Related Experiment Video
Updated: May 17, 2026
08:04
Measuring Sensitivity to Viewpoint Change with and without Stereoscopic Cues
Published on: December 4, 2013
da Vinci decoded: does da Vinci stereopsis rely on disparity?
Inna Tsirlin1, Laurie M Wilcox, Robert S Allison
1Centre for Vision Research, Department of Psychology, York University, Toronto, Ontario, Canada. itsirlin@yorku.ca
Journal of Vision
|November 3, 2012
Summary
Da Vinci stereopsis allows depth perception even when objects are occluded. This study confirms occlusion geometry, not conventional disparity, is the primary source of this depth perception.
Area of Science:
- Vision science
- Computational neuroscience
- Psychophysics
Background:
- Conventional stereopsis relies on retinal disparity for depth perception.
- Occlusion can prevent disparity computation for monocularly visible objects.
- Da Vinci stereopsis describes depth perception from occlusion geometry.
Purpose of the Study:
- Investigate the source of depth perception in Nakayama and Shimojo's (1990) stimuli.
- Determine if Da Vinci stereopsis relies on a single mechanism or is stimulus-dependent.
- Clarify the role of occlusion geometry versus conventional disparity.
Main Methods:
- Psychophysical experiments
- Computational modeling
- Analysis of stimuli used by Nakayama and Shimojo (1990)
Main Results:
- Depth perception in the studied stimuli primarily originates from occlusion geometry.
- Evidence supports occlusion geometry as the source of Da Vinci stereopsis.
- Contradicts previous suggestions of conventional disparity being the sole mechanism.
Conclusions:
- Occlusion geometry is a key factor in Da Vinci stereopsis.
- Depth processing from monocular features is crucial for this phenomenon.
- Further research into specific neural mechanisms is warranted.
Related Concept Videos
01:15Depth Perception and Spatial Vision
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
01:24Color Vision
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
01:12Perceptual Constancy
Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
01:12Visual Agnosia
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...
01:26Causes of Similarity-Dissimilarity Effect
The similarity-dissimilarity effect, a fundamental concept in social psychology, explains how interpersonal similarities and differences influence attraction and social interactions. This effect is supported by three key psychological perspectives: balance theory, social comparison theory, and consensual validation.Balance Theory and Cognitive ConsistencyBalance theory, developed by Fritz Heider, posits that individuals seek cognitive consistency in their relationships. When two people share...
02:32Stereoisomers
On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...