We all carry in our heads various mental representations of our body—one example is the well-known brain map of our sense of touch, sometimes called a homunculus. New studies show how such mental maps blur with age and readily extend to accommodate bionic limbs.
A team of scientists has developed what is believed to be the first artificial hand that has feeling. It has been attached to the arm of a 22-year-old man who lost his own hand through cancer. Researchers say it works by connecting human nerve endings with tiny electronic sensors.