Behavior of the aspiration learner in the repeated PD game.

(A) Payoff matrix. The payoff values for the row player are shown. (B) Concept of satisficing in the aspiration-based reinforcement learning model. The payoff values shown on the horizontal axis are those for the focal player. (C) Relationship between the aspiration level, A, and the approximate (un)conditional strategy, given the payoff matrix shown in (A).