FIG. 2.

Spatial hand kinematics with different background and perturbation conditions from an exemplar subject. A: hand kinematics resulting from the imposed background loads (light gray = 1 Nm; dark gray = 2 Nm; black = 3 Nm) and perturbations (solid = 1.25 Nm; dashed = 2.5 Nm). The circle in each panel indicates the spatial target that subjects were required to achieve quickly and accurately following perturbation onset.