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. 2016 Jan 14;6:19280. doi: 10.1038/srep19280

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The change in VEP amplitude from baseline after 20 minutes of anodal, cathodal or sham tDCS is shown for amblyopic (A; n = 21), non-amblyopic (B; n = 21) and control (C; n = 12) eyes. Positive values indicate an improvement. Measurements were made directly after (Post) and 30 minutes after (Post30) simulation. For controls, reducing the simulation duration to 10 minutes did not change the pattern of tDCS effects (D; n = 15). * = significant change from baseline, “ = significant difference from sham (paired t-test, p < 0.05).