Dr. Henrik Ehrsson of University College London's Institute of Neurology and the Karolinska Institute in Stockholm, explained that he was interested in a person's perception of the "self."In totally unrelated news, John "Wars 'R US" Howard wants you to know that he has never been to a strip club.
"I'm interested in the question of why I feel that my self is located inside my physical body. How does my brain know that I am standing right here," he said.
And what would happen to the self if a person could effectively move their eyes to another part of the room and observe themselves from an outside perspective? Would the self move with the eyes, or stay in the body, he wondered.
So seated volunteers were fitted with head-mounted video displays that allowed them to view themselves from behind, using a pair of video cameras, one for each eye.
A researcher would stand behind them and extend a plastic rod which they could see toward the area just below the cameras. At the same time another plastic rod, which they could not see, touched their chest.
The volunteers said they experienced the feeling of being behind their own body watching. Many found it "weird" and seemingly real, though not scary.
They felt "that their center of awareness 'self' is located outside their physical bodies and that they look at their bodies from the perspective of another person," he reported.
"The idea is to change the visual input and its relationship to the tactile information," he said. "The brain is always trying to interpret sensory information. The brain can trick itself."
23 Aug. 2007
at 9:43:00 pm