Saccade Mechanism Based on Processes for Depth Estimation and Incongruity Detection between Binocular Retinal Images

Analysis of Gazing Positions and Inter-saccade Intervals

Abstract

We analyzed binocular gazing positions in the existence of a rim occlusion. When a human gazes at the rim of a textured cylinder, the gazing position shifts from the fixation target. When a human gazes at the rim of a cylinder whose upper-surface is visible, the gazing points are located at the estimated surface's depth. In this paper, to investigate the mechanism changing the gazing point, we analyzed inter-saccade intervals. The result shows that an occlusion detection mechanism exists at an early stage of human visual processing, and the mechanism causes a shorter-interval saccade when incongruity regions between left and right retinal images are detected. We propose a saccade mechanism which includes processes for depth estimation and incongruity detection between binocular retinal images based on relationships between the gazing positions and the results of inter-saccade intervals.