Keller JW, et al. – The physicians performed this motor learning study to examine whether children with Cerebral Palsy (CP) who trained with weight support in a playful, virtual environment would improve upper extremity task performance (i.e. skill acquisition), transfer, and retention, three aspects that indicate whether motor learning might have occurred or not. In this study, they discovered evidence showing the successful acquisition, transfer, and retention of upper extremity skills in children with CP. Thus, they concluded that motor learning occurred when children with CP trained their more affected arm with weight–support in a playful, virtual environment.