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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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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:
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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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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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Related Experiment Video

Updated: Nov 26, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Midlevel visual deficits after strokes involving area human V4.

Karoline Spang1, Cathleen Grimsen1, Maren Prass1

  • 1Department of Human Neurobiology, University of Bremen, Bremen, Germany.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 8, 2020
PubMed
Summary

Many stroke patients have undetected midlevel vision deficits affecting motion, color, and texture perception. Lesions in human V4 (hV4) and lingual gyrus correlate with these visual impairments, revealing distinct processing networks.

Keywords:
Human V4Midlevel visionPatient studyVisual deficitVoxel-based lesion-symptom mapping

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Clinical Neurology

Background:

  • Standard clinical tests often miss subtle midlevel visual deficits in stroke patients.
  • Midlevel vision encompasses processing of form, motion, color, and texture.

Purpose of the Study:

  • To investigate the prevalence and nature of undetected midlevel visual deficits in stroke survivors.
  • To identify the neural correlates of these deficits using voxel-based lesion-symptom mapping (VLSM).
  • To elucidate the functional organization of midlevel visual processing areas.

Main Methods:

  • Recruited 51 stroke patients with clear central visual fields.
  • Assessed detection and discrimination thresholds for motion, color, and texture-defined forms.
  • Utilized voxel-based lesion-symptom mapping (VLSM) to correlate lesion locations with visual deficits.

Main Results:

  • Approximately half of the patients exhibited significant, undetected deficits in midlevel vision.
  • Lesions primarily involved the human V4 (hV4) area and adjacent lingual gyrus.
  • Weak correlations in detection thresholds suggest partly separate neural networks for color, motion, and texture.
  • Stronger correlations in form discrimination suggest shared mechanisms across visual submodalities.

Conclusions:

  • Visual perception deficits are more common post-stroke than clinically apparent.
  • The human V4 (hV4) and lingual gyrus are critical for midlevel visual processing.
  • Midlevel visual processing involves both specialized and shared neural mechanisms.