Postdoctoral Fellow · University of Pennsylvania

Shira Hebel-Sela

I study how group identity, intergroup conflict, and media environments shape susceptibility to misinformation and conspiracy theories — and how targeting these processes can reduce false beliefs and hostility at scale.

About

I am an incoming postdoctoral fellow at the Annenberg School for Communication at the University of Pennsylvania, where I will work with Prof. Emily Falk and Prof. Yphtach Lelkes as part of the Penn-Kalaniyot Fellowship. I completed my PhD at the Hebrew University of Jerusalem, supervised by Eran Halperin (Hebrew University) and Boaz Hameiri (Tel Aviv University).

My research centers on the role of group processes and media environments in misinformation and conspiracy belief. I study why group identity and intergroup conflict make people more susceptible to false narratives and conspiracy theories — and how media exposure interacts with these group-level dynamics to amplify or attenuate belief in misinformation. Crucially, I am equally invested in the other side of that question: how those same group-level processes can be deliberately targeted to reduce false beliefs and intergroup hostility. I have developed and tested a wide range of interventions — including virtual contact, self-affirmation campaigns, paradoxical thinking, tailored and personalized messaging, and AI-delivered approaches — across large-scale field experiments and intervention tournaments conducted in real conflict contexts.

My research has appeared in journals including Communications Psychology, Political Psychology, Current Opinion in Psychology, and Personality and Social Psychology Bulletin, and is featured in edited volumes published by Routledge. I have been recognized with the Penn-Kalaniyot Postdoctoral Fellowship, the Fulbright Postdoctoral Fellowship (awarded; declined), the Halbert Postdoctoral Fellowship (awarded; declined), and the President's Scholarship for Outstanding PhD Students at the Hebrew University of Jerusalem.

Research

What I Work On

01

Group Identity & Conspiracy Belief

How belonging to a group shapes what people believe: why group membership, in-group loyalty, and us-versus-them thinking make people more susceptible to conspiracy theories and false narratives.

02

Media, Conflict & Misinformation

How media environments and intergroup conflict interact to amplify susceptibility to false narratives — and the conditions under which media exposure reinforces or challenges group-based misinformation.

03

Interventions Against Misinformation & Hostility

A broad program of intervention research targeting the group-level mechanisms that drive false beliefs. I have developed and tested virtual contact, self-affirmation, paradoxical thinking, tailored messaging, and AI-delivered approaches — across field experiments and intervention tournaments in real conflict contexts.

04

AI & Large-Scale Field Experiments

Using machine learning and AI-delivered interventions to build personalized, scalable approaches that can be tested and deployed in real-world conflict contexts.

Publications

Publications

* = equal contribution by the authors

Journal Articles
2026

Hebel-Sela, S., Nir, N., Gruenwald, A., Hameiri, B., & Halperin, E. One size might not fit all: A Tailored Approach to Psychological Intergroup Interventions. Personality and Social Psychology Bulletin.

doi.org/10.1177/01461672261434701
2026

Yair, O., Hebel-Sela, S., Cavari, A., & Efrat, A. Conspiracy Thinking and Political Conspiracy Theories: A Moderating Effect of Political Congruence? Political Psychology.

doi.org/10.1111/pops.70131
2025

Hebel-Sela, S.*, Hamieri, B.*, Tropp, L. R., Moore-Berg, S., Halperin, E., Saxe, R., & Bruneau, E. 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.

doi.org/10.1038/s44271-025-00218-5
2024

Hebel-Sela, S.*, Aldar, L.*, Orian Harel, T.*, Hameiri, B., Pliskin, R., & Halperin, E. Gone Too Far? The Paradoxical Effect of Political Elite Radicalization. Political Psychology.

doi.org/10.1111/pops.13068
2023

Hebel-Sela, S., Stefaniak, A., Vandermeulen, D., Adler, E., Hameiri, B., & Halperin, E. Are societies in conflict more susceptible to believe in conspiracy theories? A 66 Nation Study. Peace and Conflict: Journal of Peace Psychology.

doi.org/10.1037/pac0000645
2022

Hebel-Sela, S., Hameiri, B., & Halperin, E. The vicious cycle of violent intergroup conflicts and conspiracy theories. Current Opinion in Psychology, 47, 101422.

doi.org/10.1016/j.copsyc.2022.101422
2022

Shuman, E., Hebel-Sela, S., Zipris, I., Hasson, Y., Hameiri, B., & Halperin, E. Advancing support for intergroup equality via a self-affirmation campaign. Group Processes & Intergroup Relations.

doi.org/10.1177/13684302221128505
2022

Adler, E.*, Hebel-Sela, S.*, Leshem, O. A., Levy, J., & Halperin, E. A social virus: Intergroup dehumanization and unwillingness to aid amidst COVID-19. International Journal of Intercultural Relations, 86, 109–121.

doi.org/10.1016/j.ijintrel.2021.11.006
In Press

Ushomirsky, I., Hasson, Y., Atia, R., Attias, N., Balmas, M., Endevelt, K., Gur, T., Hameiri, B., Hebel-Sela, S., Leshem, O. A., Malovicki-Yaffe, N., Manekin, D., Perry, A., Porat, R., Saguy, T., Shuman, E., & Halperin, E. Increasing Perceived Outgroup Heterogeneity Following Exposure to Extreme Violence: An Intervention Tournament in Times of War. Personality and Social Psychology Bulletin.

Book Chapters
2025

Hebel-Sela, S., Hameiri, B., & Halperin, E. Personalized psychological intergroup interventions: A three-factor framework. In Petty, R., et al. (Eds.), Personalized Persuasion. Routledge.

2023

Hebel-Sela, S., Knab, N., & Hameiri, B. Paradoxical thinking interventions in intergroup conflicts: A promising method to affect cognitions and behavior among people with extreme attitudes. In E. Halperin, B. Hameiri, & R. Littman (Eds.), Psychological Intergroup Interventions: Evidence-based Approaches to Resolve Intergroup Conflict. Routledge.

Let's Connect

I'm always happy to discuss research, potential collaborations, or questions about my work.

shira.hebel@mail.huji.ac.il
Current
The Hebrew University
of Jerusalem
From September 2026
Annenberg School for Communication
University of Pennsylvania