Is vertical disparity used to determine azimuth?

The azimuth of a stimulus relative to the head can be determined from an extra-retinal, eye-position signal plus an estimate of the retinal eccentricity of the image. Alternatively, azimuth could be determined from retinal-image information alone. Specifically, stimulus azimuth could be estimated from two derivatives of vertical disparity: vertical size ratio (which varies with azimuth), and the horizontal gradient of vertical size ratio (a measure of distance). Here we examine the determinants of perceived azimuth in viewing conditions that, theoretically, should favor the use of vertical disparity. We find no evidence that vertical disparity is used. Perceived azimuth was determined completely by felt eye position and the retinal eccentricity of the image.

[1]  Bacon's Last Egg?—The Exploratory , 1982, Perception.

[2]  M. Banks,et al.  Estimator Reliability and Distance Scaling in Stereoscopic Slant Perception , 1999, Perception.

[3]  E. M. Berends,et al.  Depth perception and adaptation to disparity , 2001 .

[4]  James A. Crowell,et al.  Horizontal and vertical disparity, eye position, and stereoscopic slant perception , 1999, Vision Research.

[5]  J. Porrill,et al.  Stereopsis, vertical disparity and relief transformations , 1995, Vision Research.

[6]  M. Banks,et al.  Perceiving slant about a horizontal axis from stereopsis. , 2001, Journal of vision.

[7]  B Gillam,et al.  The role of vertical disparity in the scaling of stereoscopic depth perception: An empirical and theoretical study , 1988, Perception & psychophysics.

[8]  M F Bradshaw,et al.  Vertical disparities, differential perspective and binocular stereopsis , 1993, Nature.

[9]  B. Rogers,et al.  The effect of display size on disparity scaling from differential perspective and vergence cues , 1996, Vision Research.

[10]  Ian P. Howard,et al.  Binocular Vision and Stereopsis , 1996 .

[11]  Kenneth N. Ogle,et al.  INDUCED SIZE EFFECT: I. A NEW PHENOMENON IN BINOCULAR SPACE PERCEPTION ASSOCIATED WITH THE RELATIVE SIZES OF THE IMAGES OF THE TWO EYES , 1938 .

[12]  B. Gillam,et al.  The induced effect, vertical disparity, and stereoscopic theory , 1983, Perception & psychophysics.

[13]  J. E. W. Mayhew,et al.  Vertical disparity pooling and the induced effect , 1984, Nature.

[14]  M F Bradshaw,et al.  Disparity Scaling and the Perception of Frontoparallel Surfaces , 1995, Perception.

[15]  K. N. Ogle.  Researches in binocular vision. , 1950 .

[16]  John P. Frisby.  Vision: An old illusion and a new theory of stereoscopic depth perception , 1984, Nature.

[17]  Martin S. Banks,et al.  Extra-retinal and perspective cues cause the small range of the induced effect , 1998, Vision Research.

[18]  H. C. Longuet-Higgins.  The Role of the Vertical Dimension in Stereoscopic Vision , 1982, Perception.