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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"...
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...
Classification of Illness01:17

Classification of Illness

The meaning of illness is individualized to each person who experiences an alteration in health. In contrast, disease is a medical term indicating a pathological change in the structure and function of the body or mind. It is a condition that has specific symptoms and boundaries.
An illness is a response to a disease in which the person's level of functioning is changed compared with a previous level. The general classification of illness includes acute and chronic.
Acute illness is severe and...
Learning Disabilities01:25

Learning Disabilities

Learning disabilities are cognitive disorders caused by neurological impairments that affect cognitive functions like language and reading, without indicating overall intellectual or developmental challenges. These disabilities differ from global intellectual or developmental disabilities as they are limited to distinct cognitive functions. Common learning disabilities include dysgraphia, dyslexia, and dyscalculia, each of which impacts unique aspects of learning.
Dyslexia
Dyslexia is a...
Seizures: Classification01:13

Seizures: Classification

Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
Diagnostic and Statistical Manual of Mental Disorders (DSM)01:27

Diagnostic and Statistical Manual of Mental Disorders (DSM)

The Diagnostic and Statistical Manual of Mental Disorders (DSM) serves as the primary classification system for mental health disorders, providing standardized diagnostic criteria for clinicians and researchers. First published by the American Psychiatric Association (APA) in 1952, the DSM has undergone several revisions to reflect evolving psychiatric understanding. The fifth edition, DSM-5, released in 2013, introduced key updates that expanded diagnostic categories and modified diagnostic...

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Related Experiment Video

Updated: May 21, 2026

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

Visual form-processing deficits: a global clinical classification.

J Unzueta-Arce1, R García-García1, V Ladera-Fernández1

  • 1Departamento de Psicología Básica, Psicobiología y Metodología de las Ciencias del Comportamiento, Universidad de Salamanca, Salamanca, España.

Neurologia (Barcelona, Spain)
|June 2, 2012
PubMed
Summary
This summary is machine-generated.

Visual agnosia encompasses various deficits in cortical visual processing. This study reviews clinical cases and proposes a diagnostic guide for these complex visual form processing disorders.

Keywords:
Agnosia asociativaAgnosia de integraciónAgnosia espacial de transformaciónAgnosia visual de formasAssociative agnosiaClasificación de agnosia visual de formasClassification of visual form agnosiaIntegrative agnosiaPseudo-agnosiaSeudoagnosia visualTransformational agnosiaVisual form agnosia

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Visual agnosia is a condition where patients struggle to recognize visual stimuli.
  • Recent research reveals distinct clinical forms of visual agnosia, indicating diverse deficits in cortical visual processing.

Purpose of the Study:

  • To provide a comprehensive overview of visual form processing deficits.
  • To establish criteria for evaluating abnormal visual processing.
  • To propose a diagnostic framework for visual agnosia.

Main Methods:

  • Literature review of clinical cases and classification proposals.
  • Analysis of neuroanatomical bases for visual form processing.
  • Development of a diagnostic decision tree for visual agnosia.

Main Results:

  • Identification of discrete diagnostic entities within visual agnosia.
  • Presentation of a diagram illustrating various visual form processing deficits.
  • Proposal of a boosted decision tree to aid diagnosis.

Conclusions:

  • While core cortical areas for visual processing are known, advanced neuroimaging will offer deeper insights.
  • Comprehensive assessment of visual processing stages is crucial for prognosis.
  • Personalized rehabilitation strategies can be developed based on detailed diagnostic evaluations.