Thursday, August 23, 2007

Scientists Induce Out-of-Body Sensation - New York Times

Scientists Induce Out-of-Body Sensation - New York Times

The out-of-body experiments were conducted by two research groups using slightly different methods intended to expand the so-called rubber hand illusion.

In that illusion, people hide one hand in their lap and look at a rubber hand set on a table in front of them. As a researcher strokes the real hand and the rubber hand simultaneously with a stick, people have the vivid sense that the rubber hand is their own.

When the rubber hand is whacked with a hammer, people wince and sometimes cry out.

The new experiments were designed to create a whole body illusion with similar manipulations.

In Switzerland, Dr. Olaf Blanke, a neuroscientist at the École Polytechnique Fédérale in Lausanne, Switzerland, asked people to don virtual reality goggles while standing in an empty room. A camera projected an image of each person taken from the back and displayed 6 feet away. The subjects thus saw an illusory image of themselves standing in the distance.

Then Dr. Blanke stroked each person’s back for one minute with a stick while simultaneously projecting the image of the stick onto the illusory image of the person’s body.

When the strokes were synchronous, people reported the sensation of being momentarily within the illusory body. When the strokes were not synchronous, the illusion did not occur....