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The goal of the present study was to cross-validate two measures of cultural tightness and looseness, CTL: one used in a comparison within the United States, and the other used in a cross-country comparison. The former was based mainly on aggregation of state laws on controversial issues and religiosity and the latter on assessment of homogeneity in moral values among representative samples across countries. To cross-validate these two measures, both were recomputed at the US divisional level. Despite the differences in their methods of computation, the two measures of CTL correlated highly with each other, r = .92, and with theoretical variables of interest. Further, when the two measures of CTL were used simultaneously to predict theoretical variables of interest, neither remained significant suggesting that they were substitutable with each other. Convergence of results with measures computed via maximally different methods increases the confidence in the validity of these two CTL measures.

Terrorist attacks committed in 2003 by Turkish Islamist extremists threatened the social identity of Turkish Muslims by associating them with terrorism. Using a 2 × 3 experimental design, we categorized Turkish respondents and terrorists as members of a shared superordinate group (“Muslims”) or as members of separate subgroups. When sharing superordinate group membership with terrorists, less identified Turkish respondents experienced ambivalent identification, i.e., they sought to maintain attachment to their group while simultaneously seeking distance from it. Ambivalent identification was reduced when respondents emphasized their typicality as members of a Muslim subgroup that did not include terrorists. The discussion focuses on ambivalent identification as a response to identity threat, and the implications for Islamist terrorism for the social identity of Muslims.