Abstract
Whereas politicians broker peace deals, it falls to the public to embrace peace and help sustain it. The legacy of conflicts can make it difficult for people to support reconciling and reintegrating with former enemies. Here we create a five-minute media intervention from interviews we conducted with Colombian Revolutionary Armed Forces (FARC) ex-combatants in a Colombian demobilization camp and non-FARC Colombians in neighbouring communities. We show that exposure to the media intervention humanizes FARC ex-combatants and increases support for peace and reintegration. These effects persisted at least three months post-exposure, were replicated in an independent sample of non-FARC Colombians and affected both attitudes (for example, support for reintegration policies) and behaviour (for example, donations to organizations supporting ex-combatants). As predicted, the intervention’s effects were mediated by changing conflict-associated cognitions—reducing the belief that ex-combatants are unwilling and unable to change—beyond affective pathways (for example, increased empathy or reduced prejudice).
This is a preview of subscription content, access via your institution
Access options
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$32.99 / 30 days
cancel any time
Subscribe to this journal
Receive 12 digital issues and online access to articles
$119.00 per year
only $9.92 per issue
Buy this article
- Purchase on SpringerLink
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout

Similar content being viewed by others
Data availability
The data files that support the findings of the studies are available at https://osf.io/dnx7w/?view_only=39e2923b37464a7ba5a70f30991b1abf.
Code availability
All custom code that supports the findings of the studies is available at https://osf.io/dnx7w/?view_only=39e2923b37464a7ba5a70f30991b1abf.
References
Allansson, M., Melander, E. & Themnér, L. Organized violence, 1989–2016. J. Peace Res. 54, 574–587 (2017).
Bar-Tal, D. & Halperin, E. in Intergroup Conflicts and Their Resolution: A Social Psychological Perspective (ed. Bar-Tal, D.) 217–240 (Psychology Press, 2011).
Casey, N. Colombia’s peace deal promised a new era. So why are these rebels rearming? New York Times (17 May 2019); https://www.nytimes.com/2019/05/17/world/americas/colombia-farc-peace-deal.html
Flores, T. E. & Vargas, J. F. Colombia: democracy, violence, and the peacebuilding challenge. Confl. Manage. Peace Sci. 35, 581–586 (2018).
López López, W. et al. Forgiving former perpetrators of violence and reintegrating them into Colombian civil society: noncombatant citizens’ positions. Peace Confl. 24, 201–215 (2018).
Matanock, A. M. & Garbiras-Díaz, N. Considering concessions: a survey experiment on the Colombian peace process. Confl. Manage. Peace Sci. 35, 637–655 (2018).
Posada-Carbó, E. The difficult road to peace in Colombia. Curr. Hist. 116, 74–76 (2017).
Ross, L. & Ward, A. in Advances in Experimental Social Psychology (ed. Zanna, M. P.) Vol. 27, 255–304 (Academic Press, 1995).
Mousa, S. Building social cohesion between Christians and Muslims through soccer in post‐ISIS Iraq. Science 369, 866–870 (2020).
Paluck, E. L., Green, S. A. & Green, D. P. The contact hypothesis re-evaluated. Behav. Public Policy 3, 129–158 (2019).
Paolini, S., Harwood, J., Hewstone, M. & Neumann, D. L. Seeking and avoiding intergroup contact: future frontiers of research on building social integration. Soc. Pers. Psychol. Compass 12, e12422 (2018).
Pettigrew, T. F. & Tropp, L. R. A meta-analytic test of intergroup contact theory. J. Pers. Soc. Psychol. 90, 751–783 (2006).
Al Ramiah, A. & Hewstone, M. Intergroup contact as a tool for reducing, resolving, and preventing intergroup conflict: evidence, limitations, and potential. Am. Psychol. 68, 527–542 (2013).
Tropp, L. R. in The Social Psychology of Intractable Conflict (eds Halperin, E. & Sharvit, K.) Vol. 1, 159–171 (Springer, 2015).
Broockman, D. & Kalla, J. Durably reducing transphobia: a field experiment on door-to-door canvassing. Science 352, 220–224 (2016).
Amichai-Hamburger, Y. & McKenna, K. Y. A. The contact hypothesis reconsidered: interacting via the internet. J. Comput. Mediat. Commun. 11, 825–843 (2006).
