TMS A research staff supervised by a physician will apply the TMS measurement of the cortical excitability and intracortical inhibition/facilitation to the subject. For all TMS procedures, patients will be seated comfortably and instructed to remain as still as they can. The height of the chair will be adjusted so that both the knees and ankles are flexed at 90 degree and the two feet rest on the floor. A tight swim cap will be worn by the subject. The vertex will be marked on the cap. Points that are 1 cm lateral and/or 1cm posterior/anterior are marked on the cap.