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Relationship between the percentage change of COP complexity after real tDCS and complexity before tDCS in dual-task condition. It was observed that the percentage change of complexity after real tDCS was correlated with the complexity before tDCS in dual-task condition (R = −0.39, p = 0.05) and those demonstrated lower COP complexity before tDCS increased more after tDCS. This might indicate that tDCS had a greater effect on people with lower complexity
