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. 2016 Sep 26;10:477. doi: 10.3389/fnhum.2016.00477

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Copyright © 2016 Li, Kang, Qu, Zhou, Wang and Hu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution and reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Task-dependent increase and decrease of the electroencephalogram (EEG) phase synchronization indices across all subjects. (A) The number of electrode pairs exhibiting greater indices during the target condition than that during nontarget condition in depression group. (B) The number of electrode pairs exhibiting greater indices during the target condition than that during nontarget condition in healthy controls. (C) Comparison of the overall increase of PSI among all significant pairs in depressive patients with that in healthy subjects with a two-sample t-test. (D) Comparison of the average value of PSI increase among all significant pairs in depressive patients with that in healthy subjects with a two-sample t-test. (E) The number of electrode pairs exhibiting lower indices during the target task than that during nontarget condition in depression group. (F) The number of electrode pairs exhibiting lower indices during the target task than that during nontarget condition in healthy control. (G) Comparison of the overall decrease of PSI among all significant pairs in depressive patients with that in healthy subjects with a two-sample t-test. (H) Comparison of the average value of PSI decrease among all significant pairs in depressive patients with that in healthy subject with a two-sample t-test.