Figure 1. Experimental design, frontal view.

Participants placed their right hand on the lower plate, whereas the artificial hand was placed directly above on the upper plate. The artificial hand's index finger and the lower button were connected via a string. Hence, whenever either the lower button was pressed by the participant (self-agency) or the ring was moved up or down by the experimenter (other-agency), the index finger of the artificial hand moved up or down accordingly. Lateral view. Illustrated is the measurement of the proprioceptive drift. Participants closed their eyes, stretched out their left arm and indicated with their left index finger the perceived height of their right hand. The height of the participant's left index finger was then marked by the experimenter onto the scale paper attached to each side of the table.