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|Title: ||Angle illusion on a picture's surface|
|Authors: ||Hammad, Sherief|
Kennedy, John M.
|Issue Date: ||2008|
|Publisher: ||Brill Academic Publishers|
|Citation: ||Hammad, S., Kennedy, J. M., Juricevic, I., & Rajani, S. (2008). Angle illusion on a picture's surface. Spatial Vision, 21(3-5), 451-462.|
|Abstract: ||Shapes on picture surfaces are not seen accurately (Arnheim, 1954). In particular, if they depict 3-D forms, angles between lines on a picture surface are misperceived. To test four theories of the misperception, subjects estimated acute and obtuse internal angles of quadrilaterals. Each quadrilateral was shown alone or as part of a drawing of a cube. The drawings showed the tops of the cubes, tilted at various angles around a horizontal axis. This generated different acute and obtuse angles in the drawings. Compared to a quadrilateral on its own, judgments of the acute and obtuse angles in the cube drawings were biased towards 90°. The bias was present over a wide range of intermediate tilts. The results support a perspective convergence theory and run counter to 'Extreme Foreshortening', Gestalt and Cognitive theories.|
|Appears in Collections:||Kennedy, John M.|
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