Arm strength is important for taking care one’s self. Predicting whether arm weakness due to a stroke will or will not improve would allow for more efficient and effective testing of new treatments, and more individualized treatment decisions. This project is supported by the NIH StrokeNet and involves the collaboration of 29 stroke centers across the United States. The VERIFY study will establish the ability of noninvasive transcranial magnetic stimulation and MRI to reliably predict patient outcomes in the important, early period of stroke recovery. Eligibility: Unilateral stroke due to ischemia or intracerebral hemorrhage with Motor deficits in the acutely affected upper extremity