FIG. 3.

Design of the binocular rivalry experiment. Only red grating is visible by one eye through a green filter, and only green grating is visible by the other eye through a red filter. Across the first two sessions, the red stimulus was a horizontal grating, and the green stimulus was a vertical grating. In the remaining two sessions, the colors of two directions of grating were exchanged, and within each pair of sessions, the colors of filters were exchanged. Participants experienced these four kinds of combinations of visual stimuli and visual filters in a random order within 1 day.