Accession Number : AD0638486

Title :   INFLUENCE OF CONTACT CUES ON THE PERCEPTION OF THE OCULOGRAVIC ILLUSION.

Descriptive Note : Joint rept.

Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA

Personal Author(s) : Clark,Brant ; Graybiel,Ashton

Report Date : AUG 1966

Pagination or Media Count : 13

Abstract : The purpose of the experiment was to study the influence of otolith and nonotolith information in the perception of the visual horizontal during rotation. Five normal men and five men with defective labyrinthine function acted as observers. All measurements were made in a room which could be rotated. Initial, static measurements were made while the men stood erect in the stationary room. Similar measurements were made during rotation while the observer stood on a platform set to the resultant horizontal with head and body aligned with resultant force. Data were also obtained with three other combinations of head and body position. This procedure was designed to produce two situations for the normal men in which otolith and nonotolith information were synergistic and three others in which they were antagonistic. The results showed that the perception of the visual horizontal during rotation in this situation is quite different from that found when the observer is rigidly supported in a chair during rotation. Settings to the visual horizontal during rotation were not systematically related to differences in head and body position nor were there significant differences between the normal and L-D men. The results show that nonotolith information predominates in this experimental situation. Furthermore, the data suggest that the spatial orientation of a pilot strapped in a cockpit may be somewhat different from his spatial orientation when he is standing on a rotating space platform. (Author)

Descriptors :   (*ILLUSIONS, STRESS(PHYSIOLOGY)), (*AUDITORY PERCEPTION, STRESS(PHYSIOLOGY)), ROTATION, POSTURE(PHYSIOLOGY), PILOTS, GRAVITY, VISUAL PERCEPTION, AEROSPACE MEDICINE, VESTIBULAR APPARATUS

Subject Categories : Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE