WHAT DOES BODY CONFIGURATION IN MICROGRAVITY TELL US ABOUT THE CONTRIBUTION OF INTRA-PERSONAL AND EXTRAPERSONAL FRAMES OF REFERENCE FOR MOTOR CONTROL

The authors report that the reorganization of body configuration durin g weightlessness is based on an intrapersonal frame of reference such as the configuration of the support surface and the position of the bo dy's center of gravity. These results stress the importance of ''knowl edge'' of the state of internal geometric structures, which cannot be directly signalled by specific receptors responsible for direct dialog ue with the physical external world.