Gravity and perceptual stability during translational head movement on earth and in microgravity.
Acta Astronaut
; 56(9-12): 1033-40, 2005.
Article
en En
| MEDLINE
| ID: mdl-15835061
ABSTRACT
We measured the amount of visual movement judged consistent with translational head movement under normal and microgravity conditions. Subjects wore a virtual reality helmet in which the ratio of the movement of the world to the movement of the head (visual gain) was variable. Using the method of adjustment under normal gravity 10 subjects adjusted the visual gain until the visual world appeared stable during head movements that were either parallel or orthogonal to gravity. Using the method of constant stimuli under normal gravity, seven subjects moved their heads and judged whether the virtual world appeared to move "with" or "against" their movement for several visual gains. One subject repeated the constant stimuli judgements in microgravity during parabolic flight. The accuracy of judgements appeared unaffected by the direction or absence of gravity. Only the variability appeared affected by the absence of gravity. These results are discussed in relation to discomfort during head movements in microgravity.
Palabras clave
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Vuelo Espacial
/
Percepción Visual
/
Ingravidez
/
Movimientos de la Cabeza
/
Gravitación
Límite:
Humans
Idioma:
En
Revista:
Acta Astronaut
Asunto de la revista:
MEDICINA AEROESPACIAL
Año:
2005
Tipo del documento:
Article
País de afiliación:
Canadá