| Abstract: | Reviews the literature about the nonaccidental properties (NAPs) cotermination, straightness, and parallelism to trace their historical roots, to list the properties that function as NAPs, and to discuss the psychological evidence for their detection and use. Four experiments are reviewed, and four are fully described that were designed to test the perceptual use of skewed symmetry, which results from orthographic projection of planar bilateral or mirror symmetry. Despite the large symmetry advantage obtained in all experiments, skewed symmetry is only perceived as bilateral symmetry-in-depth in cases of closed polygons or dot patterns with higher-order types of symmetry. (French abstract) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
