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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

Prosopagnosia

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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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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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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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Motor and Sensory Areas of the Cortex01:14

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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Related Experiment Video

Updated: May 2, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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When apperceptive agnosia is explained by a deficit of primary visual processing.

Andrea Serino1, Roberto Cecere1, Neil Dundon1

  • 1CsrNC, Centro studi e ricerche in Neuroscienze Cognitive, Polo Scientifico-Didattico di Cesena, ALMA MATER STUDIORUM - Università di Bologna, Italy; Dipartimento di Psicologia, ALMA MATER STUDIORUM - Università di Bologna, Italy.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Visual agnosia, a shape recognition deficit, may stem from basic visual processing issues, not just high-level ones. This case study highlights impaired line orientation processing as a key factor in visual agnosia.

Keywords:
Cortical blindnessCrowding effectOrientation discrimination deficitVisual agnosia

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Background:

  • Visual agnosia impairs recognition of shapes, objects, faces, and letters.
  • Typically linked to high-order visual system lesions.
  • Previous cases often had visual field defects and poor primary visual processing.

Purpose of the Study:

  • Investigate if form agnosia can result from deficits in basic visual functions.
  • Differentiate from deficits in high-order shape recognition.

Main Methods:

  • Case study of patient SDV with bilateral occipital cortex lesion.
  • Assessed visual functions including visual field, color, motion, and spatial acuity.
  • Conducted psychophysical experiments to evaluate recognition deficits.

Main Results:

  • SDV had central visual field blindness but preserved color and motion perception.
  • Recognition deficits were not due to poor spatial acuity or crowding.
  • A severe deficit in line orientation processing was identified as a key mechanism.

Conclusions:

  • Some visual agnosia forms may arise from basic visual function deficits.
  • Widespread primary visual area lesions can impact early visual processing.
  • Impaired line orientation processing is a potential cause of visual agnosia.