Displacement Detection across Saccade in a Whole Visual Field

Abstract

To obtain characteristics of displacement perception across saccade in a whole visual field, we compared thresholds for detection of stimulus displacement across saccades in a whole visual field with those in a small visual field. A LCD projector, equipped with a fish-eye lens, projected a large visual stimulus on a 180 deg-hemicylindrical screen. Stimuli were multi-colored mondrian patterns. In the large field condition, the stimulus was presented on a whole visual field. In the small field condition, the stimulus was presented only inside a rectangle window at the central vision. The subject made a 12 deg horizontal saccade to the leftward or the rightward directions. During saccade, the stimulus pattern was displaced horizontally. The results indicate that there is little difference in displacement thresholds between large and small field conditions for rightward saccades, but there is a noticeable difference between the conditions for leftward saccades.