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Open AccessArticle

Evidence for Obliqueness of Angles as a Cue to Planar Surface Slant Found in Extremely Simple Symmetrical Shapes

Helmholtz Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
Symmetry 2015, 7(1), 241-254; https://doi.org/10.3390/sym7010241
Received: 17 November 2014 / Revised: 23 February 2015 / Accepted: 2 March 2015 / Published: 9 March 2015
(This article belongs to the Special Issue Symmetry: Theory and Applications in Vision)
The Necker cube is a striking example for perceptual dominance of 3D over 2D. Object symmetry and obliqueness of angles are co-varying cues that may underlie the perceived slant of Necker cubes. To investigate the power of the oblique-angle cue, slants were judged of extremely simple symmetrical shapes. Slant computations based on an assumption of orthogonality were made for two abutting lines as a function of vertex angle and the slant of the screen. Computed slants were compared with slants judged by six subjects under binocular viewing conditions. Judged slant was highly correlated with slant specified by the oblique angles under an assumption of orthogonality. The contributions of screen cues, including binocular disparity, were negligible. The consistency of the judgments across subjects indicates the assumption of orthogonality as one of the principles underlying slant perception. Necker cubes illustrate that the visual system can disengage unambiguous cues in favor of ambiguous object-symmetry and oblique-angle cues, if the latter indicate very different slants. Selective disengagement of cues may be the mechanism that underlies the success of 2D images in ancient, as well as modern civilizations. View Full-Text
Keywords: human vision; slant perception; image symmetry; object symmetry human vision; slant perception; image symmetry; object symmetry
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MDPI and ACS Style

Erkelens, C.J. Evidence for Obliqueness of Angles as a Cue to Planar Surface Slant Found in Extremely Simple Symmetrical Shapes. Symmetry 2015, 7, 241-254. https://doi.org/10.3390/sym7010241

AMA Style

Erkelens CJ. Evidence for Obliqueness of Angles as a Cue to Planar Surface Slant Found in Extremely Simple Symmetrical Shapes. Symmetry. 2015; 7(1):241-254. https://doi.org/10.3390/sym7010241

Chicago/Turabian Style

Erkelens, Casper J. 2015. "Evidence for Obliqueness of Angles as a Cue to Planar Surface Slant Found in Extremely Simple Symmetrical Shapes" Symmetry 7, no. 1: 241-254. https://doi.org/10.3390/sym7010241

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