Effect of Binocular Disparity on Head Pointing

Abstract

Theoretically, we can estimate the direction of an object from vertical disparity produced by the object, if the distance to the object is known. Several studies, however, suggested that vertical disparity had little or no effect on the perception of visual direction. Hence we examine whether vertical and horizontal disparity is used for head pointing, one of the body control or action tasks using the information of visual direction. Subject turned their head to a pointing target, and head movement was measured during the task. We manipulated vertical and horizontal disparity cue by using a stereo display with real time control. The results suggest that the vertical and horizontal disparity affected the goal of head pointing.