Abstract
We measured the perceived depth defined by motion parallax and/or size cue to examine the interaction of depth information from these two cues. The test stimulus consisted of 320 white discs distributed in a virtual three-dimensional space randomly either in front of or behind a CRT display. In the motion parallax only condition, the positions of the discs were shifted according to a monocularly viewing observer's head position, which oscillated horizontally. In the size cue only condition, the sizes of the discs were graded according to their distances from an observer viewing the stimulus while standing still. The results showed that perceived depth was very limited in the motion parallax only and size cue only conditions, while much greater depth was perceived when the two cues were available simultaneously. It appears that depth information from these two cues are integrated in a nonlinear fashion.
