The determination of perceived tridimensional orientation by minimum criteria

The hypothesis investigated is that the perceived tridimensional orientation of an object is determined, in monocular vision, by tendencies to make the perceived object as simple as possible. Line drawings seen as “boxes” were viewed by Os who judged the slant fangle with frontal plane) of various edges. For every such edge, there is a determinate hypothetical slant consistent with perfect homogeneity of values on one or more of three variables (angle, length, and slope) Perceived slant was highly predictable from hypothetical slant, though always with some regression to the frontal plane. Results add support to aPrägnanz or minimum-principle theory of space perception.