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Changes in (A,B) intra-hemispheric and (C,D) inter-hemispheric theta coherence after 1 month in the three groups in the randomized and organized conditions. Positive values indicate increased theta coherence. The error bars represent 95% confidence interval of the difference between pre- and post-training theta coherence values. Control, control group without training; PMR, progressive muscle relaxation; NGT, Nei Gong training. ∗p < 0.05 (paired samples t-test).
