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" ... The pain of paying, or lack thereof, has been identified in neuroeconomic examinations of people’s brains using fMRI, functional MRIs that study brain activity as it occurs. Candidates in one study were shown a DVD box set, then its price, and were asked if they would buy it. Participants whose fMRI showed increased activity in the insula, a part of the brain that is active during times of distress, were less likely to make the purchase. ... "