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.

The purpose of this study is to investigate the temporal characteristics of motion perception under the use of a modified dynamic random-dot kinematograms (DRDK). A frame of animated DRDK was further divided into 2 or 3 subframes, which is named as multi-partite stimulus. The original DRDK rendered motion of a rectangle, reciprocally moving into right-and-left or up-and-down. The subjects’ task was to segregate the figure from the dynamic random-dot background, or to discriminate the direction of its motion. In the segregation task, the subjects were able to perceive a rectangle, when presented within the moderate duration of a fullframe. Compared with segregation task, apparent motion perception was not degraded in the direction discrimination task. The results of this study suggest that the duration of a fullframe, not the SOA between subframes, had an important role in the integration of multi-partite DRDK into a firm percept,especially in pattern segregation.

An attempt to measure responses of near triad, i.e., convergence eye movement, binocular accommodation and pupillary near reflex, was performed. Dynamic measurement with time resolution of 1/30s could be carried out from distant place of 1.2 meter. A video refraction technique was applied for the measurement of accommodation. Commercially available video refraction unit was employed. Obtained image from the unit was once recorded to video tapes and was analysed by a computer using freely distributed image analysis program. Examples of measurement are shown when subjects seeing 3D display of image splitter method. Though many problems to be solved such as difficulty in calibration remain, this method will be useful for study of near triad because both apparatus and subject can be arranged relatively freely.