Fig. 3.

Schematics of the four experimental sessions. In all four sessions, observers’ binocular gaze point was monitored at 1000 Hz with an Eyelink II eyetracker. a In session 1, observers smoothly moved their right index finger from right to left and back, directly above the leap motion controller. The on-screen Gabor target moved with the observers’ finger. b In session 2, observers’ hands were motionless and the Gabor target moved right to left and back, replaying one of the finger movements executed in session 1. c In session 3, observers smoothly moved their right index finger backward and forward, directly above the leap motion controller. The on-screen Gabor target moved in stereoscopic depth with the observers’ finger. d In session 4, observers’ hands were motionless and the Gabor target moved backward and forward, replaying one of the finger movements executed in session 3