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How Pain is Related to Pure Perception
In their opinion, the findings revealed a profound top-down effect of body image on body tissues.
"The brain is capable of many wonderful things based on its perception of how the body is doing and the risks to which the body seems to be exposed," said G. Lorimer Moseley, who is now at the Prince of Wales Medical Research Institute in Australia.
In the study, the researchers asked ten right-handed patients with chronic pain and dysfunction in one arm to watch their own arm while they performed a standardized set of ten hand movements.
The participants repeated the movements under four conditions: with no visual manipulation, while looking through binoculars with no magnification, while looking through binoculars that doubled the apparent size of their arm, and while looking through inverted binoculars that reduced the apparent size of their arm.
As the patients' pain was always worse after movement than it was before, the extent to which the pain worsened depended on what people saw.
Specifically, the pain increased more when participants viewed a magnified image of their arm during the movements, and-perhaps more surprisingly-the pain became less when their arm was seen through inverted binoculars that minimized its size.
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