Bruneau, E., Hameiri, B., Moore-Berg, S. L. & Kteily, N. Intergroup contact reduces dehumanization and meta-dehumanization: cross-sectional, longitudinal and quasi-experimental evidence from 16 samples in 5 countries. Pers. Soc. Psychol. Bull. 47, 906–920 (2021).
Taylor, V. J., Valladares, J. J., Siepser, C. & Yantis, C. Interracial contact in virtual reality: best practices. Policy Insights Behav. Brain Sci. 7, 132–140 (2020).
Bruneau, E. G. & Saxe, R. The power of being heard: the benefits of ‘perspective-giving’ in the context of intergroup conflict. J. Exp. Soc. Psychol. 48, 855–866 (2012).
Paluck, E. L. Reducing intergroup prejudice and conflict using the media: a field experiment in Rwanda. J. Pers. Soc. Psychol. 96, 574–587 (2009).
Schiappa, E., Gregg, P. B. & Hewes, D. E. The parasocial contact hypothesis. Commun. Monogr. 72, 92–115 (2005).
Bilali, R. & Vollhardt, J. R. Priming effects of a reconciliation radio drama on historical perspective-taking in the aftermath of mass violence in Rwanda. J. Exp. Soc. Psychol. 49, 144–151 (2013).
Bilali, R., Vollhardt, J. R. & Rarick, J. R. D. Assessing the impact of a media-based intervention to prevent intergroup violence and promote positive intergroup relations in Burundi. J. Community Appl. Soc. Psychol. 26, 221–235 (2016).
Hameiri, B., Porat, R., Bar-Tal, D. & Halperin, E. Moderating attitudes in times of violence through paradoxical thinking intervention. Proc. Natl Acad. Sci. USA 113, 12105–12110 (2016).
Murrar, S. & Brauer, M. Overcoming resistance to change: using narratives to create more positive intergroup attitudes. Curr. Dir. Psychol. Sci. 28, 164–169 (2019).
Joyce, N. & Harwood, J. Improving intergroup attitudes through televised vicarious intergroup contact: social cognitive processing of ingroup and outgroup information. Commun. Res. 41, 627–643 (2014).
Bruneau, E. G., Cikara, M. & Saxe, R. Minding the gap: narrative descriptions about mental states attenuate parochial empathy. PLoS ONE 10, e0140838 (2015).
Bruneau, E., Lane, D. & Saleem, M. Giving the underdog a leg up: a counternarrative of nonviolent resistance improves sustained third-party support of a disempowered group. Soc. Psychol. Pers. Sci. 8, 746–757 (2017).
Bruneau, E., Kteily, N. & Falk, E. Interventions highlighting hypocrisy reduce collective blame of Muslims for individual acts of violence and assuage anti-Muslim hostility. Pers. Soc. Psychol. Bull. 44, 430–448 (2018).
Taylor, L. K. Transitional justice, demobilization, and peacebuilding amid political violence: examining individual preferences in the Caribbean coast of Colombia. Peacebuilding 3, 90–108 (2015).
Lees, J. & Cikara, M. Inaccurate group meta-perceptions drive negative out-group attributions in competitive contexts. Nat. Hum. Behav. 4, 279–286 (2020).
Hornik, R. & Woolf, K. D. Using cross‐sectional surveys to plan message strategies. Soc. Mark. Q. 5, 34–41 (1999).
Wienand, S. & Tremaria, S. Paramilitarism in a post-demobilization context? Insights from the Department of Antioquia in Colombia. Eur. Rev. Lat. Am. Caribb. Stud. 103, 25–50 (2017).
Orosz, G. et al. What predicts anti‐Roma prejudice? Qualitative and quantitative analysis of everyday sentiments about the Roma. J. Appl. Soc. Psychol. 48, 317–328 (2018).
Goldenberg, A. et al. Testing the impact and durability of group malleability intervention in the context of the Israeli–Palestinian conflict. Proc. Natl Acad. Sci. USA 115, 696–701 (2018).
Halperin, E., Russell, A. G., Trzesniewski, K. H., Gross, J. J. & Dweck, C. S. Promoting the Middle East peace process by changing beliefs about group malleability. Science 333, 1767–1769 (2011).
Kteily, N. & Bruneau, E. Backlash: the politics and real-world consequences of minority group dehumanization. Pers. Soc. Psychol. Bull. 43, 87–104 (2017).
Kteily, N. S. & Bruneau, E. Darker demons of our nature: the need to (re)focus attention on blatant forms of dehumanization. Curr. Dir. Psychol. Sci. 26, 487–494 (2017).
