Figure 1

Setup of the real mirror (A) and virtual mirror (B) experiments . In the virtual mirror task, the subjects wore a head-mounted display while sitting in front of a table. The left upper extremity of healthy subjects, or the unaffected upper extremity of stroke patients, was placed on the experimental device, which records the angle of the wrist movements. Subjects could see a virtual cup on a virtual table and a virtual upper extremity contralateral to the moving upper extremity through the head-mounted display. The movements of the virtual upper extremity were controlled by the movements of the real moving upper extremity.