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Related Concept Videos

Visual Agnosia01:12

Visual 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"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
Perceptual Constancy01:12

Perceptual 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...
Depth Perception and Spatial Vision01:15

Depth 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.
Color Vision01:24

Color 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.
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Related Experiment Video

Updated: Jul 5, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
07:04

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

Published on: March 10, 2021

Seeing and imagining the "same" objects in unilateral neglect.

Clémence Bourlon1, Pascale Pradat-Diehl, Christophe Duret

  • 1INSERM UMR_S 610, IFR 70, Pavillon Claude Bernard, Hôpital Pitié-Salpêtrière, 47 bd de l'Hôpital, 75013 Paris, France. c.bourlon@gmail.com

Neuropsychologia
|May 20, 2008
PubMed
Summary
This summary is machine-generated.

Imaginal neglect is rare and often linked to perceptual neglect. This study used comparable tasks to show perceptual neglect is more common and severe, aligning with attention biases.

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How to Create and Use Binocular Rivalry
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How to Create and Use Binocular Rivalry

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Last Updated: Jul 5, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Published on: March 10, 2021

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Published on: November 10, 2010

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Perceptual and imaginal neglect are typically studied using dissimilar tasks.
  • Investigating neglect requires comparable tasks across modalities.

Purpose of the Study:

  • To compare perceptual and imaginal neglect using identical stimuli and procedures.
  • To determine the frequency and severity of imaginal neglect relative to perceptual neglect.

Main Methods:

  • Participants performed perceptual (visual) and imaginal (auditory) tasks with identical stimuli (French towns/regions).
  • Tasks involved identifying the left or right side of stimuli relative to Paris.
  • Performance was assessed on single-case and group levels.

Main Results:

  • Patients showed group-level deficits in both perceptual and imaginal neglect.
  • Only one patient exhibited asymmetrical imaginal accuracy, co-occurring with perceptual neglect.
  • Perceptual neglect was more frequent and severe than imaginal neglect.

Conclusions:

  • Imaginal neglect is relatively rare and typically associated with perceptual neglect.
  • Perceptual neglect is more prevalent and severe, supporting theories of exogenous orienting bias.