Main research questions Research projects Preprints Data and supplementary materials
Main research questions
Why do humans cooperate?
Reputation-based mechanisms are fundamental drivers of cooperation: Takács (2022), Számadó et al. (2021), Samu et al. (2020)
Gossip is the informal channel that shapes reputations and increases cooperation: EVILTONGUE project (ERC Consolidator Grant), Giardini et al. (2022), Samu & Takács (2021)
Gossip is powerful because it is also about the perspectives and tolerance of others: Righi & Takács (2022)
“Leading eight” social norms (metanorms) establish cooperation also if information and updates are local: Podder et al. (2021), or the context is transient: Sziget project
Indirect reciprocity best operates with transitive network closure: Righi & Takács (2018), Bravo et al. (2015), and with balanced triads: Righi & Takács (2014)
Altruism can propagate in a fixed spatial structure: Németh & Takács (2007)
Local social control creates efficient incentives to cooperate: Takács et al. (2008), Janky & Takács (2010), Takács & Janky (2007)
Voluntary punishment increases cooperation both if play is compulsory or optional: Pancotto et al. (2023)
What are the guarantees and consequences of honest signals and communication?
The problem of honesty is prevalent from microbes to humans: Workshop at Lorentz center, Theme issue of the Philosophical Transactions of the Royal Society B
It is not the costs of signals, but the condition-dependent trade-offs between costs and benefits that matters: Számadó et al. (2022), Signaling games project
Social networks affect the accuracy of reputations and the honesty of shared information: Takács et al. (2021)
Hypocrisy can be prevalent and delays opinion convergence: Gastner et al. (2019)
Why do ethnic inequalities persist in school?
Friendship ties are not integrated: Wired into Each Other project, Vörös et al. (2024), Kisfalusi et al. (2019)
Friends adjust academic ambitions to each other: Vit et al. (2024)
Deskmates matter for performance and prejudice: Keller & Takács (2019), Radó & Takács (2019)
Double standards about ability are maintained through social network ties: Grow et al (2016), Kisfalusi et al. (2019)
Health inequalities exist due to social network mechanisms: E-cigarettes network spread project (FORTE), Radó et al. (2024)
Teachers’ grading is biased: Kisfalusi et al. (2021), Discrimination project (OTKA), Discrimination project (VR),
Discrimination experience translates to differential effort: Registered pre-analysis plan
How do social network mechanisms stabilize groups?
Positive as well as negative ties; and structural balance shape informal group boundaries: Competition and Negative Ties project (Lendület), Stadtfeld et al. (2020), Estévez et al. (2022)
Brokers connecting groups have several benefits, but they are also the targets of negative gossip: Estévez & Takács (2022)
Demographically crisscrossing actors help prevent polarization: Mäs et al. (2013)
Segregated social ties increase intergroup conflict: Takács (2002) PhD dissertation, Takács (2007), Takács (2005), Takács (2001)
How do local social network mechanisms contribute to societal problems and collapse?
Multiplex local network exposure contributes to societal outcomes such as inequality and segregation: NetReg project
Local network clustering affects a cascade that leads to a collapse of an Online Social Network: Lőrincz et al. (2019), Koltai et al. (2025) or to leave an organization: Kratzer & Takács (2007)
Referrals and information flow in networks increase discrimination: Takács et al. (2018), Takács et al. (2014)
Research projects
NetReg project: “The complete network of Sweden: Characteristics, dynamics and consequences of social exposure across multiple social domains“, Vetenskapsrådet (VR), 2024-01861, Research Environment Grant within Humanities and social sciences, PI (2025-2030), Project website
Collaborators: Carl Nordlund, Martin Arvidsson, Maria Brandén, Selcan Mutgan, Laura Fürsich, Elis Carlsberg Larsson, Maël Lecoursonnais, Christian Steglich, Petter Holme, Neha Gondal.
Abstract: We know a lot about how social contacts within various social contexts — households, schools, workplaces, neighborhoods — influence individuals’ health, demographic and socioeconomic outcomes. We know rather little about how these different social contexts are interlinked, and thus we lack a good understanding about the true interconnectedness of society and its consequences. In order to fill this gap, our research utilizes the Swedish population register data for creating large-scale, population-wide networks that integrate multiple social contexts (i.e. multiplex networks). We study their properties, how they evolve, and the consequences they have for various social outcomes. Methodologically, we develop novel approaches for constructing, measuring, and analyzing full-population networks. Substantively, we provide novel insights into how interwoven and segregated societies are, how influence flows between domains to affect individuals’ outcomes, and how individuals’ networks develop from adolescence into adulthood.
