Comparison of kinematic variables between subject groups. Mean values and standard errors are presented (healthy group = black triangles, RHD = red squares, LHD = blue open circles). All data are from the 'no-feedback' condition. a) peak velocity b) number of velocity peaks c) curve index. Int = internal; mid = middle; ext = external. Kinematic performance of healthy subjects was significantly better than patients and performance of LHD patients was significantly better than RHD patients.