@incollection{allison2007203-203,
	abstract = {Horizontal-disparity processing in the presence of vertical misalignment: The role of monoptic depth

K Fukuda, L M Wilcox, R S Allison, I P Howard

Depth perception from stereopsis is thought to be resilient to vertical misalignments of up to $4^{\circ}$ (Ogle, 1955 Archives of Ophthalmology 53 495 ff; Mitchell, 1970 Vision Research 10 145 - 162). We have replicated these results, and assessed the assumption that horizontal disparity is responsible for depth in such stimuli. A horizontal line, which extended the width of the display, was inserted between the vertically misaligned horizontally disparate targets. Surprisingly, this had no effect on depth-discrimination performance. We repeated the study with only one half-image (a monoptic target) and the central line. Depth discrimination was above chance for all observers, suggesting that previous results were not due to horizontal disparity, but to the retinal position of the stimuli (Kaye, 1978 Vision Research 18 1013 - 1022; Wilcox et al, 2007 Vision Research 47 in press). Tolerance to vertical misalignment has been used as evidence against an epipolar constraint in human stereopsis; the presence of monoptic depth cues in such stimuli suggests that the issue is unresolved.
[Supported by Natural Sciences and Engineering Research Council of Canada and CIHR Training Grant in Vision Health Research.] },
	author = {Fukuda, K. and Wilcox, L. M. and Allison, R.S. and Howard, I. P.},
	booktitle = {Perception},
	date-modified = {2011-09-12 22:04:42 -0400},
	journal = {Perception},
	keywords = {Depth perception},
	pages = {203-203},
	title = {Horizontal-disparity processing in the presence of vertical misalignment: The role of monoptic depth},
	url-1 = {https://percept.eecs.yorku.ca/papers/fukuda ECVP 2007.doc},
	url-2 = {http://www.perceptionweb.com/abstract.cgi?id=v070330},
	volume = {36},
	year = {2007}}

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A horizontal line, which extended the width of the display, was inserted between the vertically misaligned horizontally disparate targets. Surprisingly, this had no effect on depth-discrimination performance. We repeated the study with only one half-image (a monoptic target) and the central line. Depth discrimination was above chance for all observers, suggesting that previous results were not due to horizontal disparity, but to the retinal position of the stimuli (Kaye, 1978 Vision Research 18 1013 - 1022; Wilcox et al, 2007 Vision Research 47 in press). Tolerance to vertical misalignment has been used as evidence against an epipolar constraint in human stereopsis; the presence of monoptic depth cues in such stimuli suggests that the issue is unresolved. 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We have replicated these results, and assessed the assumption that horizontal disparity is responsible for depth in such stimuli. A horizontal line, which extended the width of the display, was inserted between the vertically misaligned horizontally disparate targets. Surprisingly, this had no effect on depth-discrimination performance. We repeated the study with only one half-image (a monoptic target) and the central line. Depth discrimination was above chance for all observers, suggesting that previous results were not due to horizontal disparity, but to the retinal position of the stimuli (Kaye, 1978 Vision Research 18 1013 - 1022; Wilcox et al, 2007 Vision Research 47 in press). Tolerance to vertical misalignment has been used as evidence against an epipolar constraint in human stereopsis; the presence of monoptic depth cues in such stimuli suggests that the issue is unresolved.\n[Supported by Natural Sciences and Engineering Research Council of Canada and CIHR Training Grant in Vision Health Research.] },\n\tauthor = {Fukuda, K. and Wilcox, L. M. and Allison, R.S. and Howard, I. P.},\n\tbooktitle = {Perception},\n\tdate-modified = {2011-09-12 22:04:42 -0400},\n\tjournal = {Perception},\n\tkeywords = {Depth perception},\n\tpages = {203-203},\n\ttitle = {Horizontal-disparity processing in the presence of vertical misalignment: The role of monoptic depth},\n\turl-1 = {https://percept.eecs.yorku.ca/papers/fukuda ECVP 2007.doc},\n\turl-2 = {http://www.perceptionweb.com/abstract.cgi?id=v070330},\n\tvolume = {36},\n\tyear = {2007}}\n\n","author_short":["Fukuda, K.","Wilcox, L. M.","Allison, R.","Howard, I. 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