The goal of this study was to examine the relations of reactive versus proactive aggression to children's anger, as assessed using observational, physiological, and self-report measures. Anger was hypothesized to be related to reactive aggression, but not to proactive aggression. Children (N = 272 second-grade boys and girls) participated in a procedure in which they lost a board game and prize to a confederate who cheated. Skin conductance reactivity and heart rate reactivity were measured throughout the procedure. Following the interaction, children viewed a videotape of the game and self-reported on their level of anger after each turn of the game. Observational coding of children's angry facial expressions and angry nonverbal behaviors was conducted. Reactive aggression, but not proactive aggression, was positively related to skin conductance reactivity and angry nonverbal behaviors, both at an aggregated level and in terms of rate of increase over the time span of the game.

Investigated whether the relation between aggression and the tendency to expect positive outcomes for aggressive behavior is specific to the proactive subtype of aggression (as opposed to the reactive subtype). In a sample of 86 incarcerated adolescent boys ages 13 to 18, we measured outcome expectancies for aggression using audiotaped hypothetical vignettes. For each participant, staff members completed proactive and reactive aggression rating scales. Regression analyses revealed that the relation between aggression and outcome expectancies was indeed specific to proactive aggression. Furthermore, this finding was supported regardless of whether outcome expectancies were assessed using vignettes describing proactive-aggressive behavior or those describing reactive-aggressive behavior. We discuss these findings and argue that interventions to reduce proactive or reactive aggression should differ from each other by addressing the specific social cognitive processes involved in each type of aggression.

Our first goal was to examine the relations among observational, physiological, and self-report measures of children's anger. Our second goal was to investigate whether these relations varied by reactive or proactive aggression. Children (272 second-grade boys and girls) participated in a procedure in which they lost a game and prize to a confederate who cheated. Skin conductance reactivity, heart rate reactivity, selfreports of anger, angry facial expressions, and angry nonverbal behaviors were measured for each turn of the game. We used multi-level regressions to calculate the relations among the 10 pairs of the five anger variables over the course of the game. Six of the 10 pairs of anger variables were positively related. These findings suggest that measuring children's anger using any one approach may not capture the full complexity of children's overall experience and expression of anger. Furthermore, three of the 10 relations were stronger at higher levels of reactive aggression, although none varied by proactive aggression. These findings suggest that reactive aggression is related to greater cohesiveness in the experience and expression of anger than is proactive aggression.

Our primary goal was to examine the correspondence between children's self-reported use and knowledge of display rules for anger following hypothetical vignettes versus following live peer interactions. Our secondary goal was to investigate whether children's self-reported experience and self-reported expression of anger were related their observed anger expression, considered an observational measure of use of display rules for anger. Participants were 274 second-grade children. Children were first interviewed about their use and knowledge of display rules for anger in gameplaying situations depicted through hypothetical vignettes. Several months later, children interacted with a confederate in standardized games designed to simulate the vignettes and answered the same questions about display rules. Children's responses were moderately related across the two contexts. However, following the live interactions, compared to the hypothetical vignettes, children reported feeling less anger, expressing less anger, intending to hide their anger more, and dissembling their anger more. In addition, there were differences in the quality and quantity of strategies for hiding anger that children generated across the two contexts. Observations of anger expression were not related to self-reports of either the experience or expression of anger.

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