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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"...
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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.
Gestalt Principles of Perception01:21

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Perceptual Constancy

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Related Experiment Video

Updated: Jun 11, 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

The vertical-horizontal illusion in hemi-spatial neglect.

M de Montalembert1, P Mamassian

  • 1Laboratoire Psychologie de la Perception (CNRS UMR 8158), Université Paris Descartes, Paris, France. marie.de-montalembert@parisdescartes.fr

Neuropsychologia
|July 14, 2010
PubMed
Summary
This summary is machine-generated.

Patients with spatial neglect and right brain damage show an exaggerated vertical-horizontal illusion. Both anisotropy and bisection components of the illusion were significantly increased in these patient groups compared to controls.

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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Last Updated: Jun 11, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Published on: April 16, 2014

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • The vertical-horizontal illusion demonstrates systematic length misperception between orthogonal lines.
  • It comprises an anisotropy component (vertical appears longer) and a bisection component (bisected line appears shorter).
  • Spatial neglect, often resulting from right brain damage, affects spatial awareness and attention.

Purpose of the Study:

  • To investigate the impact of left hemi-neglect and right brain damage on the vertical-horizontal illusion.
  • To quantify changes in both anisotropy and bisection components of the illusion in patient groups.

Main Methods:

  • Comparison of six patients with left hemi-neglect (N-patients) and four right brain-damaged patients without neglect (RH-patients) against control participants.
  • Assessment of performance across various spatial configurations of the vertical-horizontal illusion.

Main Results:

  • Both N-patients and RH-patients exhibited increased anisotropy and bisection components of the vertical-horizontal illusion compared to controls.
  • Anisotropy component increased from 5% in controls to 11% (N-patients) and 10% (RH-patients).
  • Bisection component increased from 17% in controls to 22% (N-patients) and 20% (RH-patients).
  • A left-oriented horizontal-'T' figure produced significantly less bias than a right-oriented one.

Conclusions:

  • Right brain damage, with or without neglect, exacerbates the vertical-horizontal illusion.
  • Findings suggest a role for attentional disengagement and representation of stimuli in the neglected visual field.
  • The study highlights the influence of brain damage on fundamental aspects of visual perception and spatial processing.