Fig. 2

Study protocol. A Schedule of the study. The intensive upper limb training and tDCS interventions will be repeated for 5 consecutive days per week for 2 weeks (i.e., 10 days of intervention). During the middle 2 days, the participants will receive only the upper-limb intensive training and self-training. Assessments will be conducted prior to the intervention (t₀, baseline), at the middle of the intervention (t₁, middle), immediately after the intervention (t₂, post), and 1 month after the intervention (t₃, follow-up). B Training schedule per day. Participants will undergo intensive upper limb training for 4 h per day (2 h per half-day) and receive cerebellar tDCS (active or sham) for 20 min during the beginning of the training. They also engage in self-training for 2 h per day (1 h per half-day). C Time course of active (upper panel) and sham (bottom panel) tDCS conditions