Norwegian Constraint-Induced (CI) Therapy Multisite Trial

Inclusion Criteria: * Stroke at more than 5 and less than 26 days ago.(Either first stroke or second stroke without detectable arm weakness after the first stroke). * Modified ranking scale 0-2 before admission * Persistent unilateral arm or hand paresis (Scandinavian Strokes scale (SSS) arm motor function 2-5 or SSS hand motor function 2-4) * Able to lift two fingers with the forearm pronated on the table or able to extend the wrist at least 10 degrees from fully flexed position. * Able to follow a two step command. * Mini Mental State examination score of more than 20 (or more than 16 in combination with expressive aphasia) Exclusion Criteria: * Modified Rankin Scale \> 4 * Unable to give informed consent * Large hemispatial neglect (more than two cm on the Line Bisection Test) * Not expected to survive one year due to other illnesses (eg cardiac, malignancy) * Injury or condition in the affected upper extremity that limited use prior to the stroke. * Other neurological condition affecting motor function