Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Out-of-body experiences induced in the laboratory

24.08.2007
People who have come close to death sometimes report what are known as out-of-body experiences, in which they have seen themselves from somewhere else in the room.

Scientists at the Swedish medical university Karolinska Institutet have now come up with a technique that recreates this sensation in fully conscious healthy volunteers. They hope that this technique will enable them to study the relationship between the body and the 'self' in the laboratory environment.

“The idea for the study came to me several years ago”, says Dr Henrik Ehrsson, research leader in the Department of Clinical Neuroscience. “I wondered what would happen if you moved a person’s eyes to somewhere else in the room. It has been found that the visual perspective is crucial in determining how the ego is experienced.”

The experiments involve the scientists connecting two video cameras placed side by side - like robot eyes - to a display on the volunteer's head, one camera for each eye. The cameras are positioned behind the volunteers and aimed at them. The volunteers then see themselves from outside, as if they were someone else looking at them.

But to be able to induce an out-of-body experience it is also necessary for the volunteers to sense their self outside their physical body. The scientist can induce such a sensation by standing in front of the cameras and poking a point just below them, that is to say the chest of the “phantom body” – the illusory body the volunteers perceive outside their physical body – while the actual chest is touched without the volunteers seeing that this is being done.

“The brain then responds to the hand that touches the illusory body, whereupon the volunteer has a powerful experience of being several metres outside their actual body”, says Dr Ehrsson. “The self has thus moved two metres in space and left the actual body, which instead feels like an empty shell, a doll.”

To prove the illusion scientifically, Dr Ehrsson hit the phantom body of the twelve volunteers with a hammer, and measured and degree of skin sweating in response to the provocation. It was found that the volunteers exhibited the same physiological stress response as when someone's real body is threatened, but only during the periods when the volunteers were actually experiencing the out-of-body illusion.

The new tool in the laboratory environment means that it is possible for the first time to undertake scientific research on what we call the self, both fundamental research and applied research, for example in computer science.

“In the future it may be possible not just to control a person in a virtual environment but to become the virtual person, that is to say one's self will be able to move to virtual persons,” says Dr Ehrsson.

Karolinska Institutet is one of the leading medical universities in Europe. Through research, education and information, Karolinska Institutet contributes to improving human health. Each year, the Nobel Assembly at Karolinska Institutet awards the Nobel Prize in Physiology or Medicine.

Katarina Sternudd | alfa
Further information:
http://ki.se

Further reports about: Ehrsson Karolinska Institutet Laboratory volunteer

More articles from Life Sciences:

nachricht Could this protein protect people against coronary artery disease?
17.11.2017 | University of North Carolina Health Care

nachricht Microbial resident enables beetles to feed on a leafy diet
17.11.2017 | Max-Planck-Institut für chemische Ökologie

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>