Abstract
Religions promote cooperation, but they can also be divisive. Is religious cooperation intuitively parochial against atheists? Evidence supporting the social heuristics hypothesis (SHH) suggests that cooperation is intuitive, independent of religious group identity. We tested this prediction in a one-shot prisoner’s dilemma game, where 1,280 practising Christian believers were paired with either a coreligionist or an atheist and where time limits were used to increase reliance on either intuitive or deliberated decisions. We explored another dual-process account of cooperation, the self-control account (SCA), which suggests that visceral reactions tend to be selfish and that cooperation requires deliberation. We found evidence for religious parochialism but no support for SHH’s prediction of intuitive cooperation. Consistent with SCA but requiring confirmation in future studies, exploratory analyses showed that religious parochialism involves decision conflict and concern for strong reciprocity and that deliberation promotes cooperation independent of religious group identity.
Protocol registration
The Stage 1 protocol for this Registered Report was accepted in principle on 28 January 2020. The protocol, as accepted by the journal, can be found at https://doi.org/10.6084/m9.figshare.12086781.v1.
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Data availability
The data are available at the OSF study preregistration page (https://osf.io/kzwgn/).
Code availability
The analysis code is available at the OSF study preregistration page (https://osf.io/kzwgn/).
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Acknowledgements
The authors received no specific funding for this work. The authors thank S. Gächter for comments on the manuscript and D. Lakens for feedback on equivalence testing. All errors are our own.
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O.I. and O.Y. conceived the initial idea and design, which was improved with contributions by A.J.M. O.I. wrote the manuscript, which was revised by all three authors. O.I. collected and analysed the data. All authors had access to the data and approved the final version.
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Isler, O., Yilmaz, O. & John Maule, A. Religion, parochialism and intuitive cooperation. Nat Hum Behav 5, 512–521 (2021). https://doi.org/10.1038/s41562-020-01014-3
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DOI: https://doi.org/10.1038/s41562-020-01014-3
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