Eye torsion and visual tilt are mediated by different binocular processes

Abstract

Viewing a large, patterned field rotating about the line of sight produces two measurable effects: cyclotorsion of the eyes (torsion) and a perceived displacement of vertical and horizontal (tilt). Experiments examining binocular interaction for these effects show: (1) both effects demonstrate summation in normal individuals and thus both involve a binocular process: (2) the process for tilt is different than that for torsion, since summation for torsion is spared in stereodeficient individuals while that for tilt is eliminated.