- (1) a single unilateral stroke with stable medical conditions; (2) presence of UN; (3) demonstration of the proximal part movement in the affected upper extremity and a minimum of 20 degrees of active wrist extension and 10 degrees of finger extension; (4) no severe aphasia that hampers command following; (5) no severe cognitive impairments (Mini-Mental State Examination score >= 22); (6) being right-handed premorbidly by self-report.