Figure 6. Stag-hunt game with two hunters: a human subject and a computer agent.

The aim of the hunters (red and green circles) is to catch stag (big square) or rabbit (small squares). The hunters and the stag can move to adjacent states, while the rabbits are stationary. At each trial, both hunters and the stag move sequentially; the stag moved first, the subject moved next, and the computer moved last. Each round finishes when either of the hunters caught a prey or when a maximum number of moves had expired.