What is the therapeutic efficacy of manipulating virtual objects for moderately impaired stroke survivors? We will address this question in a study involving 9 subjects with chronic right-side hemiparesis following stroke. Each subject will participate in 3 one-hour therapy sessions per week for 6 weeks. A therapist will evaluate the subjects in separate sessions immediately before the beginning of therapy, right after the completion of therapy, and one month after the completion of therapy. By the end of the study, each subject will have completed 18 therapy sessions within 6 weeks and 3 evaluation sessions over 10 weeks.