t-DCS
We used the neuroConn DC-Stimulator Plus by NeuroCare (Munich, Germany) with 5 × 7 cm electrodes (rubber electrodes placed within sponges soaked with isotonic salt solution) centered at the midline, 1–2 cm below the inion (active) and on the lateral upper arm (reference). t-DCS was applied for 20 min at 2 mA [