FIG. 5.

Corticomotor excitability, measured by the motor-evoked potential (MEP) amplitude for the agonist and antagonist muscles involved in motor training. A: changes in the MEP amplitude recorded from the training antagonist (closed squares) and agonist (open diamonds) muscles. MEP amplitudes increased with both sham and anodal tDCS. B: MEP amplitude ratio (post/pre) significantly increased in the MEPagonist muscle compared with the MEPantagonist during p1 for both sham and anodal tDCS. For anodal tDCS this difference was maintained during p2. For both p1 and p2, anodal tDCS resulted in a greater increase in the MEPagonist ratio. Asterisks, P ≤ 0.05. Data are means ± SE.