Figure 3

Position matching behavior of two representative participants, a 24 year old male ( A ) and an 82 year old female ( B ). Each plot shows the mean hand position of the active arm (open symbols) superimposed on the passive arm (closed symbols) for each of the nine target locations. Thin black ellipses show the variability of the mean hand position of the active arm for each target. The areas enclosed by the solid and dashed grey lines show the matching areas of passive and active arms, respectively.