Constraint-Induced (CI) therapy is one of the few techniques that has been proven with controlled, randomized studies to substantially reduce the incapacitating motor deficit of the more-affected upper extremity of patients with mild to moderately severe chronic strokes. The procedures of CI therapy are relatively simple and are deemed effective because they produce transfer of increased extremity use to the activities of daily living in the real world environment. The therapy involves promoting use of the more-affected upper extremity for 90% of waking hours by constraining the less-affected extremity for two or three consecutive weeks with a resting hand splint and sling or other device which prevents movement of the hand and wrist for activities of daily living. The patients receive a type of training termed "shaping" for 7 hours/day (with rest intervals) for all weekdays during this period (massed practice).