Figure 4

Tracking and avoidance behaviour. Mutual location probability (y-axis) across normalized time (x-axis) for (A) Experiment 1 and (C) Experiment 2. Average mutual location probability in the 80–100% normalized time window (y-axis) for each condition in (B) Experiment 1 and (D) Experiment 2. Mutual location probability greater than 0.5 or less than 0.5 represents net tracking or avoidance behaviour, respectively. Mutual location probability equal to 0.5 corresponds to random target selection (gray dashed line) and not relying on sensory evidence of an opponent’s movement. The open gray circles and connecting gray lines correspond to individual participants. Box plots show 25th, 50th, and 75th percentiles. Participants did not move in response to their opponent’s movements in the short trial conditions because they had insufficient time to utilize sensory evidence. With more available, the predator and prey respectively exhibited tracking and avoidance behaviour. Thus, with more available time, participants relied on sensory evidence of their opponent’s actions before selecting a target.