Accession Number : AD0660442

Title :   THE EFFECT OF DISTANCE AND POSTURE OF OBSERVER ON THE PERCEPTION OF SIZE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Chi-cheng,Ching ; Jui-hsueng,Peng ; Yun-chiu,Fang

Report Date : 28 APR 1967

Pagination or Media Count : 31

Abstract : Under normal observation conditions, the size perception constancy of the observer with regard to an object has the tendency to shrink with the increase in the viewing distance. It, however, does not shrink proportionally with the increase in the distance. Using a subjective attitude of observation, the size perception of the object is, in general, smaller than complete invariance (actual size) values. Only a few individual observers display an overestimation phenomenon regarding the perceptual size of the object. The observation postures, prone, supine or bending backward affects the size perception of the observer. It tends to shrink the perceptual size. The prone postures of the observer has more prominent effect on his size perception. Proning 90 degrees has greater effect than proning 45 degrees. In other words, when the body prones forward in making the observation, the object appears smaller and when the angle of forward proning is greater, the objects appear smaller. The effect on perceptual size is the greatest when the observation is made in a bending backward posture. The perceptual size of the object becomes markedly smaller. (Author)

Descriptors :   (*VISUAL PERCEPTION, *POSTURE(PHYSIOLOGY)), ACCURACY, PERFORMANCE(HUMAN), CHINA

Subject Categories : Psychology

Distribution Statement : APPROVED FOR PUBLIC RELEASE