Journal articles

Claessens, S., Kyritsis, T., & Atkinson, Q. D. (2023). Cross-national analyses require additional controls to account for the non-independence of nations. Nature Communications, 14(1), 5776. paper, data and code

Heiman, S. L., Claessens, S., Ayers, J. D., Guevara Beltrán, D., Van Horn, A., Hirt, E. R., … & Todd, P. M. (2023). Descriptive norms caused increases in mask wearing during the COVID-19 pandemic. Scientific Reports, 13(1), 11856. paper, data and code

Atkinson, Q. D., Claessens, S., Fischer, K., Forsyth, G. L., Kyritsis, T., Wiebels, K., & Moreau, D. (2023). Being specific about generalisability. Religion, Brain & Behavior. 13(3), 284-286. paper

Hoogeveen, S. et al. (2023). A many-analysts approach to the relation between religiosity and well-being. Religion, Brain & Behavior. 13(3), 237-283. paper, data and code

Claessens, S., Sibley, C. G., Chaudhuri, A., & Atkinson, Q. D. (2023). Cooperative and conformist behavioural preferences predict the dual dimensions of political ideology. Scientific Reports, 13(1), 4886. paper, code

Sheehan, O., Watts, J., Gray, R. D., Bulbulia, J., Claessens, S., Ringen, E. J., & Atkinson, Q. D. (2023). Coevolution of religious and political authority in Austronesian societies. Nature Human Behaviour, 7(1), 38-45. paper, data and code

Claessens, S., Kelly, D., Sibley, C. G., Chaudhuri, A., & Atkinson, Q. D. (2022). Cooperative phenotype predicts climate change belief and pro-environmental behaviour. Scientific Reports, 12(1), 12730. paper, code

Claessens, S., & Kyritsis, T. (2022). Partner choice does not predict prosociality across countries. Evolutionary Human Sciences, 4, e54. paper, data and code

Krems, J. A., Claessens, S., Fales, M. R., Campenni, M., Haselton, M. G., & Aktipis, A. (2021). An agent-based model of the female rivalry hypothesis for concealed ovulation in humans. Nature Human Behaviour, 5(6), 726-735. paper, data and code

Claessens, S., Ayers, J. D., Cronk, L., & Aktipis, A. (2021). Need-based transfer systems are more vulnerable to cheating when resources are hidden. Evolution and Human Behavior, 42(2), 104-112. paper, data and code

Claessens, S., Kyritsis, T., & Atkinson, Q. D. (2020). Revised analysis shows relational mobility predicts sacrificial behavior in Footbridge but not Switch or Loop trolley problems. Proceedings of the National Academy of Sciences, 117(24), 13203-13204. paper, data and code

Claessens, S., Fischer, K., Chaudhuri, A., Sibley, C. G., & Atkinson, Q. D. (2020). The dual evolutionary foundations of political ideology. Nature Human Behaviour, 4(4), 336–345. paper

Neilands, P., Claessens, S., Ren, I., Hassall, R., Bastos, A. P., & Taylor, A. H. (2020). Contagious yawning is not a signal of empathy: no evidence of familiarity, gender or prosociality biases in dogs. Proceedings of the Royal Society B, 287(1920), 20192236. paper, data and code

Book chapters

Claessens, S., Chaudhuri, A., Sibley, C. G. & Atkinson, Q. D. (2022). The evolutionary basis of political ideology. In C. G. Sibley & D. Osbourne (Eds.), The Cambridge Handbook of Political Psychology. Cambridge, UK: Cambridge University Press. chapter


Claessens, S., Atkinson, Q., & Raihani, N. (2024). Why do people punish? Evidence for a range of strategic concerns. pre-print, data and code

Claessens, S., Sibley, C. G., Chaudhuri, A., & Atkinson, Q. D. (2023). Cooperative phenotype predicts political ideology eighteen months later. pre-print, code

Bastos, A. P., Claessens, S., Nelson, X. J., Welch, D., Atkinson, Q. D., & Taylor, A. H. (2023). Crowdsourcing and phylogenetic modelling reveal parrot tool use is not rare. pre-print, data and code

Ayers, J. D., Guevara Beltran, D., Alcock, J., Baciu, C., Claessens, S., Cronk, L., … Aktipis, A. (2020). How is the COVID-19 pandemic affecting cooperation? pre-print