Influence of Multi-Cue Interaction on Human Depth Perception in Three-Dimensional Space.

backgroundWith the widespread application of three-dimensional (3D) display technology, enhancing the realism of users' experience in virtual 3D space has become important. A deep understanding of the mechanisms of human depth perception is therefore crucial.

objectiveThis study aims to investigate the influence of motion parallax, color, and object position cues on depth perception in 3D space.

methodRandom-dot stereograms based on binocular disparity cues were constructed; three experiments were designed, varying the stimulus movement speed, color, and position; two-alternative forced-choice (2AFC) psychophysical paradigms were employed to collect participants' responses regarding depth perception; and statistical analyses were conducted to examine the influences of these three cues on depth perception specified by binocular disparity.

resultsA relatively small amount of motion parallax indicated a certain inhibitory effect on depth perception, whereas a larger amount might enhance the perceived depth. Introducing red, green, or blue color to the moving stimuli might also have a certain promoting effect. Furthermore, a significant difference in perceived depth was observed when the positions of the Test Stimulus and the Standard Stimulus differed within a trial, which might involve areas of higher-level brain function (such as visual attention). In conclusion, when multiple visual cues are present concurrently, they exhibit complex interactions that affect human depth perception.