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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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Dementia l: Introduction

Dementia is an acquired, progressive syndrome characterized by a decline in multiple cognitive domains severe enough to impair daily functioning and reduce independence. Although memory loss is a central feature, the diagnosis requires additional deficits involving language, executive function, visuospatial skills, judgment, calculation, or abstract reasoning. These cognitive impairments reflect underlying neurodegenerative or vascular processes that gradually disrupt neuronal networks...
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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.
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Alzheimer's Disease: Overview

Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Prosopagnosia

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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
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Visual spatial cognition in neurodegenerative disease.

Katherine L Possin1

  • 1Department of Neurology, University of California, San Francisco, CA, USA. kpossin@memory.ucsf.edu

Neurocase
|June 8, 2010
PubMed
Summary

Visual spatial impairment is an early sign of neurodegenerative diseases. Anatomically-focused assessments of visual spatial cognition can aid in early diagnosis and differentiate between various neurodegenerative conditions.

Area of Science:

  • Neuroscience
  • Cognitive Neurology

Background:

  • Visual spatial impairment is a common early symptom in neurodegenerative diseases.
  • Current dementia evaluations often lack comprehensive assessment of visual spatial cognition.
  • Neurodegenerative diseases impact visual spatial abilities distinctively due to specific neural network atrophy.

Purpose of the Study:

  • To review the literature on visual spatial cognition in neurodegenerative disease clinical syndromes.
  • To explore how neuropathologic diagnoses correlate with visual spatial deficits.
  • To organize visual spatial cognition by processing schemes for diagnostic clarity.

Main Methods:

  • Literature review of visual spatial cognition in neurodegenerative diseases.
  • Organization of visual spatial cognition by bottom-up/top-down processing.

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  • Analysis based on dorsal/ventral stream processing and egocentric/allocentric frames of reference.

    • Main Results:

    • Different neurodegenerative diseases manifest characteristic patterns of visual spatial impairment.
    • Anatomically-focused assessments can reveal specific deficits linked to distinct neural pathologies.
    • The reviewed literature supports the utility of detailed visual spatial analysis for diagnosis.

    Conclusions:

    • Targeted assessment of visual spatial cognition is crucial for early and accurate diagnosis of neurodegenerative diseases.
    • Understanding the specific ways neurodegeneration affects visual spatial processing aids differential diagnosis.
    • Structuring visual spatial assessment by processing schemes and reference frames enhances clinical utility.