Moral psychology
Does feeling cold make people's moral choices more utilitarian?
Open access · cc by · source: Europe PMC
Across four experiments, cooler temperatures did not reliably change how acceptable people found sacrificing one person to save many.
Study at a glance
- Design
- Human experiment — Four between-subjects experiments manipulating room temperature (Exps 1, 3, 4) or cooling pads on the body (Exp 2), with manipulation checks of felt warmth, comfort and skin temperature; mixed-effects models plus a Bayesian t test pooling all four
- N
- Separate samples: Exp 1 N = 82, Exp 2 N = 82, Exp 3 N = 48, Exp 4 N = 68 Japanese students
- Population
- Healthy Japanese undergraduate and graduate students
- Outcome
- Rated moral acceptability of sacrificial (utilitarian) actions in controlled moral dilemmas; in Exp 3 also acceptability of real-world moral images
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Key findings
Temperature manipulations worked: people felt colder and less comfortable, and skin temperature changed. Only Experiment 1 found the expected effect of cool rooms increasing acceptance of sacrificial actions; Experiments 2 and 3 found no effect, and Experiment 4 found long cold exposure made judgments less utilitarian, the opposite direction. Pooling the strongest condition from all four experiments, a Bayesian test gave a Bayes factor of 10.74 favouring no effect.
Methodology
Building on an earlier finding that cold makes people more willing to sacrifice one to save many, the researchers ran four experiments with Japanese students rating moral dilemmas. Experiment 1 set the room to 21°C, 24°C or 27°C; Experiment 2 kept the room constant but cooled one or three pads on the forehead, neck and hand; Experiment 3 compared a cool and a control room using dilemmas plus a task rating real-world moral images; Experiment 4 varied how long people spent in the cold (none, 5 minutes or 60 minutes). They checked that people actually felt colder and measured skin temperature.
Limitations
Temperatures stayed within an ethically comfortable range (about 21-27°C), so the study cannot rule out effects of truly cold, stressful conditions. Participants knew the study concerned temperature and answered repeated manipulation checks, which may have made them guarded. Experiment 3 fell short of its planned sample and group sizes were unbalanced in several experiments. The dilemma task captures acceptance of instrumental harm rather than utilitarian concern for the greater good in general.
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