According to Gurfinkel [27], there is an internal repre- sentation of the body, or postural body scheme, which is not primarily based on sensory information and deals with the body kinematics and kinetics as well as the ori- entation of the body with respect to the vertical. This representation is “used for the perception of body posi- tion and its orientation in space and is also used for mo- tor control, including reactions directed towards main- taining stable body position