Thomas Metzinger had his first out-of-body experience when he was nineteen. He was on a ten-week meditation retreat in the Westerwald, a mountainous area near his home, in Frankfurt. After a long day of yoga and meditation, he had a slice of cake and fell asleep. Then he awoke, feeling an itch on his back. He tried to scratch it, but couldn’t his arm seemed paralyzed. He tried to force the arm to move, and, somehow, this shifted him up and out of his body, so that he seemed to be floating above himself. Gazing out into the room, he was both amazed and afraid. He heard someone else breathing and, in a panic, looked around for an intruder. Only much later did he realize that the breathing had been his.

At the time, in the early nineteen-eighties, Metzinger was a philosophy student researching the mind-body problem at the Johann Wolfgang Goethe-Universitt. During the postwar years, Theodor Adorno and Max Horkheimer had made the university’s Institute for Social Research the Frankfurt School a center of neo-Marxist thought, and the campus remained a politically radical place. In Britain and America, philosophers, computer scientists, psychologists, and neuroscientists were working together to reconceive the mind as a purely physical system created by the brain. In Metzinger’s department, such theories were denounced as anti-human and proto-fascist. Metzinger considered himself a radical he had waist-length hair, and was proud to have been teargassed while protesting the U.S. military but also a rationalist. Immersing himself in the work of the Anglophone philosophers, he’d eventually become convinced that his soul was made by his brain. He was, therefore, doubly shocked by his out-of-body experience, which had seemed irrevocably real. Could materialism be wrong? Could consciousness exist immaterially, outside of the body? He admonished himself: “How arrogant I have been!”

Metzinger began reading about out-of-body experiences. He learned that between eight and fifteen per cent of the population reports having had an “O.B.E.” perhaps during the night, or after surgery and that, for millennia, people have seen in such experiences evidence for various mystical theories of the soul. (Many religious traditions hold that there is a subtle body, or immaterial version of the self, capable of travelling through space.) Meanwhile, on occasional evenings, he floated around his room. One night, he tried to use the light switch (it didn’t work); he decided to fly through the window and visit his girlfriend, but woke up instead. Metzinger began experimenting on himself. Following the advice of New Age astral travellers, he stopped drinking liquids at noon, stared at a glass of water in his kitchen, and then slept with salt in his cheek, hoping to travel back to the glass at night. Before a minor surgery, he persuaded his anesthesiologist to alter his medication so that he could wake up early enough to experience the effects of the drug ketamine, which is famous for inducing out-of-body experiences. The salt had no effect, and the ketamine resulted in hours of unpleasant phantasmagoric hallucinations. Metzinger could find no way to produce O.B.E.s on demand, or to study them systematically.

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