Schematic description of the experimental design. TMS (MEP and CSP) and nerve stimulation (M_MAX) measurements were performed for the left and right (as indicated by two series of measurements) M1 of each participant at Baseline, immediately (Post-Stim) and 20 min (Post-Stim-20) after the end of a 20-min period of neuromodulation brought by either anodal high-density-tDCS (aHD-tDCS) or low frequency-repeated TMS (LF-rTMS).