Fig. 1.

Subjects wore MRI compatible instrumented data gloves that recorded finger movement in real-time. Finger motion was back-projected onto a screen, showing two virtual hand models. On a given trial, motion of the unaffected hand actuated one of the VR hands, located on the same (Veridical) or opposite (Mirror) side relative to the actual hand. In separate, randomly interleaved, control conditions the VR hands were replaced with ellipsoids that rotated about an oblique axis to rule out visual confounds.