Researchers use virtual-reality avatars to create 'out-of-body' experience

Volunteers experienced the virtual bodies as if they were their own, with possible applications in computer games or to transport people digitally to other locations

Alok Jha, science correspondent | guardian.co.uk

In the film Avatar, human minds are transferred into synthetic bodies. Photograph: Sportsphoto Ltd./Allstar

In the film Avatar, explorers on the planet Pandora transmit their minds into alternative bodies. Now scientists have come a step closer to recreating the experience in the lab.

They have successfully "projected" people into digital avatars that can move around a virtual environment. The participants experienced the digital body as if it were their own, even if the virtual humans were of the opposite sex.

The research is aimed at understanding how the brain integrates information coming from the senses in order to determine the position of the body in space. But the results could also be used in next generation computer games or for people who want to transport themselves, digitally, to other locations.

Olaf Blanke, a neurologist with the Brain Mind Institute at Ecole Polytechnique Fédérale de Lausanne in Switzerland, who led the work, used a virtual-reality (VR) setup with cameras linked to a head-mounted video display to achieve his results. He presented his work on Thursday at the annual meeting of the American Association for the Advancement of Science.

It is an extension of previous work by the same researchers that aims to recreate out-of-body experiences. These are defined as situations where a person who is awake sees their own body from somewhere outside themselves. This can occur when brain function has been damaged through a stroke, epilepsy or drug abuse. The most common cases happen in traumatic events such as car accidents or during operations.

In those experiments, carried out by Blanke and colleagues in 2007, volunteers wore goggles containing a video screen for each eye fed fed by a pair of cameras behind the participant. Because the two images were combined by the brain into a single image, they saw a 3D image of their own back.

Experimenters then moved a plastic rod towards a location just below the cameras, in their field of view, while the participant's real chest was simultaneously touched in the corresponding position. The participants reported feeling that they were located where the cameras had been placed, watching a body in front of them that belonged to someone else.

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