The effects of depth perception in disparity conditions on preference

-We evaluated the effects of disparity conditions such as degree of crossed/uncrossed disparity on the preference occurring during the cognitive process of preference judgment by using psychological and physiological indices. First, we performed paired comparisons of 20 novel shapes without disparity in order to select eight stimuli with minimum bias during preference judgment. Second, we investigated the effects of parallax characteristics on the feeling of preference by using 24 stimuli created by adding three disparity conditions (0.3°, -0.3° and -1.1°) to the eight previously determined stimuli. Moreover, psychological indices were determined by paired comparisons of preference judgment and physiological indices were determined by measurements of eye movement, eye fixation time, and view count during the process of preference judgment. The paired comparisons showed that the participants preferred higher crossed disparity and higher parallax angles. The eye movement measurements showed that eye fixation time and view count increased during conditions of crossed disparity rather than uncrossed disparity, and this increase was directly proportional to the degree of parallax angle. We argue that the reasons for this may be related to the attraction of the crossed disparity and the familiarity and novelty that complements the addition of parallax.