Stockholm, Sweden. Scientists have extended the body-swapping illusion to how for the first time that the size of our bodies has a profound effect on how we perceive the space around us.

When we experience our bodies as integral to our self, we are centered in our own self-awareness. We take it for granted. However, disruptions to this personal sense of unity can interfere with how we relate to our own body and distinguish it from from its surroundings.


Lacking additional evidence, it has been assumed that 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, until now there has been no way of testing this hypothesis experimentally.



Experimental Set-up. This illustration is a 6-part visual description of the experiment.

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TS-Si has published several science articles in the topic of body swap, such as:

Identity & The Illusion Of Body Swap TS-Si News Service. TS-Si.org (02 December 2008).

Illusions and Delusions Fool The Body Plan TS-Si News Service. TS-Si.org (24 February 2011).Henrik Ehrsson and his colleagues at the Karolinska Institutet have already managed to create the illusion of body-swapping with other people or mannequins. 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 journal PLoS ONE, show that the size of our bodies has a profound effect on how we perceive the space around us.

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?

"Tiny bodies perceive the world as huge, and vice versa," says study leader 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.

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