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Visual Agnosia

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"...

Vision

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

Gestalt Principles of Perception

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...

Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

Prosopagnosia

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 Constancy

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...

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Related Experiment Video

Updated: Jul 17, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

Looking while imagining: the influence of visual input on representational neglect.

G Rode¹, P Revol, Y Rossetti

¹Université de Lyon, Université Lyon 1, Inserm UMR-S 534, Bron, France. gilles.rode@chu-lyon.fr

|February 7, 2007

Summary

Representational neglect in patients with hemispatial neglect may stem from an impaired ability to generate mental images, not just explore them. Blindfolding did not improve recall in neglect patients, suggesting a generation deficit.

More Related Videos

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

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

Published on: March 10, 2021

Related Experiment Videos

Last Updated: Jul 17, 2026

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

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

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

Published on: March 10, 2021

Area of Science:

Cognitive Neuroscience
Clinical Psychology
Neuropsychology

Background:

Hemispatial neglect often involves representational neglect, affecting recall from the left side of mental images.
This deficit may arise from impaired mental image generation or failure to explore a generated image.
External visual stimuli can exacerbate neglect by drawing attention to the right side.

Purpose of the Study:

To differentiate between impaired mental image generation and exploration in representational neglect.
To investigate the effect of blindfolding on mental image recall in patients with neglect.

Main Methods:

Eight normal participants and eight patients with left representational neglect imagined the map of France.
Participants named towns from the mental map within 2 minutes, with eyes open or blindfolded.
Performance was compared between conditions and groups.

Main Results:

Normal participants recalled more towns when blindfolded, indicating visual distraction.
Patients with representational neglect showed no significant difference in recall when blindfolded.
Blindfolding did not improve recall of left-sided details in neglect patients.

Conclusions:

Representational neglect might result from a deficit in generating the left side of mental images.
Findings suggest that the core issue in representational neglect is image formation, not exploration.