In recent years, the potential of robot-mediated upper extremity therapy has been widely acknowledged in stroke rehabilitation. The primary focus of rehabilitation robotics has been on building exoskeleton robots as well as devising control strategies that leverage robotic forces to adaptively assist and resist the movements of patients’ impaired arms during repetitive reach-touch exercises. In our single subject case study, a robot presents exercise target positions that are successively more difficult to the patient. This serves to adaptively challenge the patient, while inducing voluntary reach-touch movements. Through data collected during 12 weeks of therapy with a single subject, we demonstrate that a general purpose robot can induce desired therapeutic exercise movements from a patient. In addition, we have observed that the challenge level can be adapted as the patient improves his motor function, which leads to observable improvements in the motor function of the patient.

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