“Peer influence or discrimination? Understanding the mechanisms behind ethnic differences in school achievement”, Vetenskapsrådet (VR), Focus Grant on Racism and Discrimination, PI (2024-2026), Project website
Collaborators: Dorottya Kisfalusi, Eszter Vit, Erik Rosenqvist, Maria Brandén, Selcan Mutgan, Christian Steglich, Márta Radó.
Abstract: Equal chances for educational attainment are important for immigrant integration. In many Western countries, however, a considerable ethnic gap is observed in students’ school achievement. Although Sweden is one of the most egalitarian countries, still considerable inequalities are observed in school achievements. Whereas children of some immigrant groups perform similarly well in the school as ethnic majority children, other immigrant-background youth lag behind with regard to their test scores and school grades, even after controlling for their socio-economic status and language skills. In this project, we concentrate on three potential explanations that could contribute to ethnic differences in school performance after controlling for students’ abilities: discrimination in teachers’ grading practices, network mechanisms that differentiate academic achievement, and the emergence of oppositional culture. Our aim is to assess the contributions of these explanations to ethnic differences in academic achievement.
EVILTONGUE: “No Sword Bites So Fiercly as an Evil Tongue? Gossip Wrecks Reputation, but Enhances Cooperation”, European Research Council (ERC) Consolidator Grant 2014, ERC CoG 648693, PI (2015-2021). Project report Project website
Collaborators: Flóra Samu, Júlia Galántai, Dorottya Kisfalusi, Eszter Vit, Simone Righi, José Luis Estévez, Robert Krause, Márta Radó, Srebrenka Letina, Boróka Pápay, Bálint Kubik, Szabolcs Számadó, Zsuzsanna Szvetelszky, Eliza Bodor-Eranus, Martina Katalin Szabó, Attila Gulyás, Ákos Bocskor, Laura Boldvai-Pethes, Zea Szebeni, Gábor Tóth, Kármen Czett, Matthew Maynard, Liyu Pan, and more
Abstract: According to common wisdom, gossip channels mainly negative and often fictitious information. If it is the case: how can dishonest gossip and the resulting biased reputations legitimize social order and promote cooperation? This is the main puzzle we tackle in this project exploiting a wide set of instruments. We use analytical modeling and agent-based simulation to derive hypotheses. We test simple hypotheses in small group experiments. We develop new methodological tools to appropriately analyze the triadic nature of gossip embedded in network flows of information. We utilize dynamic network datasets from primary and secondary school classes, and we gather qualitative and quantitative information from organizations to test conditional hypotheses about the role that gossip plays in reputation and cooperation in different developmental and social contexts of life. In addition, we apply new communication technologies currently under development to explore the hidden world of gossip and the dynamics of reputation in dormitories and organizations. With the insights gained, we can overcome common stereotypes about gossip and highlight how gossip is related to credible reputational signals, cooperation, and social order. Expected results will help us to outline the conditions that can promote cooperation in work groups, and they will help to construct successful prevention strategies for social exclusion and for other potentially harmful consequences of the evil tongue.
“Competition and Negative Networks. The Origin, Dynamics, and Harmful Consequences of Negative Relations”, Lendület (Momentum) grant of the Hungarian Academy of Sciences, PI (2012-2017), Project website
Collaborators: Simone Righi, Judit Pál, Bálint Néray, Zsófia Boda, András Vörös, Dorottya Kisfalusi, Eszter Vit, Eszter Mandácskó, Barbara Panyik, Flóra Samu, László Kiss, Attila Gulyás, Ákos Bocskor, Laura Boldvai-Pethes, Anikó Havelda, Pálma Mogyorósi, Tamás Keller, Eliza Bodor-Eranus, Márta Radó, Boróka Pápay, Gergő Havadi, Orsolya Ring, Jeromos Vukov, Milan Bojanowski, and more
Abstract: Negative ties, such as hate, or relational aggression contribute to serious problems in a variety of social contexts. They ruin cooperation, decrease performance, induce intergroup conflict, and hamper cohesion. It is therefore surprising that in the boosting literature on networks, ties have been thought mainly in positive terms. The research aims to correct this asymmetry and attempts to discover the true nature and mechanisms of negative relations. In the research program, we aimed to discover the true nature and mechanisms of negative relations and networks in different social contexts, to develop theories that explain their interrelated dynamics with competition, and to assess the impact of negative ties on performance, cooperation, cohesion, and ethnic integration.
