○  TED英语演讲稿：解密爱情与出轨  ○

　　And last but not least, it is an obsession. When I put these people in the machine, before I put them in the MRI machine, I would ask them all kinds of questions. But my most important question was always the same. It was: "What percentage of the day and night do you think about this person?" And indeed, they would say, "All day. All night. I can never stop thinking about him or her."

　　And then, the very last question I would ask them -- I would always have to work myself up to this question, because I am not a psychologist. I don't work with people in any kind of traumatic situation. And my final question was always the same. I would say, "Would you die for him or her?" And, indeed, these people would say "Yes!" as if I had asked them to pass the salt. I was just staggered by it. So we scanned their brains, looking at a photograph of their sweetheart and looking at a neutral photograph, with a distraction task in between. So we could look at the same brain when it was in that heightened state and when it was in a resting state. And we found activity in a lot of brain regions. In fact, one of the most important was a brain region that becomes active when you feel the rush of cocaine. And indeed, that's exactly what happens.

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