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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Prosopagnosia01:24

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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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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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,...
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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,...
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Vision01:24

Vision

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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.
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Visual System01:26

Visual System

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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.
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Related Experiment Video

Updated: Nov 9, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings

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Object recognition and visual object agnosia.

Christian Gerlach1, Ro Julia Robotham2

  • 1Department of Psychology, University of Southern Denmark, Odense, Denmark.

Handbook of Clinical Neurology
|April 9, 2021
PubMed
Summary
This summary is machine-generated.

Visual agnosia encompasses recognition disorders specific to vision, excluding sensory or general cognitive deficits. Understanding its types and assessment is key for tailored interventions.

Keywords:
AssessmentCategory specificityVisual agnosiaVisual disordersVisual object recognition

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Visual agnosia involves deficits in visual recognition not caused by sensory impairments or general intellectual decline.
  • It affects object recognition within the visual modality, impacting daily life significantly.

Purpose of the Study:

  • To detail various types of visual agnosia and related disorders.
  • To connect these impairments to current models of visual object recognition.
  • To propose a structured approach for assessment and intervention.

Main Methods:

  • Review and categorization of reported visual agnosia subtypes (e.g., form, integrative, associative, alexia, prosopagnosia).
  • Discussion of related visual perceptual impairments (e.g., simultanagnosia, aphantasia).
  • Proposal of a clinical assessment strategy following a posterior-to-anterior gradient.

Main Results:

  • Identification of distinct visual agnosia types and their relationship to visual processing pathways.
  • Highlighting the severe consequences of these impairments for affected individuals.
  • A proposed step-by-step assessment method from perceptual to memory-based processes.

Conclusions:

  • Visual agnosia comprises a spectrum of recognition disorders impacting visual processing.
  • Comprehensive assessment is crucial for diagnosing specific subtypes and their extent.
  • Tailored interventions based on detailed assessment can improve outcomes for patients.