Just a decade ago, two psychologists, Swann, and Gómez, developed a new theoretical framework to explain extreme pro-group behaviors: identity fusion theory. Identity fusion refers to a visceral feeling of oneness with a group that motivates individuals to do extraordinary self-sacrifices on behalf of the group or each of its members. Since the formulation of the theory, interdisciplinary researchers of the five continents have conducted dozens of studies on identity fusion, both in laboratory and field settings. Research has deepened into the causes, consequences, underlying mechanisms, and applications of identity fusion. The development of fusion-based research has been steadfast and very prolific. Hence, the first section of the current manuscript includes an updated overview of this fast growing literature. This increasing interest for the theory has, however, been accompanied by a series of misconceptions and untested research assumptions, which we address in the second and third sections of the paper, concluding with a final section suggesting a future research agenda. Our aim is to help those interested in knowing more about identity fusion or about the causal mechanisms that lead individuals to risk their life and personal well-being for a group discarding common misconceptions as well as formulating more precise and nuanced hypotheses for future research.

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Is terrorism just another form of criminal activity, as many nations’ justice systems assume? We offer an initial answer using face-to-face interviews and structured surveys in thirty-five Spanish prisons. Recent theories of extreme sacrifice inform this direct observational and comparative study. Islamist terrorists display levels of self-sacrifice for their primary reference group similar to that of Latino gangs, but greater willingness to sacrifice for primary values than other inmates (non-radical Muslims, Latino gangs, and delinquent bands). This disposition is motivated by stronger perceived injustice, discrimination, and a visceral commitment to such values (risk/radicalization factors). Nevertheless, state authorities, prison staff, and families are (protective/de-radicalization) factors apt to reduce willingness to sacrifice and keep foreign fighters, now being released in large numbers, from returning to terrorism.

Devoted actors—those who share sacred values with a group with which they are fused—are particularly willing to self-sacrifice to defend their group or values when they are threatened. Here, we explore whether they are also prone to aggressive inclinations toward those who endanger their group or convictions. To that end, we examined the effect of threat and the two components of the devoted actor framework—identity fusion and sacred values—on aggressive inclinations. These inclinations were registered with a videogame that allowed participants to destroy ingroup and outgroup symbols. Two experiments indicated that devoted actors reacted to threats to their ingroup and value by increasing aggressive inclinations against the rival group. This effect was apparently mediated by the perceived physical strength of the ingroup versus foes. Results suggest that devoted actors might be more prone to self-sacrifice, but also to attack those who threaten their group or values.