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Viewing arrangement. In all but the first experiment (see Materials and Methods) observers viewed an image of the screen at an effective distance of 50 cm. In conditions requiring simulated saccades, the mirror was rotated around its center to the position shown in gray.F0 represents the observer's initial fixation; F1 represents the saccadic target. The projective images of these points are shown asF0′ and F1′.
