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Schematic of procedure for pro/anti-saccade experiment. (a) Sequence of visual stimuli. (b) Eye position. A trial from an anti-saccade block is shown (saccade made away from the box-shaped “go” cue). Eye movement triggered the appearance of a circle (frame 3) and subjects were required to compare its duration with that of a reference stimulus (frame 5). In pro-saccade trials, the circle replaced the cross within the box-shaped cue. Stimuli shown in grey were actually displayed in red.
