Higher cognitive ability linked to weaker moral foundations in UK adults

Existing research on the relationship between cognitive ability and moral foundations has yielded contradictory results. While some studies suggest that higher cognitive ability is associated with more enlightened moral intuitions, others indicate it may weaken moral foundations. To address this ambiguity, we conducted two studies (total N = 1320) using the Moral Foundations Questionnaire-2 (MFQ-2) with UK residents. Both Study 1 and Study 2 (preregistered) revealed negative links between cognitive ability and moral foundations. In Study 1, structural models showed negative links between general intelligence (g) and both binding (−0.24) and individualizing (−0.19) foundations. These findings replicated closely in Study 2, with similar coefficients (−0.25 and − 0.18, respectively). Higher verbal ability was specifically associated with lower purity scores. These findings suggest a negative association between cognitive ability and moral foundations, challenging existing theories relating to intelligence and moral intuitions. However, causal direction remains uncertain. • Tested association of intelligence and moral foundations. • Higher ability linked to lower individualizing and binding. • Lower Proportionality, Loyalty, Authority, and Purity. • Lower Equality and Care. • Verbal ability linked specifically to impurity. • Replicated in pre-registered large study.