Accession Number : AD0435544


Title :   THE EFFECTS OF TRANSIENT WEIGHTLESSNESS ON BRIGHTNESS DISCRIMINATION.


Descriptive Note : Rept. for Apr-Aug 63,


Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y


Personal Author(s) : White,William J


Report Date : Mar 1964


Pagination or Media Count : 17


Abstract : Contrast thresholds of six semisupine, visually adapted subjects were obtained under short (10-15 sec.) periods of weightlessness and under 1-G control conditions. The target, viewed binocularly, subtended 1.5 and the background 2.6. Three background luminance levels were used: 0.03, 0.28 and 30.0 ft-L. The contrast required to detect the target was found to be slightly, but consistently, lower under the weightless condition than under the control, 1-G, condition. Under the weightless condition the contrast required to detect the target averaged 12.56% at 0.03 ft-L background luminance, 6.4% at 0.28 ft-L background luminance and 3.99% at 30.0 ft-L background luminance. The corresponding contrasts required under the control, 1-G, condition averaged 15.14%, 7.05% and 4.45% respectively. (Author)


Descriptors :   *WEIGHTLESSNESS , BRIGHTNESS , VISUAL PERCEPTION , THRESHOLDS(PHYSIOLOGY) , REACTION(PSYCHOLOGY) , MEASUREMENT , ADJUSTMENT(PSYCHOLOGY) , ANALYSIS OF VARIANCE , ACCELERATION , STRESS(PHYSIOLOGY)


Distribution Statement : APPROVED FOR PUBLIC RELEASE