Scientists trick the brain into Barbie-doll size
Imagine shrinking to the size of a doll in your sleep. When you wake up, will you perceive yourself as tiny or the world as being populated by giants? Researchers at Karolinska Institutet in Sweden may have found the answer.
According to the textbooks, our perception of size and distance is a product of how the brain interprets different visual cues, such as the size of an object on the retina and its movement across the visual field. Some researchers have claimed that our bodies also influence our perception of the world, so that the taller you are, the shorter distances appear to be. However, there has been no way of testing this hypothesis experimentally – until now.
Henrik Ehrsson and his colleagues at Karolinska Institutet have already managed to create the illusion of body-swapping with other people or mannequins (see previous press release). Now they have used the same techniques to create the illusion of having a very small doll-sized body or a very large, 13-foot tall body. Their results, published in the online open access journal PLoS ONE, show for the first time that the size of our bodies has a profound effect on how we perceive the space around us.
“Tiny bodies perceive the world as huge, and vice versa,” says study leader Henrik Ehrsson.
The altered perception of space was assessed by having subjects estimate the size of different blocks and then walk over to the blocks with their eyes shut. The illusion of having a small body caused an overestimation of size and distance, an effect that was reversed for large bodies.
One strategy that the brain uses to judge size is through comparison – if a person stands beside a tree it computes the size of both. However, the sensed own body seems to serve as a fundamental reference that affects this and other visual mechanisms.
“Even though we know just how large people are, the illusion makes us perceive other people as giants; it’s a very weird experience,” says Dr Ehrsson, who also tried the experiment on himself.
The study also shows that it is perfectly possible to create an illusion of body-swapping with extremely small or large artificial bodies; an effect that Dr Ehrsson believes has considerable potential practical applications.
“It’s possible, in theory, to produce an illusion of being a microscopic robot that can carry out operations in the human body, or a giant robot repairing a nuclear power plant after an accident”, he says.
Publication: “Being Barbie: the size of one's own body determines the perceived size of the world”, Björn van der Hoort, Arvid Guterstam, Henrik Ehrsson, PLoS ONE, online 25 May 2011.
Journal website: www.plosone.org
For further information, please contact:
Dr Henrik Ehrsson, Associate Professor
Department of Neuroscience, Karolinska Institutet
Phone: +46 (0)8 524 872 31
Email: henrik.ehrsson@ki.se
Björn van der Hoort, doctoral student
Tel: +46 (0)8 524 870 66
E-post: bvdhoort@gmail.com
KI Press Office: +46 (0)8-524 860 77 or pressinfo@ki.se
Download photos and video material: ki.se/pressimages
Karolinska Institutet is one of the world’s leading medical universities. It accounts for over 40 per cent of the medical academic research conducted in Sweden and offers the country’s broadest range of education in medicine and health sciences. Since 1901 the Nobel Assembly at Karolinska Institutet has selected the Nobel laureates in Physiology or Medicine.
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