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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

1.8K
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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Somatosensation01:33

Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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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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Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
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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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Related Experiment Video

Updated: Apr 10, 2026

Assessment of Spatial Lingual Tactile Sensitivity using a Gratings Orientation Test
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[Visual Texture Agnosia in Humans].

Kyoko Suzuki1

  • 1Department of Clinical Neuroscience, Yamagata University Graduate School of Medicine.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|June 12, 2015
PubMed
Summary

Visual texture agnosia is a newly identified condition where individuals cannot recognize objects by their texture. This study presents two cases, highlighting separate brain pathways for processing texture versus shape.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Ophthalmology

Context:

  • Visual object recognition relies on processing both geometric and surface properties.
  • Visual agnosia, typically linked to geometric features, impairs object identification.
  • A distinct deficit in recognizing objects by texture, termed visual texture agnosia, is proposed.

Purpose:

  • To present and analyze two cases of visual texture agnosia.
  • To investigate the neural basis of texture recognition.
  • To explore the dissociation between texture and geometric feature processing in vision.

Summary:

  • Two patients with visual texture agnosia due to occipitotemporal cortex damage are described.
  • Case 1 exhibited texture agnosia but preserved contour-based object recognition.

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  • Case 2 showed impaired texture recognition in 2D images, with intact contour processing.

    • Impact:

    • Findings suggest distinct neural pathways for processing texture, color, and geometric visual features.
    • The left collateral sulcus region is identified as critical for visual texture processing.
    • This research advances understanding of the specialized mechanisms underlying visual perception.