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Faculty of Human SciencesSocial Cognition Center Cologne

Chair Lammers Group | Political Psychology

Prof. Dr. Joris Lammers

Phone +49-221-470-6126
Fax +49-221-470-76018

E-mail joris.lammersSpamProtectionuni-koeln.de
Address Richard-Strauss-Str. 2, 50931 Köln | Germany

Room 4.B.01
Office hours by appointment

Research interests | Key publications | All publications | Academic distinctions

Research interests

Social power • Moral psychology • Sexism and gender • Political psychology • Existential psychology

Key Publications

  • Fleischmann, A., Lammers, J., Diel, K., Hofmann, W., & Galinsky, A. D. (2021). More threatening and more diagnostic: How moral comparisons differ from social comparisons. Journal of Personality and Social Psychology.  Advance online publication. https://doi.org/10.1037/pspi0000361

  • Lammers, J., Crusius, J., & Gast, A. (2020). Correcting misperceptions of exponential coronavirus growth increases support for social distancing. Proceedings of the National Academy of Sciences, 117(28), 16264 - 16266. https://doi.org/10.1073/pnas.2006048117 [data on OSF]

  • Lammers, J., & Baldwin, M. (2018). Past-focused temporal communication overcomes conservatives' resistance to liberal political ideas. Journal of Personality and Social Psychology, 114, 599-619. https://doi.org/10.1037/pspi0000121  [data on OSF]

  • Baldwin, M., & Lammers, J. (2016). Past-focused environmental comparisons promote proenvironmental outcomes for conservatives. Proceedings of the National Academy of Sciences, 113, 14953–14957. https://doi.org/10.1073/pnas.1610834113

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All Publications

  • García Ferrés, E., Van Berkel, L., Baldwin, M., & Lammers, J. (2024). Temporal comparisons shape system justification processes. Political Psychology.

  • Schulte, A., Baldwin, M., & Lammers, J. (2024). Highlighting the old in the'new normal': Appealing to conservatives’ focus on the past decreases opposition to COVID-19 measures. Social Psychology, 55(2). http://dx.doi.org/10.1027/1864-9335/a000544 

  • Liu, Z., Luan, M., Li, H., Stoker, J.I., & Lammers, J. (2024). Psychological power increases the desire for social distance but reduces the sense of social distance. Journal of Experimental Social Psychology, 110, 104528. https://doi.org/10.1016/j.jesp.2023.104528.

  • Lammers, J., Schulte, A., & Baldwin, M. (2023). Does framing climate change policies to fit with epistemic needs for predictability reduce conservatives’ opposition? Analyses of Social Issues and Public Policy. https://doi.org/10.1111/asap.12362.

  • Lammers, J., & Uğurlar, P. (2023). Political-Ideological Differences in Cultural Pessimism and Nostalgia Reflect People’s Evaluation of Their Nation’s Historical Developments. Social Psychological and Personality Science. https://doi.org/10.1177/19485506231173735.

  • Feenstra, S., Stoker, J.I., Lammers, J., & Garretsen, H. (2023). Managerial stereotypes over time: The rise of feminine leadership. Gender in Management: an International Journal, 38, 770-783. https://doi.org/10.1108/GM-10-2022-0331.

  • Unkelbach, C., Alves, H., Baldwin, M., Crusius, J., Diel, K., Galinsky, A.D., Gast, A., Hofmann, W., Imhoff, R., Genschow, O., Lammers, J., Pauels, E., Schneider, I., Topolinski, S., Westfal, M., & Mussweiler, T. (2023) Relativity in social cognition: Basic processes and novel applications of social comparisons, European Review of Social Psychology, 34(2), 387-440. https://doi.org/10.1080/10463283.2022.2161043. 

  • Bago, B., Aczel, B., Kekecs, Z., Protzko, J., Kovacs, M., Nagy, T., … Lammers, J., … & Gjoneska, B. (2022). Moral thinking across the world: Exploring the influence of personal force and intention in moral dilemma judgments. Nature Human Behavior, 6, 880–895 (2022). https://doi.org/10.1038/s41562-022-01319-5.

  • Lammers, J., Bukowski, M., Potoczek, A., Fleischmann, A., & Hofmann, W. (2022). Disentangling the factors behind shifting voting intentions: The bandwagon effect reflects heuristic processing, while the underdog effect reflects fairness concerns. Journal of Social and Political Psychology, 10, 676–692, https://doi.org/10.5964/jspp.9241.

  • Stoker, J.I., Garretsen, H., & Lammers, J. (2022). Leading and working from home in times of COVID-19: On the perceived changes in leadership behaviors. Journal of Leadership and Organizational Studies, 29(2), 208-218. https://doi.org/10.1177/15480518211007452.

