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While psychopaths don’t sit still for science and ordinary people can’t be made to think so savagely, nearly anyone can imagine what it would be like to commit the kind of legal homicide that occurs in war. To study how the brain reacts when it confronts such murder made moral, psychologist Pascal Molenberghs of Monash University in Melbourne, Australia, recruited 48 subjects and asked them to submit to functional magnetic resonance imaging (fMRI), which could scan their brains while they watched three different scenarios on video loops
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