title: Rapid perceptual adaptation to high gravitoinertial force levels: evidence for context-specific adaptation.
abstract: Subjects exposed to periodic variations in gravitoinertial force (2-G peak) in parabolic flight maneuvers quickly come to perceive the peak force level as having decreased in intensity. By the end of a 40-parabola flight, the decrease in apparent force is approximately 40%. On successive flight days, the apparent intensity of the force loads seems to decrease as well, indicating a cumulative adaptive effect. None of the subjects reported feeling abnormally "flight" for more than a minute or two after return to 1-G background force levels. The pattern of findings suggests a context-specific adaptation to high-force levels.
mesh_terms: D000222:Adaptation, Physiological; D000337:Aerospace Medicine; D006112:Gravitation; D006801:Humans; D008297:Male; D010465:Perception / Q000502:physiology*