 Aim 2: Determine whether and which type of PAS is capable of inducing changes in motor performance of the upper limb paresis and duration Aim 3: Determine whether and which type of PAS is capable of inducing changes in excitability of the corticospinal tract and duration Aim 4: Determine how PAS techniques modify the functional connectivity during movement Aim 5: Determine if connectivity changes during induced movement correlate with clinical improvements Aim 6: Determine whether patients who benefit of a type of PAS have specific anatomical lesion characteristics volume, afferent and efferent white matter fasciculi integrity Aim 7: for healthy subjects: determine the TMS parameters that will influence the response to cerebellar PAS protocols 