Slant or occlusion: global factors resolve stereoscopic ambiguity in sets of horizontal lines

Vision Research
Barbara J Gillam, Philip M Grove

Abstract

Perceived slant was measured for horizontal lines aligned on one side and of varying lengths whose length disparity was either a constant linear amount for all lines (consistent with uniocular occlusion) or proportional to line length (consistent with global slant). Although the disparity of any line was ambiguous with respect to these two possibilities, slant of individual lines did not occur in the former case, but a subjective contour in depth was reported along the alignment. For proportional disparity of the set, global slant was seen. Adding a constant length to each line on the invalid eye for occlusion resulted in multiple slants. Smooth uniocular variations in alignment shape elicited subjective contours slanting or curving in depth. Global context can disambiguate the depth status of individual disparate lines.

References

Sep 4, 1992·Science·K Nakayama, S Shimojo
Jan 27, 1994·Nature·B L Anderson
Jan 1, 1997·Spatial Vision·D H Brainard
Jan 1, 1997·Perception·J Häkkinen, G Nyman
Mar 3, 2004·Perception·Philip M GroveHirohiko Kaneko

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Citations

Aug 30, 2006·Vision Research·Philip M GroveBarbara J Gillam
Aug 2, 2005·Vision Research·K R Brooks, B J Gillam
Apr 23, 2009·Vision Research·Katinka van der Kooij, Susan F te Pas
Jun 10, 2011·Vision Research·Inna TsirlinRobert S Allison
Jul 7, 2009·Vision Research·Julie M Harris, Laurie M Wilcox

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