Fusional information processing

In binocular vision, owing to the geometrical perspective, the visual scene gives rise to two slightly different retinal images. The fusional mechanism is responsible for the unification of these retinal images to provide a single binocular image. The objective of this study is to investigate what strategy the fusional mechanism uses to unify the two retinal images. The results demonstrate that sensory fusional compensation is not strictly local. The presence of sensory compensation in one retinal region affects the sensory representation of neighboring regions. It is indicative of the extent of sensory spatial interactions that sensory compensation at a 2 degrees peripheral location can significantly affect the perceived position of centrally located nonius lines. Unlike motor compensation, sensory compensation affects fusible and nonfusible contours differently. >