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Publication

A moral trade-off system produces intuitive judgments that are rational and coherent and strike a balance between conflicting moral values

2022 , GUZMÁN PRICE, RICARDO , BARBATO EPPLE, MARÍA TERESA , Daniel Sznycer , Leda Cosmides

How does the mind make moral judgments when the only way to satisfy one moral value is to neglect another? Moral dilemmas posed a recurrent adaptive problem for ancestral hominins, whose cooperative social life created multiple responsibilities to others. For many dilemmas, striking a balance between two conflicting values (a compromise judgment) would have promoted fitness better than neglecting one value to fully satisfy the other (an extreme judgment). We propose that natural selection favored the evolution of a cognitive system designed for making trade-offs between conflicting moral values. Its nonconscious computations respond to dilemmas by constructing “rightness functions”: temporary representations specific to the situation at hand. A rightness function represents, in compact form, an ordering of all the solutions that the mind can conceive of (whether feasible or not) in terms of moral rightness. An optimizing algorithm selects, among the feasible solutions, one with the highest level of rightness. The moral trade-off system hypothesis makes various novel predictions: People make compromise judgments, judgments respond to incentives, judgments respect the axioms of rational choice, and judgments respond coherently to morally relevant variables (such as willingness, fairness, and reciprocity). We successfully tested these predictions using a new trolley-like dilemma. This dilemma has two original features: It admits both extreme and compromise judgments, and it allows incentives—in this case, the human cost of saving lives—to be varied systematically. No other existing model predicts the experimental results, which contradict an influential dual-process model.

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Reply to Greene: No version of the dual process model can explain rational performance by people who made compromise moral judgments

2023 , Leda Cosmides , BARBATO EPPLE, MARÍA TERESA , Daniel Sznycer , Miguel Ángel Labarca , GUZMÁN PRICE, RICARDO

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The Evolution of Moral Cognition

2018 , Leda Cosmides , GUZMÁN PRICE, RICARDO , John Tooby