Griffiths admits it is possible that what he’s seeing is some form of temporary psychosis, and he plans to test for delirium in an upcoming experiment, but he seriously doubts that diagnosis accurately describes what is going on with his volunteers. “Patients suffering from delirium find it really unpleasant,” he points out, “and they certainly don’t report months later, ‘Wow, that was one of the greatest and most meaningful experiences of my life.’ ”
