A Swedish study in which non-amputees' brains were tricked into believing the subjects had an extra hand have opened the door to further understanding of how to treat phantom limb pain in amputees. Researchers found that 74% of participants in the study experienced the sensation of having the extra limb during the experiments. "Our results show that the sight of a physical hand is remarkably unimportant to the brain for creating the experience of one's physical self," said Arvid Guterstam, the study's lead author.

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