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. 2000 Sep 15;527(Pt 3):633–639. doi: 10.1111/j.1469-7793.2000.t01-1-00633.x

Figure 3. Size and endurance of the DC stimulation after-effect depends on stimulation duration and current intensity.

Figure 3

Dependency of the size of prolonged motor cortex excitability changes after anodal DC stimulation on current intensity (A) and stimulation duration (B). The MEP amplitudes relative to baseline are plotted against the time course. Filled symbols indicate significant differences (two-tailed t test, paired samples, P < 0.05) from the lowest stimulation intensity of 0.2 mA (A) or the shortest stimulation duration of 1 min (B). A minimum of 0.6 mA current intensity stimulation or a minimum stimulation duration of 3 min was needed to induce stimulation after-effects. Increasing either current intensity or stimulation duration led to prolonged and larger after-effects.