  • Mousavi, D., Schulte, A., & Lammers, J. (2022). Stressing the advantages of female leadership can place women at a disadvantage: A replication and extension of Lammers and Gast (2017). Social Psychology, 53(4), 257–262. https://doi.org/10.1027/1864-9335/a000491

  • Ecker, Y., Imhoff, R., & Lammers, J. (2021). Self-control failure increases a strategic preference for submission as means to avoid future failure. Journal of Experimental Social Psychology, 95, 104155. https://doi.org/10.1016/j.jesp.2021.104155. 

  • Lammers, J., & Imhoff, R. (2021). A chronic lack of perceived low personal control increases women and men’s self-reported preference for high-status characteristics when selecting romantic partners in simulated dating situations. Social Psychological and Personality Science, 12(7), 1345-1357. https://doi.org/10.1177/19485506211016309.

  • Fleischmann, A., Lammers, J., Diel, K., Hofmann, W., & Galinsky, A. D. (2021). More threatening and more diagnostic: How moral comparisons differ from social comparisons. Journal of Personality and Social Psychology. Advance online publication. https://doi.org/10.1037/pspi0000361

  • Lammers, J., Pauels, E., Fleischman, A., & Galinsky, A. D. (2021). Why people hate congress but love their own congressperson: An information processing explanation. Personality and Social Psychology Bulletin.

  • Lammers, J., & Baldwin, M. (2021). Two sides of the same coin: A new look at differences and similarities across political ideology. Cambridge handbook of political psychology.

  • Brandt, M. J., Kuppens, T., Spears, R., Andrighetto, L., Autin, F., Babincak, P., ... Lammers, J., …, Zimmerman, J. L. (2021). Subjective status and perceived legitimacy across countries. European Journal of Social Psychology. https://doi.org/10.1002/ejsp.2694

  • Lammers, J., & Baldwin, M. (2021). Make America gracious again: Collective nostalgia can increase and decrease support for right-wing populist rhetoric. European Journal of Social Psychology. https://doi.org/10.1002/ejsp.2673

  • Fleischmann, A., Lammers, J., Conway, P., & Galinsky, A.D. (2020). Kant be compared: People high in social comparison orientation make fewer—not more—deontological decisions in sacrificial dilemmas. Social Psychological and Personality Science. https://doi.org/10.1177/1948550620947294

  • Lammers, J., Crusius, J., & Gast, A. (2020). Correcting misperceptions of exponential coronavirus growth increases support for social distancing. Proceedings of the National Academy of Sciences, 202006048. https://doi.org/10.1073/pnas.2006048117 [data on OSF]

  • Lammers, J., & Baldwin, M. (2018). Past-focused temporal communication overcomes conservatives' resistance to liberal political ideas. Journal of Personality and Social Psychology, 114, 599-619. https://doi.org/10.1037/pspi0000121  [data on OSF]

  • Lammers, J., Gast, A., Unkelbach, C., & Galinsky, A. D. (2018). Moral character impression formation depends on the valence homogeneity of the context. Social Psychological and Personality Science, 9, 576-585. https://doi.org/10.1177/1948550617714585  [data on OSF]

  • Guinote, A., & Lammers, J. (2017). Accentuation of tending and befriending among the powerless. In M. Bukowski, I. Fritsche, A. Guinote, & M. Kofta (Eds.), Coping with lack of control in a social world (pp. 185–202). New York, NY: Routledge.

  • Lammers, J., Dubois, D., Rucker, D. D., & Galinsky, A. D. (2017). Ease of retrieval moderates the effects of power: Implications for the replicability of power recall effects. Social Cognition, 35, 1–17. https://doi.org/10.1521/soco.2017.35.1.1  [data on OSF]

  • Lammers, J., Koch, A., Conway, P., & Brandt, M. J. (2017). The political domain appears simpler to the politically extreme than to political moderates. Social Psychological and Personality Science, 8, 612-622. https://doi.org/10.1177/1948550616678456  [data on OSF]

  • Leach, S., Weick, M., & Lammers, J. (2017). Does influence beget autonomy? Clarifying the relationship between social and personal power. Journal of Theoretical Social Psychology, 1, 5–14. https://doi.org/10.1002/jts5.5

  • Meijs, M. H. J., Ratliff, K. A., & Lammers, J. (2017). The discrepancy between how women see themselves and feminists predicts identification with feminism. Sex Roles, 77, 293–308. https://doi.org/10.1007/s11199-016-0733-8

  • Baldwin, M., & Lammers, J. (2016). Past-focused environmental comparisons promote proenvironmental outcomes for conservatives. Proceedings of the National Academy of Sciences, 113, 14953–14957. https://doi.org/10.1073/pnas.1610834113

  • Lammers, J., & Imhoff, R. (2016). Power and sadomasochism: Understanding the antecedents of a knotty relationship. Social Psychological and Personality Science, 7, 142–148. https://doi.org/10.1177/1948550615604452

  • Lammers, J., Stoker, J. I., Rink, F., & Galinsky, A. D. (2016). To have control over or to be free from others? The desire for power reflects a need for autonomy. Personality and Social Psychology Bulletin, 42, 498–512. https://doi.org/10.1177/0146167216634064  [data on OSF]

