How does the brain integrate complex information from the eyes (visual system) and the organs of balance (vestibular system)? For instance, why do people feel dizzy after spinning around? What happens to our sense of up when these sensory signals don’t agree on earth, micro-gravity flights or orbiting the Earth in space (VISO)! Why do astronauts make mistakes pointing or grasping for objects when in orbit (PMDIS)? What effects the perception of ambiguous shapes in space (BISE)? How does altered gravity states effect illusory self motion or vection? What happens when you conduct experiments underwater? How does altering the flow field affect the illusory sensation of the motion (SeeJitter)?