Although mystical experiences can't easily be diced up and quantified, they affect a surprisingly large number of people. National surveys in the United States and England find that roughly one-third of adults say that they've had, for example, a moment of sudden religious awakening or felt close to a powerful, spiritual force that seemed to lift them out of themselves.
Such experiences may extend far back into human prehistory. According to archaeologists, cave and rock art from Africa to Australia depicts shamans' supernatural encounters, which occurred during conscious states achieved through chanting, dancing, hallucinogenic drugs, or other means (SN: 10/5/96, p. 216). In traditional societies, shamans act as spiritual leaders and healers.
"Mystical experiences occur on a continuum," says psychologist David M. Wulff of Wheaton College in Norton, Mass. "Even if they're not religiously inspired, they can be striking, such as the transcendent feelings musicians sometimes get while they perform. I have colleagues who say they've had mystical experiences, although they have various ways of explaining them."
In Varieties of Anomalous Experience, Wulff reviews current scientific evidence and theories about mystical experience. He defines such events as those that deviate sharply from a person's ordinary state of awareness and leave the person with an impression of having encountered a higher reality. Mystical encounters are rare and fleeting, yet they stand out as defining moments in the lives of those who have them, Wulff says.