In the first study, apparent motion was tilted back at four different angles. In the second study, consistency of the four depth cues was varied. Results indicated that influence of each depth cue was additive. When all cues specified tilt in depth, velocity of apparent motion remained relatively constant over separation in 3-D space. Four elements are presented cyclically in either the clockwise or counterclockwise order.
Arrows represent experienced trajectory when stimuli are presented clockwise at various rates.
When presentation rate is very slow, experienced trajectory is diamond shaped. When presentation rate is just above threshold, experienced trajectory curves into a circle When presentation rate is just below threshold, direction of presentation is indiscernible. When presentation rate is very rapid, no motion is experienced. Angles were chosen so that spatial separation increased from one to two in equal increments. Stimuli are shown for the 0.0 tilt condition.