In normal members of the population, theta waves are associated with drowsy, meditative, or sleeping states. Yet in psychopaths they occur during normal waking states—even sometimes during states of increased arousal … “Language, for psychopaths, is only word deep. There’s no emotional contouring behind it. A psychopath may say something like ‘I love you,’ but in reality, it means about as much to him as if he said ‘I’ll have a cup of coffee.’ … This is one of the reasons why psychopaths remain so cool, calm, and collected under conditions of extreme danger, and why they are so reward-driven
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