Figure 1.

Kinematic strokes or primitives in man. Panel 1. Elegant skilled movement is expected to arise from a coarticulation of unitary kinematic primitives and depend on the hand motion task. Coarticulation occurs in A in a quadrilateral with an obtuse concave angle (A) and strokes fuse, but this does not occur in one with a more acute angle (b) Panel 2. Learned coarticulation skill is shown to transfer among similar tasks. (both from Sosnik et al. 2004). Panel 3. In victims of stroke, fusion of individual motions and increasing smoothness is observed through rehabilitation (from Rohrer et al. 2002).