Fig. 3

VR1, VR3, Tablet1, and Tablet3 group video images. a, b. The VR1 and Tablet1 videos were a point of view as if one were performing the prosthetic operation (first-person perspective). The VR1 group watched a 3D video; the Tablet1 group watched a 2D video. c, d. The VR3 and Tablet3 videos showed a real person performing a prosthetic operation where the movement of the scapula to the forearm was easy to observe (third-person perspective). The VR3 group watched a 3D video; the Tablet3 group watched a 2D video