From the resulting segment centroid motion and segment rotation data different outcome variables will be calculated. The most relevant ones will define changes in performance with respect to the endpoint motion and with respect to the whole-arm posture, particularly, the evolution of the movement over time (time derivatives) and the fragmentation of the segmental path and posture of the arm while moving towards the different targets. Additional aspects of movement will be explored in order to find the most appropriate descriptors of arm motor performance and changes after the proposed clinical interventions.