title: Psychology of spaceflight: II. Suggested bases of space motion sickness: perceptual disorientation and elevated stomach pH.
abstract: Suggested causes of space-motion sickness are inferred from the experiences of a group of astronaut candidates and from the vomit pH values of nonastronauts. Both groups experienced stimulated weightlessness in an airplane.
mesh_terms: D006801:Humans; D006863:Hydrogen-Ion Concentration; D009041:Motion Sickness / Q000209:etiology* / Q000523:psychology; D009949:Orientation; D013026:Space Flight; D013270:Stomach / Q000503:physiopathology*; D014839:Vomiting