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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"...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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.
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.
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...

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Related Experiment Video

Updated: May 8, 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

Parietal damage and narrow "spotlight" spatial attention.

J Townsend, E Courchesne

    Journal of Cognitive Neuroscience
    |August 23, 2013
    PubMed
    Summary
    This summary is machine-generated.

    Patients with parietal cortex damage exhibit a focused "spotlight" of visual attention. This leads to faster responses within the focus but delayed reactions to stimuli outside this narrow attentional beam.

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

    Published on: April 11, 2025

    Related Experiment Videos

    Last Updated: May 8, 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

    A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
    07:12

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

    Published on: April 11, 2025

    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neuroimaging

    Background:

    • Parietal cortex plays a crucial role in spatial attention.
    • Damage to the parietal lobe can result in attentional deficits.

    Purpose of the Study:

    • To investigate the nature of visual attention in patients with parietal volume loss.
    • To elucidate the functional consequences of parietal abnormalities on spatial attention mechanisms.

    Main Methods:

    • Compared electrophysiological and behavioral responses of patients with parietal volume loss to control subjects.
    • Utilized a focused spatial attention task assessing reaction times and event-related potentials (ERPs).
    • Analyzed P1 and P3b ERP components as indicators of sensory processing and attentional modulation.

    Main Results:

    • Patients with parietal abnormalities showed faster reaction times (RTs) to targets.
    • Earlier P3b event-related potential (ERP) latencies were observed in patients.
    • Enhanced P1 ERP attention effects indicated greater sensory response enhancement at attended locations.

    Conclusions:

    • Parietal cortex damage leads to a narrowed attentional focus, akin to a spotlight.
    • This dysfunctional attentional map impairs processing outside the focus, causing response delays.
    • Findings suggest a mechanism for spatial attention impairments following parietal damage.