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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"...
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.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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...
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,...
Positive Symptoms of Schizophrenia: Hallucinations and Delusions01:30

Positive Symptoms of Schizophrenia: Hallucinations and Delusions

Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes loosely...

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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

Disorders of visuospatial processing.

Anjan Chatterjee, H Branch Coslett

    Continuum (Minneapolis, Minn.)
    |July 20, 2012
    PubMed
    Summary
    This summary is machine-generated.

    This review covers visuospatial disorders like neglect, simultanagnosia, and optic ataxia. Understanding these processing impairments is crucial for diagnosing and managing conditions affecting brain function.

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

    Background:

    • Visuospatial function disorders are prevalent yet not fully understood.
    • These deficits significantly impact daily life and neurological assessment.
    • Identifying specific processing impairments is key to diagnosis.

    Purpose of the Study:

    • To review clinical symptoms, assessment methods, and processing impairments in visuospatial disorders.
    • To elucidate the underlying mechanisms of conditions where visuospatial processing is primary.
    • To highlight diagnostic approaches for less recognized visuospatial deficits.

    Main Methods:

    • Literature review of clinical symptoms and assessment techniques.
    • Analysis of processing impairments in specific visuospatial disorders.
    • Examination of visuospatial deficits in neurodegenerative diseases.

    Main Results:

    • Detailed description of neglect syndrome, characterized by contralesional inattention.
    • Explanation of simultanagnosia, the inability to perceive multiple objects simultaneously.
    • Identification of optic ataxia (misreaching) and its diagnostic markers.
    • Association of visuospatial disorders with early-stage Alzheimer disease and other dementias.

    Conclusions:

    • Visuospatial disorders encompass a range of conditions with distinct clinical presentations.
    • Accurate assessment and understanding of processing deficits are vital for patient care.
    • These disorders can be early indicators of significant neurological conditions, including Alzheimer disease.