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Schematic of the intervention. For both conditions (active tDCS, solid red line, and placebo stimulation, dashed black line, the electrical current was ramped up over 8 s to 1 mA (blue shaded areas indicate ramps). Active tDCS remained at 1 mA for 20 min followed by fade-out over 8 s from 1 mA to 0 mA. Placebo stimulation remained at 1 mA for only 40 s before fading out over 8 s.
