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(a) Stimuli were composed of a counter-phase flickering Gabor target whose orientation changed smoothly over the course of 750 ms (such that the maximum target tilt matched the time course of the De Valois effect). This target was flanked to the left and right by two vertical Gabors that either (b) flickered (double-headed arrow), (c) drifted inward, or (d) drifted outward relative to the target location. Observers were required to judge the tilt of the target Gabor.
