Jean Decety

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Jean Decety is a prominent American–French neuroscientist who studies how the brain supports social thinking, feelings, and behavior. He focuses on developmental, affective, and social neuroscience to understand social decision-making, empathy, moral reasoning, altruism, and how people relate to one another. He is Irving B. Harris Distinguished Service Professor at the University of Chicago and directs the Social Cognitive Neuroscience Laboratory and the Child NeuroSuite. One of his noted students is Sarah-Jayne Blakemore.

Education and career
Decety earned three advanced master’s degrees—neuroscience (1985), cognitive psychology (1986), and biomedical engineering science (1987)—and a Ph.D. in neurobiology/medicine (1989) from Université Claude Bernard in Lyon, France. He did postdoctoral work in Lund, Sweden, and at Karolinska Hospital in Stockholm. He then worked at INSERM in Lyon until 2001, after which he moved to the United States. At the University of Chicago, he holds appointments in the psychology and psychiatry and behavioral neuroscience departments and leads research programs that explore how children and adults develop social understanding.

Research focus
Decety’s work spans developmental, affective, and social neuroscience to explain how people judge actions, feel for others, and decide what is fair. He has helped establish that mental simulation—imagining performing an action—activates brain areas similar to actually doing the action. This idea extends to empathy and social cognition, linking imagination and brain activity to how we relate to others.

Key findings
He emphasizes that empathy can motivate caring but does not automatically produce fair or just behavior. Empathy tends to be strongest for familiar people or groups, which can bias decisions. He argues that perspective-taking and reasoning about others’ situations may promote justice more reliably than emotional sharing alone. In studies with people who show psychopathic traits, Decety has found reduced activity in brain regions tied to value, emotion, and social understanding when perceiving harm, highlighting a neural link between empathy, moral judgment, and prosocial behavior.

Forensic and “dark morality” work
Decety investigates how moral beliefs can drive violence and how biological predispositions interact with culture to shape moral choices. He studies the neural mechanisms behind moral judgments in people who commit violent acts, using advanced imaging techniques to uncover how empathy and attention influence moral decisions.

Cross-cultural and developmental work
He has conducted large international studies on how children develop fairness and generosity. Findings suggest that cognitive skills such as theory of mind and executive function predict altruism more than empathy alone, and culture influences when children adopt fair behaviors. In cross-cultural fairness research, differences in individualism and collectivism helped explain variations in children’s generosity.

Religion and morality
In 2015 Decety published a study examining religion and morality in children, suggesting religious households were less altruistic. He later retracted the study after discovering an analysis error. The corrected view found that country of origin was the primary predictor of outcomes, with any religious effects being small and not universal.

Decety’s work helps explain how biology, culture, and experience shape social behavior, empathy, and moral choices.