Figure 1.

Task design and experimental procedures. A, Schematic of fixed-duration foraging task. In this task, subjects decide sequentially whether to harvest a currently displayed tree or travel to a different tree. Trees yield fewer apples with each successive harvest according to a randomly drawn depletion rate. New trees have an unharvested supply of apples, but entail a travel time (waiting) cost, the length of which varies across two environment types (with long and short travel times). B, Timeline of experimental procedures, which include the collection of questionnaire measurements, an experimental stress or control manipulation, the periodic collection of saliva (cortisol) measurements, and the behavioral task.