Figure 2.
Effect of D2-like activation under highest RP dosage (1 mg) on cortical excitability (control experiment). The control experiment with sham tDCS was performed for the highest RP dosage (1 mg) to observe whether RP alone influences cortical excitability. Shown are baseline-standardized MEP amplitudes after plasticity induction by cathodal and anodal tDCS under placebo medication condition and after 1.0 mg of RP intake without tDCS (Sham stimulation condition). Filled symbols indicate significant deviations of the MEP amplitudes from baseline values (Student's t test, two-tailed, paired samples, p < 0.05).