Perceptions in Two-Dimensional and Three-Dimensional Aperture Problems

The two-dimensional (2D) and three-dimensional (3D) aperture problems are different forms of display in which moving stripes induce illusory perceptions of motion. From the viewpoint of visual psychology, this study applied a psychophysical method to determine the similarities and dissimilarities between the induced motion perceptions caused by the 2D and 3D aperture problems. The results indicate that for the 3D aperture problem, more time is required to induce motion perceptions than is required in the 2D aperture problem. The velocity thresholds of the 2D and 3D aperture problems also revealed that a certain velocity must be reached if induced motion perceptions are to occur, and the perceived motion in both cases appears to be toward the aperture edge that has the most terminal points. Generally, the 2D aperture problem is more effective at causing induced motion perception than the 3D aperture problem.