Anisotropies in Stereo Depth Thresholds of Spatial Patterns and the Stereo Aperture Problem
Davis, Elizabeth Thorpe
King, Robert A.
Guenter, Brian K.
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Does a pattern's orientation affect stereoacuity? Do vertical disparities play a role in stereopsis? Furthermore, is retinal disparity encoded by changes in spatial position or spatial phase? The latter implies a "stereo aperture problem" -- only disparities perpendicular to the pattern's orientation are encoded. We found stereoacuities are worse for oblique patterns than for vertical patterns, but are worse for horizontal patterns. Moreover, for oblique patterns (unlike vertical or horizontal patterns), vertical disparity can be as effective as horizontal disparity. Results for vertical and oblique patterns suggest spatial phase encoding of disparity. In contrast, results for horizontal patterns suggest spatial postition encoding of disparity.