Content analysis of 122 social psychology textbooks confirmed that displaced aggression received a surge of attention immediately following J. Dollard, L. W. Doob, N. E. Miller, O. H. Mowrer, and R. R. Sears (1939), but subsequent interest sharply declined. Contemporary texts give it little attention. By contrast, meta-analysis of the experimental literature confirms that it is a robust effect (mean effect size = +0.54). Additionally, moderator analyses showed that: (a) The more negative the setting in which the participant and target interacted, the greater the magnitude of displaced aggression; (b) in accord with N. E. Miller's (1948) stimulus generalization principle, the more similar the provocateur and target, the more displaced aggression; and (c) consistent with the contrast effect (L. Berkowitz & D. A. Knurek, 1969), the intensity of initial provocation is inversely related to the magnitude of displaced aggression.

This article studies the impact of explanatory coherence on the evaluation of explanations. Tested were 4 principles of P. Thagard’s (1989) model for evaluating the coherence of explanations. Study 1 showed that Ss preferred explanations that accounted for more data (breadth) and that were simpler (simplicity or parsimony). Study 2 demonstrated that Ss thought an explanation was stronger when it could, in turn, be explained. Study 3 showed that the evaluation of explanations is comparative, affected by the availability of good alternatives. These results were then successfully simulated using Thagard’s connectionist implementation of his model of explanatory coherence. The data and the simulation, taken together, strongly support the model. Two issues are then discussed: (a) the role of explanatory coherence in social explanation and (b) the relevance of parallel constraint satisfaction processes to social reasoning.

Meta-analytic procedures were used to assess the degree to which aggression-related cues present in the environment facilitate aggressive responding among negatively aroused subjects. The first study, which examined the so-called weapons effect, the effect of name-mediated cues, and other cue effects, showed clear evidence that aggression cues augment aggressive responses in negatively aroused subjects. This was true for the overall analysis and for name-mediated cues, but confirmation of the weapons effect was restricted to cases wherein subject sophistication and evaluation apprehension were low. A second study used partial correlation analysis to assess independently the effects of seven potential mediators of aggression cue effects. Of these, target-based facilitation and harm capacity of the aggressive response were found to mediate the magnitude of cue-facilitated aggression. A third study showed that these mediators augmented cue effects among neutral as well as negatively aroused subjects. These outcomes are interpreted as emphasizing the role of cognitive factors in the expression of both impulsive and nonimpulsive aggression.

Three analyses of published research were undertaken to assess whether diverse laboratory response measures that are intended to measure aggression reflect a common underlying construct. It was found that (a) alternative measures of physical aggression directed by the same subjects against the same target tend to intercorrelate positively within studies, (b) across studies, the correlations between effect-size estimates of physical and written aggression emitted by the same subjects are positive, and (c) physical and written aggressive responses are similarly influenced by theoretically relevant antecedent factors (e.g., personal attack and frustration). The consistent overall pattern of results supports the notion that aggression, defined as intent to harm, is a viable construct that possesses some degree of generality.

Two experiments evaluated the effect of role assignment on intergroup bias. A social categorization model (Brewer & Miller, 1984) predicts a reduction in bias when the basis for assignment to task roles or subgroup composition in a contact situation is category independent (cross‐cut) rather than category related (convergent). Conversely, a model based on social identity theory (Brown & Wade, 1987; Deschamps & Brown, 1983) suggests that when distinct task role assignments converge with category membership, threat to group identity and consequent intergroup bias will be reduced. To clarify these conflicting predictions, we created a cooperative contact setting in which members of two experimentally created groups worked together as a team. During the team membership phase, work roles either converged with or cross‐cut initial group membership. Experiment 1 supported the predictions of the social categorization model; subjects in the cross‐cut condition perceived greater similarity among team members and, in turn, showed less intergroup bias in reward allocation, than did those in the convergent condition. Two variables hypothesized to account for this outcome were the absence of negative task attitudes and the opportunity for personalization. In Expt 2, procedures likely to increase negative task attitudes and reduce personalization were inserted into the procedure of both conditions in an experimental design that paralleled that of Expt 1. Under these conditions, the differential effects of role assignment were eliminated. Taken together, these studies suggest that cross‐cutting role assignment will reduce intergroup bias when it is implemented in a manner that does not arouse negative task attitudes but does provide opportunity for personalization of team mates.

Three studies evaluated the influence of extralegal bias factors on mock jurors' perceptions of hate crimes. Race of victim (African American, Caucasian), race of perpetrator (African American, Caucasian), and political orientation (self-identified conservative, liberal) were manipulated in Experiment 1. Results indicated differential perceptions such that certainty of guilt and sentence ratings were greatest when the victim was African American and the perpetrator was Caucasian. Experiment 2 used a noncollege sample and found results parallel to Experiment 1. Experiment 3 examined the role of peer group and found Caucasians sentenced the defendant more severely when the victim was African American, but only when the defendant's peer group encouraged the attack. This research highlights the importance of examining extralegal factors within the context of hate crimes.

Past research (e.g. Lynch & Haney, 2000) has shown that race plays a significant role in juror decision making in the penalty phase of capital murder trials. This study investigates the possibility of reducing juror bias towards Blacks by altering the content of jury instructions. White and non-White participants received trial information and jury instructions in which the defendant's race (Black or White) and the instruction type (standard or simplified) were manipulated. Participants rendered a sentence recommendation, identified factors they considered to be aggravating or mitigating, and responded to instruction comprehension questions. Bias against the Black defendant was significantly reduced when simplified instructions were used and when the defendant was judged by racially diverse jurors. Simplification also led to better comprehension of sentencing instructions. Implications for capital trials are discussed.

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