Perception of structure-from-motion (PSFM)

The Institutional Review Board (IRB) at Capital Normal University approved this study. Inclusion criteria included having normal or corrected vision (at least 20/40), right-handed, and with normal color vision.

They were divided into three tasks according to different stimuli in the experiment, the stimuli for the first two tasks are called cued conditions, indicating that the direction of motion can be judged easily, i.e., one rotates to the left and another rotates to the right. The difference between them is relatively small. The third task was performed with ambiguous stimulus, where subjects could see the cue rotate either to the left or to the right.