Brain scan reveals out-of-body illusion
The sense of owning oneās body and being located somewhere in space is so fundamental that we usually take it for granted. To the brain, however, this is an enormously complex task that requires continuous integration of information from our different senses in order to maintain an accurate sense of where the body is located with respect to the external world. Studies in rats have shown that specific regions of the brain contain GPS-like āplace cellsā that signal the ratās position in the room ā a discovery that was awarded the 2014 Nobel Prize in Physiology or Medicine. To date, however, it remains unknown how the human brain shapes our perceptual experience of being a body somewhere in space, and whether the regions that have been identified in rats are involved in this process.
In a new study, published in the scientific journal Current Biology, the scientists created an out-of-body illusion in fifteen healthy participants placed inside a brain scanner. In the experiment, the participants wore head-mounted displays and viewed themselves and the brain scanner from another part of the room. From the new visual perspective, the participant observes the body of a stranger in the foreground while their physical body is visible in the background, protruding from the bore of the brain scanner. To elicit the illusion, the scientist touches the participantās body with an object in synchrony with identical touches being delivered to the strangerās body, in full view of the participant.
āIn a matter of seconds, the brain merges the sensation of touch and visual input from the new perspective, resulting in the illusion of owning the strangerās body and being located in that bodyās position in the room, outside the participantās physical body,ā says Arvid Guterstam, lead author of the present study.
Different places in the scanner room
In the most important part of the study, the scientists used the out-of-body illusion to perceptually āteleportā the participants between different places in the scanner room. They then employed pattern recognition techniques to analyze the brain activity and show that the perceived self-location can be decoded from activity patterns in specific areas in the temporal and parietal lobes. Furthermore, the scientists could demonstrate a systematic relationship between the information content in these patterns and the participantsā perceived vividness of the illusion of being located in a specific out-of-body position.
(Image caption: Brain regions in which the scientists could successfully decode the participantsā perceived self-location from patterns of neural activity. Credit: Malin Bjƶrnsdotter/Arvid Guterstam)
āThe sense of being a body located somewhere in space is essential for our interactions with the outside world and constitutes a fundamental aspect of human self-consciousness,ā says Arvid Guterstam. āOur results are important because they represent the first characterization of the brain areas that are involved in shaping the perceptual experience of the bodily self in space.ā
One of the brain regions from which the participantsā perceived self-location could be decoded was the hippocampus ā the structure in which the Nobel Prize awarded Ā“'place cellsā have been identified.
āThis finding is particularly interesting because it indicates that place cells are not only involved in navigation and memory encoding, but are also important for generating the conscious experience of oneās body in space,ā says principal investigator Henrik Ehrsson, professor at the Department of Neuroscience, Karolinska Institutet.
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