Fig. 1

Representation of the ARAT-VR. This four-panel figure simultaneously represents the ARAT-VR environment displayed in the headset and the movements performed by a healthy control subject to realize the task when interacting with the system. a This panel represent the second item of the ARAT-VR and consists of grasping and displacing a virtual cube of 2.5 cm side. b This panel represents the fifth item of the ARAT-VR and consists of pouring water from one virtual glass to another. c This panel represents the eleventh item of the ARAT-VR and consists of grasping, holding and displacing a virtual marble with a thumb and middle finger pinching movement. d This panel represents the thirteenth and least item of the ARAT-VR and consists of touching the mouth (virtually represented by a blue rectangle target) with the tested hand