Accession Number : AD0714064

Title :   Diurnal Variations in the Functional Adjustment of the Visual Analyzer During Different Seasons (Sutochnye Izmeneniya Funktsionalnoi Nastroiki Zritelnogo Analizatora v Raznye Periody Goda),

Corporate Author : ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER WASHINGTON D C

Personal Author(s) : Kurilova,L. M. ; Sukhovskaya,N. A.

Report Date : 14 APR 1970

Pagination or Media Count : 14

Abstract : A study was made of changes in the dark-adaptation curve of two subjects, ages 35 and 40, and its variation according to time of day and season. Two indices were used: intensity threshold (characterizing level of sensitization) and threshold area of light stimulus (reflecting level of mobilization). All observations were carried out under uniform conditions in a dark testing room; thresholds were determined with a model AM adatometer and with a device designed by one of the authors and described in a previous work. Differences between the two subjects were noted and attributed to individual variation. Curves for different times of the year were found; shifts of maxima in the curves were correlated with the changes in the time of sunrise and sunset in different seasons. The results indicate the presence of a circadian rhythm of light sensitivity, varying seasonally, which persists even when the subject is tested in a dark room without the influence of natural illumination. These findings will be of interest in labor physiology, since work efficiency depends to a degree upon the punctuality of adaptive reactions of the visual analyzer. (Author)

Descriptors :   (*VISUAL PERCEPTION, PERIODIC VARIATIONS), (*THRESHOLDS(PHYSIOLOGY), ANALYSIS OF VARIANCE), PERFORMANCE(HUMAN), SENSITIVITY, ILLUMINATION, CURVE FITTING, ADAPTATION(PHYSIOLOGY), TEST METHODS, USSR

Subject Categories : Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE