英語時差：大腦與手（上）

A surprising phenomenon sometimes occurs to people who have lost a hand. Soon after the hand is lost, they report that they can feel it again — this time when something touches the side of their face. A neurologist can lightly touch different areas on the cheek, for example, and the person will say it feels as if two spots were being touched simultaneously. One on their face, and one on their missing hand. Although this seems eerie, the explanation is not at all supernatural. Your brain is equipped with a map of your entire body. When you stub your toe, for example, the part of the brain’s map that represents your toe is activated, and you feel the sensation in a specific place.