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Results of Experiment 5, showing mean reports of clockwise apparent motion as a function of frame-to-frame phase shift, for the two-stroke (TS) and control (Con) stimuli shown in Figure 2. In negative phase shifts the direction of the shortest displacement is CCW; in positive phase shifts the direction of the shortest displacement is CW. Data at a phase shift of 0.5 are plotted twice, at the +0.5 and −0.5 positions. Left: Results at high luminance. Right: results at low luminance.
