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Analysis of a phase synchronized functional network based on the rhythm of brain activities |
Li Ling(李凌)a),Jin Zhen-Lan(金贞兰)a),and Li Bin(李斌)b)† |
a Key Laboratory for NeuroInformation of Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, China; b School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract Rhythm of brain activities represents oscillations of postsynaptic potentials in neocortex, therefore it can serve as an indicator of the brain activity state. In order to check the connectivity of brain rhythm, this paper develops a new method of constructing functional network based on phase synchronization. Electroencephalogram (EEG) data were collected while subjects looking at a green cross in two states, performing an attention task and relaxing with eyes-open. The EEG from these two states was filtered by three band-pass filters to obtain signals of theta (4–7 Hz), alpha (8–13 Hz) and beta (14–30 Hz) bands. Mean resultant length was used to estimate strength of phase synchronization in three bands to construct networks of both states, and mean degree K and cluster coefficient C of networks were calculated as a function of threshold. The result shows higher cluster coefficient in the attention state than in the eyes-open state in all three bands, suggesting that cluster coefficient reflects brain state. In addition, an obvious fronto-parietal network is found in the attention state, which is a well-known attention network. These results indicate that attention modulates the fronto-parietal connectivity in different modes as compared with the eyes-open state. Taken together this method is an objective and important tool to study the properties of neural networks of brain rhythm.
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Received: 09 August 2010
Revised: 22 October 2010
Accepted manuscript online:
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PACS:
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87.19.le
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(EEG and MEG)
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64.60.aq
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(Networks)
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89.75.Fb
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(Structures and organization in complex systems)
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Fund: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 30800242). |
Cite this article:
Li Ling(李凌), Jin Zhen-Lan(金贞兰), and Li Bin(李斌) Analysis of a phase synchronized functional network based on the rhythm of brain activities 2011 Chin. Phys. B 20 038701
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