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Sample of input-output (IO) recruitment curves for three tDCS conditions obtained before tDCS and after 10 min of tDCS (a–f). The IO curve is enhanced by 0.1 or 0.8 mA anodal tDCS and 0.1 mA cathodal tDCS (h–j), inhibited by 0.8 mA cathodal tDCS (k), and is unaltered by sham tDCS (g). Data are shown as the mean ± SEM. Asterisk (∗) denotes significance between pre- and post-tDCS at the same stimulation intensity (unpaired t-test, ∗p < 0.05, ∗∗p < 0.01).
