The primary outcome measure is motor-evoked potential (MEP) induced by transcranial magnetic stimulation immediately after the interventional procedure of PAS25-cTBS150. We will compare MEP amplitude in patients with that in healthy volunteers to identify whether depotentiation is weaker in focal dystonia. The secondary outcome measures are MEP amplitudes at other time points after the PAS25-cTBS150 procedure. We will also perform exploratory studies to investigate the effects of interventional procedures of PAS25 and PAS10 alone. We will test the relationship between depotentiation and LTP/LTD-like effects in focal dystonia. We will also study other exploratory outcome measures such as: resting and active motor threshold, MEP recruitment curve, excitability of motor cortical circuits (short- and long-interval intracortical inhibition, and intracortical facilitation) after three different interventional procedures.