  • De Waal-Andrews, W., Gregg, A. P., & Lammers, J. (2015). When status is grabbed and when status is granted: Getting ahead in dominance and prestige hierarchies. British Journal of Social Psychology, 54, 445–464. https://doi.org/10.1111/bjso.12093

  • Inbar, Y., & Lammers, J. (2015). Increasing ideological tolerance in social psychology [Peer commentary on “Political diversity will improve social psychological science” by J. L. Duarte et al.]. Behavioral and Brain Sciences, 38, e147. https://doi.org/10.1017/S0140525X1400123X

  • Inbar, Y., & Lammers, J. (2014). Political diversity in social psychology: Problems and solutions. In P. Valdesolo & J. Graham (Eds.), Bridging ideological divides, Claremont symposium on applied social psychology.

  • Lammers, J., & Van Beest, I. (2014). The effects of power on immorality. In J.-W. Van Prooijen & P. A. M. Van Lange (Eds.), Power, politics, and paranoia: Why people are suspicious of their leaders (pp. 17–32). Cambridge, UK: Cambridge University Press.

  • Çelik, P., Lammers, J., van Beest, I., Bekker, M. H. J., & Vonk, R. (2013). Not all rejections are alike: Competence and warmth as a fundamental distinction in social rejection. Journal of Experimental Social Psychology, 49, 635–642. https://doi.org/10.1016/j.jesp.2013.02.010

  • Çelik, P., van Beest, I., Lammers, J., & Bekker, M. (2013). Implicit threat vigilance among violent offenders diagnosed with antisocial personality disorder: The impact of ostracism and control threat. International Journal of Developmental Science, 7, 47–55.

  • Lammers, J., Dubois, D., Rucker, D. D., & Galinsky, A. D. (2013). Power gets the job: Priming power improves interview outcomes. Journal of Experimental Social Psychology, 49, 776–779. https://doi.org/10.1016/j.jesp.2013.02.008

  • Latu, I. M., Mast, M. S., Lammers, J., & Bombari, D. (2013). Successful female leaders empower women’s behavior in leadership tasks. Journal of Experimental Social Psychology, 49, 444–448. https://doi.org/10.1016/j.jesp.2013.01.003

  • Lammers, J., Galinsky, A. D., Gordijn, E. H., & Otten, S. (2012). Power increases social distance. Social Psychological and Personality Science, 3, 282–290. https://doi.org/10.1177/1948550611418679

  • Stoker, J. I., Van der Velde, M., & Lammers, J. (2012). Factors relating to managerial stereotypes: The role of gender of the employee and the manager and management gender ratio. Journal of Business and Psychology, 27, 31–42. https://doi.org/10.1007/s10869-011-9210-0

  • Galinsky, A. D., Rus, D., & Lammers, J. (2011). Power: A central force governing psychological, social, and organizational life. In D. De Cremer, R. van Dick, & J. K. Murnighan (Eds.), Social psychology and organizations (pp. 17–38). New York, NY: Routledge/Taylor & Francis Group.

  • Lammers, J., & Gast, A. (2011). Power in the House. In T. V. Cascio & L. M. Martin (Eds.), House and psychology: Humanity is overrated. Hoboken, NJ: Wiley.

  • Lammers, J., Stoker, J. I., Jordan, J., Pollmann, M., & Stapel, D. A. (2011). Power increases infidelity among men and women. Psychological Science, 22, 1191–1197. https://doi.org/10.1177/0956797611416252

  • Lammers, J., Stapel, D. A., & Galinsky, A. D. (2010). Power increases hypocrisy: Moralizing in reasoning, immorality in behavior. Psychological Science, 21, 737–744. https://doi.org/10.1177/0956797610368810

  • Lammers, J., Stoker, J. I., & Stapel, D. A. (2010). Power and behavioral approach orientation in existing power relations and the mediating effect of income. European Journal of Social Psychology, 40, 543–551. https://doi.org/10.1002/ejsp.702

  • Lammers, J., & Galinsky, A. D. (2009). The conceptualization of power and the nature of interdependency: The role of legitimacy and culture. In D. Tjosvold & B. Wisse (Eds.), Power and interdependence in organizations (pp. 67–82). Cambridge, UK: Cambridge University Press.

  • Lammers, J., Gordijn, E. H., & Otten, S. (2009). Iron ladies, men of steel: The effects of gender stereotyping on the perception of male and female candidates are moderated by prototypicality. European Journal of Social Psychology, 39, 186–195. https://doi.org/10.1002/ejsp.505

  • Lammers, J., & Stapel, D. A. (2009). How power influences moral thinking. Journal of Personality and Social Psychology, 97, 279–289. https://doi.org/10.1037/a0015437

  • Lammers, J., Stoker, J. I., & Stapel, D. A. (2009). Differentiating social and personal power: Opposite effects on stereotyping, but parallel effects on behavioral approach tendencies. Psychological Science, 20, 1543–1549. https://doi.org/10.1111/j.1467-9280.2009.02479.x

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Academic distinctions

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