Perception of spatial orientation in different g-levels

Spatial orientation perception was examined in experiments on the MIR94 mission, during parabolic flight, and in ground control experiments. Space flight subjects were asked to remember their initial orientation, then turned and, with eyes closed, signal the ceiling direction. Ground-based control subjects were asked to indicate their original starting position while rotating on their backs. Results indicate a sensory conflict related to the vestibular system can lead to spatial disorientation.