Figure 2
From: Systematic changes in position sense accompany normal aging across adulthood
Position matching task. A, Top down workspace view of a typical participant. The robot passively moved the left hand to nine spatial locations (filled symbols) and the right arm was actively moved by the participant to mirror-match each spatial location (open symbols). Ellipses around each of open symbols represent one standard deviation. Areas enclosed by the solid and dashed grey lines show the matching areas of passive and active arms, respectively. B, Overlap of the passive and active arms after mirror transforming data from the left arm to the right side of the workspace. C–E, The data has been modified to illustrate examples of increased variability ( C ), systematic shift (D) and spatial contraction ( E ).