In the current paper, we report a large-scale randomized field experiment, conducted among Jewish Israelis during widespread violence. The study examines the effectiveness of a "real world," multichanneled paradoxical thinking intervention, with messages disseminated through various means of communication (i.e., online, billboards, flyers). Over the course of 6 wk, we targeted a small city in the center of Israel whose population is largely rightwing and religious. Based on the paradoxical thinking principles, the intervention involved transmission of messages that are extreme but congruent with the shared Israeli ethos of conflict. To examine the intervention's effectiveness, we conducted a large-scale field experiment (prepost design) in which we sampled participants from the city population (n = 215) and compared them to a control condition (from different places of residence) with similar demographic and political characteristics (n = 320). Importantly, participants were not aware that the intervention was related to the questionnaires they answered. Results showed that even in the midst of a cycle of ongoing violence within the context of one of the most intractable conflicts in the world, the intervention led hawkish participants to decrease their adherence to conflict-supporting attitudes across time. Furthermore, compared with the control condition, hawkish participants that were exposed to the paradoxical thinking intervention expressed less support for aggressive policies that the government should consider as a result of the escalation in violence and more support for conciliatory policies to end the violence and promote a long-lasting agreement. Extreme violence in intergroup conflicts has an immense emotional impact and plays a pivotal role in the perpetuation and intractability of conflicts (3, 4). Thus, finding ways to moderate attitudes in violent times is crucial but often seen as an extremely difficult mission for three major reasons. First, the violence carried by the rival provides clear-cut evidence about its inhumane character and its mal-intentions (5). Second, living in fear and uncertainty can increase group polarization and extremism (6-8). Third, examining scaled-up interventions in field studies poses methodological constraints on implementing a successful intervention and designing rigorous research to assess the interventions' effectiveness (e.g., refs. 9-11).The present research provides evidence of how a psychological intervention can moderate negative attitudes even in the context of widespread violence. It does so by creating a multichanneled campaign based on the theoretical framework of paradoxical thinking (12, 13). Although attempts of promoting peaceful and harmonious intergroup relations among adversary groups have received increasing scholarly awareness, only limited research examined largescale interventions in contexts of widespread violence, when they are needed the most (e.g., refs. 14−15).
Paradoxical ThinkingParadoxical thinking is "the attempt to change attitudes u...