“Tackling the spread of cigarettes and alternative nicotine products in social networks“, FORTE 2023-00678, PI: Márta Radó (2024-2026), Project website
Collaborators: Márta Radó, Tangbin Chen, Paul Lichtenstein, Dorottya Kisfalusi, Olivia Bannon Karlsson
Abstract: The increasing use of social media and alternative nicotine products, i.e., e-cigarettes and Swedish snus, poses new threats to stall the progress of tobacco control. Vast research shows how smoking spreads in social networks, but it remains unclear how alternative nicotine products and online interactions affect this spread. Understanding the social network mechanisms underlying nicotine product use is crucial for the design of effective policies. Novel policies for adolescents are needed to prevent nicotine product use at the age when this is typically initiated, even by those who would otherwise never use cigarettes. The project identifies the network mechanisms of how various nicotine products spread among adolescents. We examine (1) how different nicotine products spread and if alternative nicotine products renormalize cigarettes, (2) how cigarette use spreads online and offline, and (3) what the possible consequences of network-based interventions are, accounting for various nicotine products and online interactions.
“The hidden power of volunteers’ social networks: A comparative dynamic social network research among festival volunteers” (Sziget research), NKFIH-OTKA 143024, PI: Eliza Bodor-Eranus (2022-2024), Project summary
Collaborators: Eliza Bodor-Eranus, Béla Janky, Eszter Vit, Zsuzsanna Szvetelszky, Beáta Lázár, Ákos Bocskor
Abstract: While social norms and metanorms supporting sanctions play a crucial role in norm compliance, little is known about their emergence in temporary settings lacking long-term interactions and reputation systems. In this project, we analyze the motivations and nature of volunteering at three Hungarian music festivals using survey, social network, and interview data. We investigate how norm violations are handled informally and what kind of informal institutions emerge to supplement formal ways of sanctions.
“Discrimination in teacher assessments or network effects? Understanding the mechanisms behind ethnic and gender differences in school achievement”, NKFIH-OTKA 137765, PI: Dorottya Kisfalusi (2021-2024), Project summary
Collaborators: Dorottya Kisfalusi, Eszter Vit, Flóra Samu
Abstract: In Hungary and many other countries, a considerable ethnic and gender gap is observed in school achievement. Standardized blind tests show that whereas children of some ethnic minority groups perform similarly well in the school as ethnic majority children, other minority youth lag behind considerably. Even after controlling for standardized blind test scores, studies spanning various countries found evidence for ethnic differences in non-blind teacher assessments. Gender differences are less pronounced in standardized tests, but conditional on blind test scores, girls were found to receive better non-blind assessments than boys.
In this project, we concentrate on two potential explanations that might contribute to the ethnic and gender differences in students’ school grades conditional on standardized blind test scores: discrimination in teacher assessments and network mechanisms influencing students’ academic achievement. Our project brings together these two research lines and disentangles the underlying mechanisms behind differences in academic achievement. Analysing existing observational data of two large-scale panel datasets collected among minority and majority adolescents in Hungary and in four other European countries as well as conducting new experiments and a survey among both students and teachers in Hungary, we concentrate on the following two research goals: 1. We investigate whether certain groups of students are discriminated against in teacher evaluations and identify the potential underlying mechanisms; 2. We identify how social interactions between students contribute to ethnic and gender differences in school achievement through network mechanisms.
“Signalling games: honesty and reputation”, NKFIH-OTKA 132250, PI: Szabolcs Számadó (2019-2023), Project report
Collaborators: Szabolcs Számadó, Flóra Samu, István Zachar
Abstract: Honesty of communication is maintained by differential marginal cost and differential marginal benefits. On the one hand, the potential benefit of signalling has to be larger for honest signallers than the potential cost. On the other hand, the potential cost of signalling has to be larger for potential cheaters than the potential benefits. This statement can be translated to the following claim: communication will be honest if the marginal cost of being treated as a dishonest signaller is higher than the marginal benefits achieved by dishonest communication. Does this relationship hold in natural contexts? What are the potential costs and benefits of communication in human interactions? We investigate these questions by analytical, individual-based models, laboratory experiments and literature reviews.
