Researchers claim to have the first direct evidence of a century-old idea that using tools changes the way the human brain perceives the size and configuration of our body parts, according to a linkurl:study; published in the June 23 issue of __Current Biology__.
Holding the tool at an elongated
arm's length

Image: Lucilla Cardinali
"To be accurate in doing an action with a tool, you need to make the tool become a part of your body," the study's first author linkurl:Lucilla Cardinali; of the French National Institute for Health and Medical Research (INSERM) in Bron and Claude Bernard University in Lyon told __The Scientist__. "Your brain needs to take into account that the action is performed with something added to your body part." In 1911, British neurologists linkurl:Henry Head; and linkurl:Gordon Holmes; introduced the theory that body image is mutable. Our brains are constantly processing visual and tactile feedback about...

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