The mathematical expression of the reward function introduced in Paper I is used in evaluating the dependence of reward on the variety of available experiences, as well as in analyzing the rationale of certain actions aimed at indirect reward maximization. A person can affect the reward content of events by influencing his own estimate of their frequency of occurrence. Hostile acts without any expected direct benefit, or interest in other people's misfortunes can be understood as aiming at such indirect reward enhancement.
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