Fig. 1.

Illustration of the stimuli and the experimental procedure.

(A) Our structure-from-motion (SFM) stimuli, which consisted of moving white dots, typically cause two exclusive alternating percepts: a sphere rotating either toward (a) or away (b) from the viewer. Note that the size of the white dots is magnified in this figure for visualization. (B) In fMRI session, SFM stimuli were presented on the screen for 30.5 s (15 EPI volumes). Participants were asked to report their percept by pressing or holding one of three buttons (toward, away, or not sure/mixture) during stimulus presentation. Note that stimuli were presented dichoptically in order to add disparity information for the replay condition: the participants used prism glasses and the screen was split by a black cardboard divider to aid fusion and ensures monocular presentation of each image.