Diurnal Variations in the Functional Adjustment of the Visual Analyzer During Different Seasons (Sutochnye Izmeneniya Funktsionalnoi Nastroiki Zritelnogo Analizatora v Raznye Periody Goda),
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 14, 1970
- Accession Number
- AD0714064
Entities
People
- L. M. Kurilova
- N. A. Sukhovskaya
Organizations
- United States Army Foreign Science and Technology Center