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Effects of Gravitational and Optical Stimulation on the Perception of Target Elevation (2001)
We examined the combined effects of gravitational and optical stimulation on perceived target elevation by independently altering gravitational-inertial force and both the orientation and structure of a background visual array. Eighteen observers set a target to the apparent horizon while experiencing 1.0, 1.5, or 2.0 Gz in the human centrifuge at NASA-Ames Research Center. The target was viewed against the far wall of a box that was pitched at various angles; the box was brightly illuminated, had only its interior edges dimly illuminated, or was kept dark. Target settings were lowered as Gz increased; this effect was reduced when the box was illuminated. Also, target settings were displaced in the direction the box was pitched when it was visible. Results are attributed to the combined influence of otolith-oculomotor mechanisms that underlie the elevator illusion and visual-oculomotor mechanisms (optostatic responses) that underlie the perceptual effects of viewing pitched visual arrays.
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centrifuge, elevator illusion, gravity, human, hypergravity, optostatic responses, orientation, otolith-oculomotor, perceptual effects p, percieved target ele, pitched box, pitched visual array, vision, visual-oculomotor me
Perception and Psychophysics, 2001, 63(1): 29-35 |
