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Scientists trick the brain into experiencing Barbie-doll size

Date:
May 26, 2011
Source:
Public Library of Science
Summary:
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 may have found the answer. Researchers found that the size of our bodies has a profound effect on how we perceive the space around us.

This figure displays the main experimental set-up (A), the four artificial bodies (B), and the image seen by participants during visuo-tactile stimulation (C), the Barbie doll experiment (D), object size estimation (E), and distance estimation (F).
Credit: Björn van der Hoort, Arvid Guterstam, H. Henrik Ehrsson, doi:10.1371/journal.pone.0020195.g001

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.

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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. 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.

This work was supported financially by the European Research Council, the Swedish Foundation for Strategic Research, the Human Frontier Science Programme, the James S. McDonnell Foundation, and the So¨ derbergska Stiftelsen.


Story Source:

The above story is based on materials provided by Public Library of Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Björn van der Hoort, Arvid Guterstam, H. Henrik Ehrsson. Being Barbie: The Size of One’s Own Body Determines the Perceived Size of the World. PLoS ONE, 2011; 6 (5): e20195 DOI: 10.1371/journal.pone.0020195

Cite This Page:

Public Library of Science. "Scientists trick the brain into experiencing Barbie-doll size." ScienceDaily. ScienceDaily, 26 May 2011. <www.sciencedaily.com/releases/2011/05/110525181416.htm>.
Public Library of Science. (2011, May 26). Scientists trick the brain into experiencing Barbie-doll size. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2011/05/110525181416.htm
Public Library of Science. "Scientists trick the brain into experiencing Barbie-doll size." ScienceDaily. www.sciencedaily.com/releases/2011/05/110525181416.htm (accessed October 25, 2014).

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