Figure 1.

Experimental protocol and stimuli displays. Upper part shows the four categories of stimuli. Body joint trajectories (in white) are depicted on black screen for illustrative purposes but were not visible during the actual experiment. From left to right (upper horizontal green arrow), stimuli shape change from a scrambled structure to a real walker body structure. From top to bottom (left lateral yellow arrow), stimuli keep the same shape but change from a centered to a translated display. Abbreviations: S-C and C-C for scrambled and canonical centered PLW respectively; S-T and C-T for scrambled and canonical translating PLW. The trajectories of the markers during the whole point light animation (PLA) are shown. The lower part sums up the experimental protocol. During each of the 10 experimental blocks of 48 trials, every condition was randomly presented 12 times for 1 s. During each trial, subjects were told to anchor their gaze on the red cross displayed in the middle of the screen.