“Wired into Each Other” (RECENS), NKFIH-OTKA K81336 (2010-2013), Project website
Collaborators: Tamás Bartus, Judit Pál, Bálint Néray, Zsófia Boda, András Vörös, Dorottya Kisfalusi, Eszter Vit, Eszter Mandácskó, Barbara Panyik, Flóra Samu, Lilla Dorina Habsz, Zoltán Csaba, László Lőrincz, Kinga Varga, Gabriella Mezei, Laura Boldvai-Pethes, Anikó Havelda, Pálma Mogyorósi, Márta Radó, and more
Abstract: School segregation has been demonstrated by decades of research and practical experience as harmful for the disadvantaged minority as it contributes to lower performance, to lower chances of entering highest education, and consequently to increasing inequality. Even in integrated schools, friendships ties are typically highly segregated, thus integrated education does not necessarily mean integration at the level of primordial social order. Segregation of friendships may have serious implications for the effectiveness of social programs aiming to mix students of different social or ethnic backgrounds within classes. Segregation of friendships might imply the emergence of subcultures that oppose the objectives of schools and the educational system. If friendship ties remain segregated in integrated classrooms, disadvantaged pupils will not be influenced by mainstream role models, and integrated education may reduce differences in scholastic performance between non-Roma and Roma pupils to a lesser extent than expected by experts and policymakers. The research project proposed here aims to describe and explain segregation of friendships within school classrooms. The basic postulates of our research agenda are that the problem of ethnic integration should be looked at the level of voluntary formation of friendship, negative and romantic ties; and that the problem of ethnic integration in the classroom cannot be looked at without analyzing the interrelated dynamics of social networks, status, and performance. Status competition typically intensifies the segregation of friendship ties and might also lead to the social exclusion of disadvantaged pupils, or alternatively, as another problem, to the social exclusion of the best performing students.
The “Research Center for Educational and Network Studies (RECENS) Wired into each other” longitudinal social network study conducted in 44 secondary-school classrooms in Hungary between 2010 and 2013. Participants were asked to fill out paper-based surveys four times over a 3-year period (n = 1,767 students). These surveys explored peer relations and perceptions within each classroom in over 30 distinct network dimensions, including shared social activities, ties of affection, bullying and victimization, perceptions about peers’ traits (including their ethnicity), behaviors, social roles, and status. Alongside the network data, we collected information about students’ individual background (e.g., sex, ethnicity, socioeconomic status) and behaviors (e.g., smoking, studying habits). We further interviewed the main teacher of each classroom to gather data about teaching arrangements and teacher perceptions of students.
Preprints
of not yet published work
Data and supplementary materials
Kisfalusi, D., Radó, M.K., Habsz, L., & Takács, K. (2024). Are High-Performing Ethnic Roma Students Excluded from Their Minority Peer Group? Friendship Relations, Ethnic Identification, and Labeling. [data and do files], Open Science Framework.
Vörös, A., Boda, Z., Néray, B., Pál, J., Kisfalusi, D., Samu, F., Vit, E., Radó, M., Habsz, L., Csaba, Z., Lőrincz, L., Mandácskó, E., Panyik, B., Varga, K., Mezei, G., Makovi, K., Boldvai-Pethes, L., Havelda, A., Bartus, T., & Takács, K. (2022). Wired into Each Other: Network Dynamics of Adolescents in Hungarian Secondary Schools: 2010-2013. [data collection]. UK Data Service. SN: 855460.
Kisfalusi, D., Janky B. & Takács K. (2021): Grading in Hungarian Primary Schools: Mechanisms of Ethnic Discrimination against Roma Students. European Sociological Review, Open Science Framework.
Righi, S., & Takács, K. (2018). Social Closure and the Evolution of Cooperation via Indirect Reciprocity. (Version 1.1.0). CoMSES Computational Model Library.
Takács, K. (2016). The Discount of Evolution in Sociology. Background data DOI: 10.17203/KDK376




