Minimizing the costs that others impose upon oneself and upon those in whom one has a fitness stake, such as kin and allies, is a key adaptive problem for many organisms. Our ancestors regularly faced such adaptive problems (including homicide, bodily harm, theft, mate poaching, cuckoldry, reputational damage, sexual aggression, and the infliction of these costs on one's offspring, mates, coalition partners, or friends). One solution to this problem is to impose retaliatory costs on an aggressor so that the aggressor (...) and other observers will lower their estimates of the net benefits to be gained from exploiting the retaliator in the future. We posit that humans have an evolved cognitive system that implements this strategy – deterrence – which we conceptualize as a revenge system. The revenge system produces a second adaptive problem: losing downstream gains from the individual on whom retaliatory costs have been imposed. We posit, consequently, a subsidiary computational system designed to restore particular relationships after cost-imposing interactions by inhibiting revenge and motivating behaviors that signal benevolence for the harmdoer. The operation of these systems depends on estimating the risk of future exploitation by the harmdoer and the expected future value of the relationship with the harmdoer. We review empirical evidence regarding the operation of these systems, discuss the causes of cultural and individual differences in their outputs, and sketch their computational architecture. (shrink)

Achievement flow involves total absorption in an activity, high concentration without effort and merging of thought and action. The authors propose that achievement flow is facilitated by dynamic alternatives between low positive affect (“seeing difficulty”) and high positive affect (“mastering difficulty”). Consistent with this hypothesis, three studies showed that traits associated with reduced positive affect (avoidant adult attachment, schizoid-like personality style, introversion) and traits supportive of restoring positive affect (mastery orientation) predicted achievement flow, as assessed with a new operant motive (...) test (OMT). Achievement flow motives were further found to be associated with flow experiences in achievement tasks (Study 1), intrinsic motivation in an academic context (Study 2), and volitional facilitation as assessed by removal of Stroop interference after experimentally induced difficulty and positive affect (Study 3). These findings offer converging evidence that flow experiences arise from dynamic changes in positive affect. (shrink)

This commentary focuses on how third parties impact the course of acts of revenge based on their world views, such as belief in a just world. Assuming this belief to be true, the following questions could be asked: (a) What are the consequences of a third party's worldview in terms of secondary victimization? (b) Are bystanders actually aware of these consequences? (c) If so, then why do they let it happens?