The psychology of intergroup relations was grounded in intragroup processes.

Although Glowacki proposed that peace developed from the relatively recent advent of intergroup norms and tolerance for out-group members, we submit that (a) positive intergroup relations developed from a psychology grounded in the regulation of intragroup relations, (b) the "default" intergroup orientation is uncertainty, and (c) positive intergroup relations likely existed early in our evolutionary history.

Uncovering the multifaceted-self in the domain of negative traits: on the muted expression of negative self-knowledge.

The multifaceted-self effect is the ascription of more traits to self than others. Consensus is that this effect occurs for positive, but not negative, traits. We propose that the effect also occurs for negative traits when they can be endorsed with low intensity ("I am a little bit lazy"), thereby circumventing self-protection concerns.

Reduction of interindividual-intergroup discontinuity: the role of leader accountability and proneness to guilt.

Two experiments contrasted interactions between group leaders with interactions between individuals in a mixed-motive setting. Consistent with the idea that being accountable to the in-group implies normative pressure to benefit the in-group, Experiment 1 found that accountable leaders were more competitive than individuals. Consistent with the idea that being unaccountable to the in-group implies normative pressure to be cooperative and that high guilt proneness provides motivation to be moral, Experiment 2 found that when guilt proneness was high, unaccountable leaders were less competitive than accountable leaders and did not differ significantly from individuals.

Interindividual-intergroup discontinuity as a function of trust and categorization: the paradox of expected cooperation.

Two experiments used a 3-choice variation of the prisoner's dilemma game to explore the paradoxical implications of expected cooperation of other groups and individuals for competitiveness and cooperativeness. Experiment 1 found that an experimental manipulation of opponent trustworthiness influenced the tendency of both groups and individuals to cooperate but had no significant effect on the tendency of groups and individuals to compete--possibly because of the perceived unfairness of competing with a trustworthy other. Experiment 2 found that an experimental manipulation of categorization increased the tendency of same-category groups and individuals to cooperate (as in Experiment 1) and also increased the tendency of same-category groups, but not individuals, to compete (unlike in Experiment 1).

Clarifying the role of the "other" category in the self-esteem IAT.

A. Karpinski (2004) recently criticized Implicit Association Test (IAT) measures of self-esteem, arguing that their measurements of self-associations are compromised by their contrasting self with a putatively extremely negative second category, the nonspecific other. The present data show, to the contrary, that the nonspecific other category in the self-esteem IAT is near neutral in valence.

Beyond the group mind: a quantitative review of the interindividual-intergroup discontinuity effect.

This quantitative review of 130 comparisons of interindividual and intergroup interactions in the context of mixed-motive situations reveals that intergroup interactions are generally more competitive than interindividual interactions. The authors identify 4 moderators of this interindividual-intergroup discontinuity effect, each based on the theoretical perspective that the discontinuity effect flows from greater fear and greed in intergroup relative to interindividual interactions. Results reveal that each moderator shares a unique association with the magnitude of the discontinuity effect.