In what has been called the largest parapsychological experiment to date, psychologist Stanley Krippner and associates explored ESP and the dream phase of sleep with the assistance of the audience of a famous Grateful Dead concert in Port Chester NY in 1971. (Journal of the American Society of Psychosomatic Dentistry and Medicine) Krippner, who was at that time the head of the renowned Dream Laboratory at New York’s Maimonides Medical Center, is an illustrious psychologist who has been uncommonly unafraid of anomalous experiences and altered states of consciousness. The Dead were apt collaborators in an investigation of telepathy given the uncanny and unparalleled psychic amalgamation they achieved in their playing (and, some would say, achieved with their audiences as well), especially at the further reaches of their jams. (“We’re not in the entertainment business, we’re in the transportation business. We move minds.” — Mickey Hart) You can also read about the studies here (Fortean Times).