title: Space flight: III. Isolation of perceptual variable in parabola flight sickness with countermeasure to lower gastric pH.
abstract: Two factors of space sickness are discussed, one perceptual and the other physiological. Data from 2 adults on KC-135 airplane parabolic flights.
mesh_terms: D005745:Gastric Acidity Determination; D006801:Humans; D007699:Kinesthesis; D009041:Motion Sickness / Q000209:etiology* / Q000523:psychology; D009949:Orientation; D013026:Space Flight; D014893:Weightlessness