A binocular parallax theory of the geometric illusions

Abstract

A new theory of the geometric illusions is presented. Three perceptual processes are described, tending to reduce binocular parallax anomalies for environments containing overlaid objects. Inappropriate operation of these processes gives rise to the illusions. The effects of environmental training on the illusions are considered. Results from cross-cultural studies are cited and used to test a prediction from the theory concerning the magnitudes of cross-cultural differences for two forms of the vertical-horizontal illusion.