Kteily, N., Bruneau, E., Waytz, A. & Cotterill, S. The ascent of man: theoretical and empirical evidence for blatant dehumanization. J. Pers. Soc. Psychol. 109, 901–931 (2015).
Bruneau, E. & Kteily, N. The enemy as animal: symmetric dehumanization during asymmetric warfare. PLoS ONE 12, e0181422 (2017).
Bar-Tal, D. & Hameiri, B. Interventions for changing well-anchored attitudes in the context of intergroup conflict. Soc. Pers. Psychol. Compass 14, e12534 (2020).
Cohen-Chen, S., Halperin, E., Crisp, R. J. & Gross, J. J. Hope in the Middle East: malleability beliefs, hope, and the willingness to compromise for peace. Soc. Psychol. Pers. Sci. 1, 67–75 (2014).
Batson, C. D. & Ahmad, N. Y. Using empathy to improve intergroup attitudes and relations. Soc. Issues Policy Rev. 3, 141–177 (2009).
Pettigrew, T. F. & Tropp, L. R. How does intergroup contact reduce prejudice? Meta-analytic tests of tree mediators. Eur. J. Soc. Psychol. 38, 922–934 (2008).
Tropp, L. R. & Pettigrew, T. F. Differential relationships between intergroup contact and affective and cognitive dimensions of prejudice. Pers. Soc. Psychol. Bull. 31, 1145–1158 (2005).
Haddock, G., Zanna, M. P. & Esses, V. M. Assessing the structure of prejudicial attitudes: the case of attitudes toward homosexuals. J. Pers. Soc. Psychol. 65, 1105–1118 (1993).
Capone, F. An overview of the DDR process established in the aftermath of the revised peace agreement between the Colombian government and the FARC: finally on the right track? Glob. Jurist 18, 20170007 (2018).
Paolini, S. & McIntyre, K. Bad is stronger than good for stigmatized, but not admired outgroups: meta-analytical tests of intergroup valence asymmetry in individual-to-group generalization experiments. Pers. Soc. Psychol. Rev. 23, 3–47 (2019).
Greenaway, K. H., Wright, R. G., Willingham, J., Reynolds, K. J. & Haslam, S. A. Shared identity is key to effective communication. Pers. Soc. Psychol. Bull. 41, 171–182 (2015).
Mackie, D. M., Worth, L. T. & Asuncion, A. G. Processing of persuasive in-group messages. J. Pers. Soc. Psychol. 58, 812–822 (1990).
Maoz, I., Ward, A., Katz, M. & Ross, L. Reactive devaluation of an “Israeli” vs. “Palestinian” peace proposal. J. Confl. Resolut. 46, 515–546 (2002).
Kubin, E., Puyear, C., Schein, C. & Gray, K. Personal experiences bridge moral and political divides better than facts. Proc. Natl Acad. Sci. USA 118, e2008389118 (2021).
Levy, A. Disarming the mind: reintegrating ex-combatants in Colombia. Nature https://doi.org/10.1038/d41586-018-05044-w (2018).
Hameiri, B. & Moore-Berg, S. L. Intervention tournaments: an overview of concept, design, and implementation. Perspect. Psychol. Sci. (in the press).
Milkman, K. M. et al. Megastudies improve the impact of applied behavioral science. Nature 600, 478–483 (2021).
Rosseel, Y. lavaan: an R package for structural equation modeling. J. Stat. Softw. 48, 1–36 (2012).
Paluck, E. L., Porat, R., Clark, C. S. & Green, D. P. Prejudice reduction: progress and challenges. Annu. Rev. Psychol. 72, 533–560 (2021).
Newman, D. A. Missing data: five practical guidelines. Organ. Res. Methods 17, 372–411 (2014).
Graham, J. W. Missing data analysis: making it work in the real world. Annu. Rev. Psychol. 60, 549–576 (2009).
Rydell, R. J., Hugenberg, K., Ray, D. & Mackie, D. M. Implicit theories about groups and stereotyping: the role of group entitativity. Pers. Soc. Psychol. Bull. 33, 549–558 (2007).
Frey, F. E. & Tropp, L. R. Being seen as individuals versus as group members: extending research on metaperception to intergroup contexts. Pers. Soc. Psychol. Rev. 10, 265–280 (2006).
Vorauer, J. D., Hunter, A. J., Main, K. J. & Roy, S. A. Meta-stereotype activation: evidence from indirect measures for specific evaluative concerns experienced by members of dominant groups in intergroup interaction. J. Pers. Soc. Psychol. 78, 690–707 (2000).
