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We have developed a virtual reality based system for the rehabilitation of patients suffering from different neuropathologies such as those brought on by stroke and traumatic brain injury. Our Rehabilitation Gaming System, or RGS, uses a vision based motion capture system with gaming technologies and functionally combines active evaluation, with continuous monitoring and intensive training regimes tuned to the needs of individual patients. Here we assess the validity of the evaluation phase of the RGS by comparing the physical and virtual versions of a diagnostic reaching test with 6 stroke patients. Subsequently we illustrate the ability of our system to provide high resolution information at the level of individual performance.