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Is Hypnosis All in Your Head? Brain Scans Suggest Otherwise - The New York Times

He said one particularly intriguing finding was that hypnotized subjects showed decreased interaction between a region deep in the brain that is active in self-reflection and daydreaming and areas of the prefrontal cortex involved in planning and executing tasks. That decreased interaction, Dr. Spiegel said, suggested an explanation for the lack of self-consciousness shown by hypnotized subjects.