National audienceDo our abilities to engage in social relations and live with other people reside in our brain? Science's keen interest in the workings of the brain is now spreading to the public at large. It is also feeding into large-scale research programmes focusing on sympathy and sociability. It is easy for this notion to spread as it is based on an assumpion that society is no more than the sum of individual relationships. Should we worry over this reductive perspective on social life?Nos capacités à nouer des relations sociales et à vivre avec les autres se trouvent-elles dans notre cerveau ? La curiosité pour le fonctionnement cérébral touche désormais le grand public. Elle alimente aussi de vastes programmes d'études portant sur l...