Accession Number : ADA258153
Title : Initial Observations on Perceptual Responses and Disturbance Produced by the Vertifuge.
Descriptive Note : Final rept.,
Corporate Author : NAVAL AEROSPACE MEDICAL RESEARCH LAB PENSACOLA FL
Personal Author(s) : Molian, E. A. ; Guedry, F. E. ; Lentz, J. M.
Report Date : AUG 1991
Pagination or Media Count : 22
Abstract : Perceptions of pitch and ratings of disturbance were obtained from six subjects with the Dynasim's Vertifuge cockpit configured in the centripetal heading. Verbal descriptions of transient responses during change in pitch followed expectations based on the combination of angular accelerations, cross- coupled angular accelerations, and resultant linear accelerations occurring during the transient phase of stimuli. Magnitude ratings of pitch during the steady-state phase of stimuli suggested the presence of adaptation effects that alter perceptions according to the order of the stimuli used. Further experimentation is needed to establish the significance of adaptation effects. Mean settings of the visual horizontal were fairly well predicted by the angle of the resultant of gravity and the centripetal vector calculated at the radial distance of the head from the center of rotation. Despite large pitch-up perceptions under some conditions, disorientation stress and/or nausea were not prominent; Vertifuge angular velocity was limited to 1.48 rad/s, which with a 30-deg pitch-up of the cockpit, produced perceived pitch-up attitudes approaching 90 deg in some subjects.
Descriptors : *NAVAL AVIATION , *RESPONSE , *SOUND PITCH , *VERTIGO , VELOCITY , ANGLES , STEADY STATE , TRANSIENTS , COCKPITS , ACCELERATION , STRESS(PHYSIOLOGY) , OBSERVATION , PILOTS , MOTION , PHASE , VECTOR ANALYSIS , GRAVITY , RATINGS , STIMULI , MEAN , ADAPTATION , HEAD(ANATOMY) , ROTATION , SENSORY DEPRIVATION , NAUSEA , RADIAL VELOCITY.
Subject Categories : PERSONNEL MANAGEMENT AND LABOR RELATIONS
MEDICINE AND MEDICAL RESEARCH
Distribution Statement : APPROVED FOR PUBLIC RELEASE