Accession Number : AD0694007
Title : DIRECTIONAL DIFFERENCES IN VISUAL ACUITY DURING VERTICAL NYSTAGMUS.
Descriptive Note : Joint rept.,
Corporate Author : NAVAL AEROSPACE MEDICAL INST PENSACOLA FLA
Personal Author(s) : Hixson,W. Carroll ; Niven,Jorma I.
Report Date : 16 JUL 1969
Pagination or Media Count : 13
Abstract : Twenty naval aviator candidates were exposed to four ramp velocity test profiles generated by the Human Disorientation Device. The head orientation was such that the y (left-right) axis was on the Earth-vertical rotational center of the device, with the resulting alpha y pitch stimulation eliciting vertical nystagmus which was recorded on all four profiles. During two of the profiles, the subjects were required to observe a visual target consisting of a vertically aligned series of dots and to report the duration of the period where dot fusion or target blur occurred as a result of the vertical nystagmus. It was found that during pitch forward angular acceleration resulting in nystagmus with a slow component upward, the loss of visual acuity was of a significantly longer duration than that present during stimulation in the opposite direction. Directional differences in the vertical nystagmus response were also observed. (Author)
Descriptors : (*VISUAL ACUITY, *NYSTAGMUS), VESTIBULAR APPARATUS, ACCELERATION, ROTATION, STIMULATION(PHYSIOLOGY), RESPONSE(BIOLOGY)
Subject Categories : Stress Physiology
Distribution Statement : APPROVED FOR PUBLIC RELEASE