Affirmation, acknowledgment of in-group responsibility, group-based guilt, and support for reparative measures.

Three studies, 2 conducted in Israel and 1 conducted in Bosnia and Herzegovina, demonstrated that affirming a positive aspect of the self can increase one's willingness to acknowledge in-group responsibility for wrongdoing against others, express feelings of group-based guilt, and consequently provide greater support for reparation policies. By contrast, affirming one's group, although similarly boosting feelings of pride, failed to increase willingness to acknowledge and redress in-group wrongdoing. Studies 2 and 3 demonstrated the mediating role of group-based guilt.

Two to tango: effects of collaboration and disagreement on dyadic judgment.

Four studies examined dyadic collaboration on quantitative estimation tasks. In accord with the tenets of "naïve realism," dyad members failed to give due weight to a partner's estimates, especially those greatly divergent from their own. The requirement to reach joint estimates through discussion increased accuracy more than reaching agreement through a mere exchange of numerical "bids.

Happiness and memory: affective significance of endowment and contrast.

Three studies (two conducted in Israel and one in the United States) examined associations between self-rated dispositional happiness and tendencies to treat memories of positive and negative events as sources of enhanced or attenuated happiness through the use of "endowment" and "contrast." Although participants generally endorsed items describing happiness-enhancing tendencies more than happiness-diminishing ones, self-reported happiness was associated with greater endorsement of "positive endowment" items and less endorsement of "negative endowment" items, and also with less endorsement of items that involved contrasting the present with happier times in the past. Only in the American sample, however, was happiness associated with greater endorsement of items that involved contrasting the present with less happy times in the past.

The name of the game: predictive power of reputations versus situational labels in determining prisoner's dilemma game moves.

Two experiments, one conducted with American college students and one with Israeli pilots and their instructors, explored the predictive power of reputation-based assessments versus the stated "name of the game" (Wall Street Game vs. Community Game) in determining players' responses in an N-move Prisoner's Dilemma. The results of these studies showed that the relevant labeling manipulations exerted far greater impact on the players' choice to cooperate versus defect--both in the first round and overall--than anticipated by the individuals who had predicted their behavior.

Local and global judgments of confidence.

Studies of calibration have shown that people's mean confidence in their answers (local confidence) tends to be greater than their overall estimate of the percentage of correct answers (global confidence). Moreover, whereas the former exhibits overconfidence, the latter often exhibits underconfidence. Three studies present evidence that global underconfidence reflects a failure to make an allowance for correct answers that are likely to result from mere guessing and can be eliminated by informing participants of the dubious normative status of estimates below 50% (i.