Figure 1. 2x2 factorial design of the experiment.

Left panels: “View Self” condition, in which the subjects saw their own right hands in a live movie, that is, a movement than was perfectly synchronized with their own. Right panels: “View Other” condition, in which the subjects saw the same hands but in a pre-recorded movie, such that there were small timing differences between the viewed and the executed movements. Upper panels: “Active” condition, in which the lever that lifted the subjects' right hands was pressed by the subjects' left hands. Lower panels: “Passive” condition, in which the lever was pressed by the experimenter. The subjects' right hands were gloved in order to prevent any attempt to distinguish between the view-self and view-other conditions based on morphological differences.