<qa>  How many patients with chronic stroke will be randomly assigned to receive CI therapy?Eighty patients with chronic stroke will be randomly assigned to receive either CI therapy or a General Fitness control intervention. Two years after study entry, the patients in the control group will be crossed over to receive CI therapy. Primary outcome measures will be a laboratory motor function test and amount of extremity use in the real-world setting. Changes in psychosocial functioning will also be measured. 