Transcranial direct current stimulation
BRAIN
Transcranial direct current stimulation (tDCS) was applied using a Starstim 32 multi-channel stimulation device (Neuroelectrics - Barcelona, Spain). The montage consisted of 5 circular electrodes (3.14 cm²) filled with gel. The total stimulation current consisted of anodal 2mA during 20 min, with a 30 s of ramp up and down at the beginning and end of the stimulation (see Fig. Stimulation areas. Brain renderings showing the component of the E-field normal to the cortical surface (En), positive/negative values indicate the into/out-of the cortical surface direction of the En, leading to an increase/decrease of excitability in cortical pyramidal cells. Group A of participants received stimulation in (