Vorauer, J. D., Main, K. J. & O’Connell, G. B. How do individuals expect to be viewed by members of lower status groups? Content and implications of meta-stereotypes. J. Pers. Soc. Psychol. 75, 917–937 (1998).
Moore-Berg, S. L., Ankori-Karlinsky, L., Hameiri, B. & Bruneau, E. Exaggerated meta-perceptions predict intergroup hostility between American political partisans. Proc. Natl Acad. Sci. USA 117, 14864–14872 (2020).
Haslam, N., Bastian, B., Bain, P. & Kashima, Y. Psychological essentialism, implicit theories, and intergroup relations. Group Process. Intergroup Relat. 9, 63–76 (2006).
Tofighi, D. & Thoemmes, F. Single-level and multilevel mediation analysis. J. Early Adolesc. 34, 93–119 (2014).
Dovidio, J. F., Love, A., Schellhaas, F. M. H. & Hewstone, M. Reducing intergroup bias through intergroup contact: twenty years of progress and future directions. Group Process. Intergroup Relat. 20, 606–620 (2017).
Waytz, A., Young, L. L. & Ginges, J. Motive attribution asymmetry for love vs. hate drives intractable conflict. Proc. Natl Acad. Sci. USA 111, 15687–15692 (2014).
Kteily, N., Hodson, G. & Bruneau, E. They see us as less than human: metadehumanization predicts intergroup conflict via reciprocal dehumanization. J. Pers. Soc. Psychol. 110, 343–370 (2016).
Moore-Berg, S. L., Hameiri, B. & Bruneau, E. The prime psychological suspects of toxic political polarization. Curr. Opin. Behav. Sci. 34, 199–204 (2020).
Casas-Casas, A., Mendez, N. & Pino, J. F. Trust and prospective reconciliation: evidence from a protracted armed conflict. J. Peacebuilding Dev. 15, 298–315 (2020).
Hurtado-Parrado, C. et al. Emotion regulation and attitudes toward conflict in Colombia: effects of reappraisal training on negative emotions and support for conciliatory and aggressive statements. Front. Psychol. 10, 908 (2019).
Maya-Jariego, I., De La Peña-Leiva, A., Arenas-Rivera, C. & Alieca, D. Personal networks, social media, and community cohesion in the strategies of peace-building agents in Colombia to counteract the segregation of displaced populations. J. Community Psychol. 47, 1300–1312 (2019).
Acknowledgements
The research was funded by internal funding provided by the University of Pennsylvania to Emile Bruneau. The funder had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript. We thank Pirata Films for their collaboration, the final creation of the media intervention videos and subtitling into English. We also thank the people from the Dabeiba reintegration camp and neighbouring communities for their hospitality and generosity.
Author information
Authors and Affiliations
Contributions
E.B. initiated the research, with support from A.C. E.B., A.C., B.H. and N.K. contributed to the study design. E.B., A.C., B.H. and N.K. conducted the research. B.H. led the data analysis, with support from E.B. and N.K. E.B., B.H. and N.K. wrote the manuscript, and A.C. provided critical feedback.
Corresponding authors
Ethics declarations
Competing interests
The authors declare no competing interests.
Peer review
Peer review information
Nature Human Behaviour thanks Laura Taylor and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Additional information
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Supplementary information
Supplementary Information
Supplementary Methods and Discussion, Figs. 1 and 2, Tables 1–19, and References.
Rights and permissions
About this article
Cite this article
Bruneau, E., Casas, A., Hameiri, B. et al. Exposure to a media intervention helps promote support for peace in Colombia. Nat Hum Behav 6, 847–857 (2022). https://doi.org/10.1038/s41562-022-01330-w
Received:
Accepted:
Published:
Issue date:
DOI: https://doi.org/10.1038/s41562-022-01330-w
This article is cited by
-
Emotion regulation and attitudes toward FARC-EP ex-combatants and Venezuelan migrants: effects of a reappraisal training
BMC Psychology (2025)
-
Virtual contact improves intergroup relations between non-Muslim American and Muslim students from the Middle East, North Africa and Southeast Asia in a field quasi-experiment
Communications Psychology (2025)
-
Intergroup psychological interventions highlighting commonalities can increase the perceived legitimacy of critical voices
Communications Psychology (2025)
-
Advancing research and practice of psychological intergroup interventions
Nature Reviews Psychology (2024)