Abstract

We investigated the effect of preceding luminance depth cues on stereopsis perception time. The stimulus was a random-dot stereogram which contained two horizontal bands defined by binocular disparity: the dots inside of one of the bands had crossed disparity (the band was closer than the background) and those inside of the other were uncorrelated. The dots in the disparity bands were lighter than those in the background so that the both bands appeared to be closer by monocular observation. Observer’s task was to report which band appeared to be closer. The method of constant stimuli was used to determine the stereopsis perception time as the stimulus presentation duration which gave 75 (varied between 0 and 1000 msec). The results show that the perception time is the shortest when the luminance cue lead time is about 200 msec. Since little effect of the lead time was found when dots inside of the disparity bars were darker than those in background, it is suggested that the optimum lead time of luminance cue is a reflection of the dynamic interaction between monocular and binocular depth cues rather than that of attention.

© 1993 Optical Society of America