Figure 1. Design of motion integration experiment.

Arrows represent motion vectors. Between the mask stimuli (0% coherent motions display), two different motions with the same coherence ratio (blue and red arrows) were sequentially presented. The angle between two motion directions was 40 degrees. The coherence ratios varied across trials. Participants reported a perceived motion direction after display offset by rotating a green line whose orientation corresponded to the angular position of the mouse cursor relative to fixation.