was first described by Botwinik and Cohen in 1998. Subjects with normal brain function were positioned so that their left hand was hidden out of sight. They saw a realistic rubber left hand in front of them. The experimenters stroked both the subjects’ hidden left hand and the visible rubber hand with a brush. The experiment showed that if both hands were stroked synchronously and in the same direction, the subjects began to perceive the rubber hand as their own. When they were asked to use their right hand to point to their left hand, most of the time they pointed to their rubber hand. If the real hand and the rubber hand were stroked in different directions or at different times, the subjects did not perceive the rubber hand as their own.