imaging. We calculated the pairwise instantaneous phase synchrony between 8,192 brain nodes for a total of 200 time points. This resulted in graphs for which time series of clustering coefficients (the "cliquiness" of a node) and participation coefficients (the between-module connectivity of a node) were estimated. For these two network metrics, sample entropy was calculated. The procedure produced a number of results: (1) Entropy is higher for the participation coefficient than for the clustering coefficient. (2) The average clustering coefficient is negatively related to its associated entropy, whereas the average participation coefficient is positively related to its associated entropy. (3) The level of entropy is network-specific to the participation coefficient, but not to the clustering coefficient. High entropy for the participation coefficient was observed in the default-mode, visual, and motor networks. These results were further validated using an independent replication dataset. Our work confirms that brain networks are temporally complex. Entropy is a good candidate metric to explore temporal network alterations in diseases with paroxysmal brain disruptions, including schizophrenia and epilepsy.
DOI: 10.1162/NETN_a_00006
PubMed URL: 29911666
Type: Journal Article
Subjects: Brain networks
Graph theory
Instantaneous phase synchrony
Sample entropy
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