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When tragedy strikes a group, only some group members characteristically rush to the aid of the victims. What motivates the altruism of these exceptional individuals? Here, we provide one set of answers based on data collected before and shortly after the 15 April 2013, Boston Marathon bombings. The results of three studies indicated that Americans who were strongly “fused” with their country were especially inclined to provide various forms of support to the bombing victims. Moreover, the degree to which participants reported perceiving fellow Americans aspsychological kinstatistically mediated links between fusion and pro-group outcomes. Together, these findings shed new light on relationships between personal and group identity, cognitive representations of group members, and personally costly, pro-group actions. [ABSTRACT FROM AUTHOR]

Most social scientists endorse some version of the claim that participating in collective rituals promotes social cohesion. The systematic testing and evaluation of this claim, however, has been prevented by a lack of precision regarding the nature of both "ritual" and "social cohesion" as well as a lack of integration between the theories and findings of the social and evolutionary sciences. By directly addressing these challenges, we argue that a systematic investigation and evaluation of the claim that ritual promotes social cohesion is achievable. We present a general and testable theory of the relationship between ritual, cohesion, and cooperation that more precisely connects particular elements of "ritual," such as causal opacity and emotional arousal, to two particular forms of "social cohesion": group identification and identity fusion. Further, we ground this theory in an evolutionary account of why particular modes of ritual practice would be adaptive for societies with particular resource-acquisition strategies. In setting out our conceptual framework, we report numerous ongoing investigations that test our hypotheses against data from controlled psychological experiments as well as from the ethnographic, archaeological, and historical records. [ABSTRACT FROM AUTHOR]