title: Does Changing Vertical Disparity Induce Horizontal Head Movement?
abstract: Theoretically, one can estimate the direction of an object that is relative to the head using vertical disparity if the distance from the head to the object is known. However, several reports describe vertical disparity as having little or no effect on the perception of visual direction. It has been suggested, however, that the visual processes involved in action are different from those involved in perception, and the effect of visual disparity on action has not been investigated in previous studies. This study investigated the influence of vertical disparity on the stability of head direction as a motor response to visual information. We presented a stimulus consisting of horizontal lines with vertical size-disparity oscillation, and examined whether the stimulus affected the subject's head movement. The results showed that the head movement in the condition of vertical size-disparity oscillation was not significantly different from that in the condition of no disparity oscillation. Our results suggest that, despite theoretical validity, vertical disparity is not used for controlling head movement.
authors.affiliation: Center for Information and Neural Networks, National Institute of Information and Communication Technology, Suita, Osaka, Japan; Department of Information Processing, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Maekawa
authors.affiliation: Department of Information Processing, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Yokohama, Kanagawa, Japan.
authors.forename: Hirohiko
authors.initials: H
authors.lastname: Kaneko
mesh_terms: D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005583:Fourier Analysis; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D008297:Male; D015357:Vision Disparity / Q000502:physiology*