Why are angles misperceived?

Although it has long been apparent that observers tend to overestimate the magnitude of acute angles and underestimate obtuse ones, there is no consensus about why such distortions are seen. Geometrical modeling combined with psychophysical testing of human subjects indicates that these misperceptions are the result of an empirical strategy that resolves the inherent ambiguity of angular stimuli by generating percepts of the past significance of the stimulus rather than the geometry of its retinal projection.

[1]  A. Linksz.  Outlines of a Theory of the Light Sense. , 1965 .

[2]  D Purves,et al.  An Empirical Explanation of the Cornsweet Effect , 1999, The Journal of Neuroscience.

[3]  D Purves,et al.  An empirical basis for Mach bands. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[4]  G. K. Wallace.  The critical distance of interaction in the Zöllner illusion , 1969 .

[5]  B. Gillam,et al.  Perception and Cognition at Century''s End , 1998 .

[6]  H. Helmholtz.  Helmholtz's Treatise on Physiological Optics , 1963 .

[7]  R. Gregory,et al.  Eye and Brain: The Psychology of Seeing , 1969 .

[8]  R. Gregory.  Eye and Brain: The Psychology of Seeing , 1966 .

[9]  H. Bouma,et al.  Perceived orientation of isolated line segments. , 1968, Vision research.

[10]  Illusion of Length in Acute- and Obtuse-Angle Figures , 1994, Perceptual and motor skills.

[11]  D Purves,et al.  An empirical explanation of brightness. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[12]  E. Greene,et al.  Collinearity Judgment as a Function of Induction Angle , 1994, Perceptual and motor skills.

[13]  D Purves,et al.  The distribution of oriented contours in the real world. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[14]  R. Gregory,et al.  Distortion of Visual Space as Inappropriate Constancy Scaling , 1963, Nature.

[15]  D. Purves,et al.  The influence of depicted illumination on brightness. , 1998, Proceedings of the National Academy of Sciences of the United States of America.

[16]  S. Heywood,et al.  Expanding Angles? Systematic Distortions of Space Involving Angular Figures , 1977, Perception.

[17]  W J Cody,et al.  Perception of Relative Velocity: A Revision of the Hypothesis of Relational Determination , 1980, Perception.

[18]  M. Luckiesh.  Visual Illusions: their Causes, Characteristics, and Applications , 1923, Nature.

[19]  Julian Hochberg,et al.  Perception and cognition at century's end , 1998 .

[20]  H. Bouma,et al.  Induced changes in the perceived orientation of line segments. , 1970, Vision research.

[21]  B. Stacey,et al.  Judgment of angle size: An experimental appraisal , 1971 .

[22]  G. H. Fisher.  An Experimental Study of Angular Subtension , 1969, The Quarterly journal of experimental psychology.

[23]  C. Blakemore,et al.  Lateral Inhibition between Orientation Detectors in the Human Visual System , 1970, Nature.

[24]  M. Lévesque.  Perception , 1986, The Yale Journal of Biology and Medicine.

[25]  D. Purves,et al.  The effects of color on brightness , 1999, Nature Neuroscience.

[26]  D. Purves,et al.  Mach bands as empirically derived associations. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[27]  J. Nelson,et al.  Orientation-selective inhibition from beyond the classic visual receptive field , 1978, Brain Research.

[28]  W. Hotopf,et al.  The regression to right angles tendency, lateral inhibition, and the transversals in the Zöllner and Poggendorff illusions , 1975 .

[29]  D. P. Andrews.  Perception of contour orientation in the central fovea part I: Short lines , 1967 .