Difference thresholds in 3D space depend on perceived size, not depth.

ABSTRACT: People typically perceive objects to be the same size and shape despite changes in viewing distance, a phenomenon known as object constancy. Recent work suggests that perceptual processing of object shape and size may be enhanced in near space, consistent with similar reports from attentional tasks. These studies, however, have some methodological limitations, as the viewing distance was manipulated using illusory 2D depth cues, for which perceptual processes may differ significantly from those in real three-dimensional (3D) environments. To address this, a series of psychophysical experiments were conducted in which participants' visual resolution for object length was tested within and outside their peripersonal space. In Experiments 1 and 2, difference thresholds (Just Noticeable Differ

SUBMITTER: Ozana A 

PROVIDER: S-EPMC12484268 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature