Figure 2

Stimuli and procedure of the apparent body movement perception task. (A) Illustration of the different pairs of pictures, whose respective sequential presentation induces the illusion of movement of the upper limb of the actor. The actor either raises his right (a and c) or left limb (b and d) with the forearm in supine position and the wrist either in flexion (a and b) or in extension (c and d). The second picture of the pair depicts the position of the forearm and the hand resulting from a pronation of the forearm by a medial rotation movement. (B) Example of the figure prompting the participants to respond by choosing between the two possible paths (labelled A and B) of apparent movement between the two hand positions shown in the pair of pictures presented in the trial. In this specific example, participants choose the perceived path of movement between the two hand positions presented in pair a.