Researchers discover brain scan signature that can determine when people feel pain

In a set of recent studies, researchers were able to determine whether individual subjects were feeling pain -- simply by observing scans of their brain activity. As detailed in The New England Journal of Medicine, the studies involved 114 different individuals, who had their brains scanned using functional magnetic resonance imaging. During the scans, they were exposed to heat of varying degrees while being asked to rate their pain level on a scale of one to nine. The researchers then looked at...