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The simplest and best explanation for out-of-body experiences is that the person is merely fantasizing and dreaming. Because there is no scientific evidence that the soul exists — or for that matter that consciousness can exist outside of the brain — the premise behind astral projection is rejected by scientists.
Practitioners of astral travel insist that it must be real because it seems so vivid, and because some of the experiences are similar, even for people from different cultures. But it's not surprising that many people who try astral projection have similar experiences — after all, that's what the term "guided imagery" is: when an authority (such as a psychologist or astral travel teacher) tells a person what they should expect from the experience. The power of suggestion can be powerful, and a person who is told they will encounter an alien or godlike entity who imparts cosmic wisdom is likely to imagine exactly that.
One strong piece of evidence that the "travel" takes place in the mind is that those who return from out-of-body experiences can't give verifiable details or information about the places they've been or what they've seen.
According to researcher Susan Blackmore, author of "Beyond the Body: An Investigation of Out-of-the-Body Experiences," people who experience astral travel "have been found to score higher on measures of hypnotizability and, in several surveys, on measures of absorption, [a] measure of a person's ability to pay complete attention to something and to become immersed in it, even if it is not real, like a film, play, or imagined event." Out-of-body experiencers are more imaginative, suggestible, and fantasy-prone than average
Though astral projection practitioners are convinced their experiences are real and not merely dreams or fantasies,their evidence is all anecdotal — just as a person who takes peyote or LSD may be truly convinced that they interacted with God, dead people, or angels while in their altered state. It is not a coincidence that drug users refer to a psychedelic experience as a "trip."
Astral projection is an entertaining and harmless pastime that can seem profound, and in some cases even life-changing. But there's no evidence that out-of-body-experiences happen outside the body instead of inside the brain.