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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"...
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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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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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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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Photoreceptors and Visual Pathways

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, whereas...
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Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Dominance specific visual extinction associated with callosal disconnection.

J I Lee1, J H Kim, B H Lee

  • 1Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Kangnam-gu, Seoul, South Korea.

Neurocase
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

Visual extinction, typically linked to right-sided brain damage, can occur after corpus callosum lesions. A case study suggests this visual deficit may indicate specific disconnection signs following a splenial lesion.

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Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Neuropsychology

Background:

  • Callosal disconnection signs are linked to asymmetric hemispheric specialization of cognitive functions.
  • Visual extinction is commonly associated with right parietotemporal lesions but can follow corpus callosum damage.

Observation:

  • A 58-year-old right-handed man experienced an infarction involving the left splenium of the corpus callosum.
  • The patient did not exhibit previously reported disconnection symptoms.

Findings:

  • The patient presented with visual extinction, showing dominance with either left or right visual hemifield stimuli.
  • This suggests that dominance-specific visual extinction may be a novel disconnection sign.

Implications:

  • Splenial lesions of the corpus callosum can lead to specific patterns of visual extinction.
  • This finding expands the understanding of callosal disconnection syndromes and their impact on visual processing.