Masahiro ISHII

Graduate School of Science and Engineering, University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan

(Received November 20, 2008; Revised April 15, 2009; Accepted April 26, 2009)

The slant from horizontal size disparity is geometrically predictable. The apparent slant, however, is usually not equivalent to the prediction as numerous visual factors affect it. The aim of this study is to examine whether the vertical angular subtense of a stimulus with horizontal size disparity alters the magnitude of perceived slant for a given horizontal angular subtense. The results indicate that a smaller angular subtense of display produces a smaller magnitude of slant perception.

Key words: stereopsis, horizontal size disparity, disparity gradient, angular subtense