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Empathy, the ability to share another individual's emotional state and/or experience, has been suggested to be a source of prosocial motivation by attributing negative value to actions that harm others. The neural underpinnings and evolution of such harm aversion remain poorly understood. Here, we characterize an animal model of harm aversion in which a rat can choose between two levers providing equal amounts of food but one additionally delivering a footshock to a neighboring rat. We finddoi:10.1016/j.cub.2020.01.017 pmid:32142701 fatcat:px2qktw3kzbfjdyadped6ky52u