Visual Information Processing at the Blind Spot

Abstract

The perceptual completion at the blind spot was studied by presenting test patterns around the blind area of 3 subjects with normal acuity, and conditions generating the perceptual completion were investigated. To be filled in, a stimulus must fall on at least two quadrants around the blind spot. Both a region between 3.0 and 3.9° in radii around the blind spot, which can generate white homogeneous completion, and the region between 4.3 and 5.2°, which can not generate any completion solely, play important parts in provoking completion. Periodic stimuli were more effective than non-periodic ones.