Fig. 1.

Time course of stimulus presentation in one trial. Each trial consisted of two stimulation phases: the first and second phases. The first phase preceded the second phase, and the bar image was intermittently presented throughout these phases, keeping the orientations of the bars constant. In the first phase, the fixation point was immediately changed to a cross at a probability of 10%, and the participants were asked to respond to the change. In the second phase, the Necker cube was continuously presented at the center of the screen. Participants were asked to view the Necker cube and report its initial percept in facing-orientation. Following the second phase, the target image was presented and the fixation point changed to a green square (a cue). The orientations of the bars in the target image changed by 90° in the DEV condition and did not change in the STD condition (the change in the orientations of the bars for the DEV condition was the deviant stimulus, and the non-changed orientations for the STD condition was the standard stimulus). In both conditions, participants were asked to report the facing orientation of the Necker cube after the cue