Visual perception of the horizontal during prolonged exposure to radial acceleration on a centrifuge.

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Abstract
Although there have been many studies on perception of the horizontal and vertical, no data are available on the effects of prolonged exposure to centripetal acceleration. In the present study of visual perception of the horizontal, 4 subjects seated on a specially constructed seat in the Pensacola slow rotation room were studied during periods of constant rotation lasting for 4 hr. They were subjected to a constant change in magnitude and direction of centripetal force so that they perceived the oculogravic illusion. The results show no significant systematic changes in the oculogravic illusion during the period of constant rotation or during a 30-min. period following rotation. It was concluded that adaptation does not occur under these experimental conditions and that the oculogravic illusion is dependent upon a number of perceptual processes.

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