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Example prosaccade trial. Central checkerboard flickered at 15 Hz. For the anti-task, stimuli would be red rather than green. At each ¼ of the fixation period (1500 ms), the central square decreased in size by ¼ in order to give a “countdown” to the next trial. Similarly, at 1sec intervals during the Preparatory Period, the center square of the central checkerboard decreased in size by ¼ in order to give the participants information about the impending response requirement.
