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. 2005 Jul 7;568(Pt 1):291–303. doi: 10.1113/jphysiol.2005.092429

Figure 1. tDCS shifts the slope of the input–output curve polarity-specifically.

Figure 1

The MEP amplitudes (means ±s.e.m.) at 100, 110, 130 and 150% of resting MT (RMT) are shown for the intra-tDCS conditions (A) and the short- (B) and long-lasting (C) after-effects. During tDCS, cathodal stimulation diminishes the MEP-amplitude relative to no-tDCS values, whereas anodal tDCS tends to enhance it. Due to the experimental protocol, the no-tDCS (non) curves used for comparisons in the anodal and cathodal intra-tDCS conditions are identical (applies also to the following figures). For the after-effects, the direction of the current-induced MEP amplitude changes is similar to the effects during stimulation, but the anodal tDCS-elicited effects are more clear-cut here. Here, no-tDCS (non) values represent the ‘before-tDCS’ baselines and are different for the anodal and cathodal conditions (applies also to the following figures). *P < 0.05, Fisher's LSD test, comparing the respective tDCS and no-tDCS values.