“Most parts of the brain do different things at different times,” says Dr. David Adam, author of The Man Who Couldn’t Stop. “The amygdala, for example, plays a role in both sexual arousal and terror—but an MRI scan cannot differentiate between passion and panic . . . So what should we think when the amygdala lights up on an MRI scan when we are shown a picture of Cameron Diaz or Brad Pitt—that we are afraid of them?”
