Fig. 3

The increase in MEP amplitudes under combination with tDCS. Superimposed raw EMGs of MEPs recorded from a single subject’s FDI in the tDCSa + KIMI and tDCSa conditions are shown (a). Results of the average MEP ratio from the FDI induced in each of the 4 conditions are shown for each time-point (b). Error bars indicate the standard deviation. *: p < 0.05 vs. PRE, **, ‡‡, §§: p < 0.01 vs. PRE (Dunnett’s post-hoc test). †: p < 0.05 vs. tDCSa (Tukey’s post-hoc test)