Spatial Disorientation Practice Test

Size constancy describes perceiving an object as the same size even as its distance changes and its image on the retina grows or shrinks. In flight, you rely on visual cues to judge distance to landmarks or the runway. When your viewpoint shifts—approaching a feature, changing altitude, or looking from different angles—the retinal image can get larger or smaller, but your brain’s size-constancy tendency keeps the perceived size steady. That adjustment can distort distance perception, creating a size-distance illusion. Shape constancy deals with recognizing shape despite changes in viewpoint, aerial perspective is a depth cue from atmospheric effects, and depth perception is the general ability to judge three-dimensional relationships; none of these capture the specific size-distance illusion described by size constancy.