Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 468, Issue -, Pages 566-577Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2016.10.068
Keywords
Acupuncture; Electroencephalogram; Power spectral density; Functional brain network; Synchronization likelihood
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Funding
- National Natural Science Foundation of China [61302002]
- Natural Science Foundation of Tianjin City [14JCQNJC01200]
- Tangshan Technology Research and Development Program [14130223B]
- Natural Science Foundation of Hebei Province [F2014208013]
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Electroencephalogram (EEG) signal evoked by acupuncture stimulation at Zusanli acupoint is analyzed to investigate the modulatory effect of manual acupuncture on the functional brain activity. Power spectral density of EEG signal is first calculated based on the autoregressive Burg method. It is shown that the EEG power is significantly increased during and after acupuncture in delta and theta bands, but decreased in alpha band. Furthermore, synchronization likelihood is used to estimate the nonlinear correlation between each pairwise EEG signals. By applying a threshold to resulting synchronization matrices, functional networks for each band are reconstructed and further quantitatively analyzed to study the impact of acupuncture on network structure. Graph theoretical analysis demonstrates that the functional connectivity of the brain undergoes obvious change under different conditions: pre-acupuncture, acupuncture, and post-acupuncture. The minimum path length is largely decreased and the clustering coefficient keeps increasing during and after acupuncture in delta and theta bands. It is indicated that acupuncture can significantly modulate the functional activity of the brain, and facilitate the information transmission within different brain areas. The obtained results may facilitate our understanding of the long-lasting effect of acupuncture on the brain function. (C) 2016 Elsevier B.V. All rights reserved.
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