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The plots display the mean accuracy rate (A) and mean RT (B) of the two-back task, the mean interference score of the flanker task (C) and the mean switching cost of the switching task (D) in each group (anodal transcranial direct current stimulation and sham transcranial direct current stimulation) at pretest, posttest and follow-up. Error bars represent standard errors of the mean. atDCS, anodal transcranial direct current stimulation.
