tDCS administration
The tDCS was applied on three consecutive days (the first and last sessions were performed inside the MRI scanner, collecting fMRI data before, during, and after the stimulation), and participants were randomized into one of three groups: cathodal tDCS, anodal tDCS, and sham tDCS. Anodal and cathodal configurations are reported in For each tDCS session, tDCS was applied at 2 mA for 20 min using the StarStim system (Neuroelectrics, Spain) through MRI-compatible electrodes (contact surface of about 20 cm