Figure 1. Selected frames from the movie stimuli in each experiment.

Figure (a) shows the animated stimuli of the Aggressive Interaction (AI) condition in Experiments 1 and 2, in which one geometric figure crashes into the other. Figure (b) shows the animated stimuli of the No Interaction (NI) condition in Experiment 1, in which the two geometric figures moved independently and without contact. Figure (c) shows the animated stimuli in Experiment 2, in which two geometric figures interact in the same way as in (a), but the third figure moves independently.