<p>The Hunter-Gatherer Game with Predator.</p>

At each time point, one weather type was randomly selected and participants chose between <b>foraging</b> and <b>waiting</b>. Successful foraging increased energy by 1–2 points, unsuccessful foraging decreased energy by 2 points, and waiting incurred a guaranteed loss of 1 energy point. In threat environments, predator encounters caused an additional loss of 3 energy points.

The blue bar indicates the participant’s current energy level. The figure illustrates a forest overview (left), an example trial without predator threat (center), and an example trial with predator threat (right).</p>