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Related Concept Videos

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
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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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Vision01:24

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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 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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Somatosensory, Motor, and Association Cortex01:24

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
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The striate cortex and hemianopia.

Semir Zeki1, Alexander Leff2

  • 1Department of Cell and Developmental Biology, University College London, London, United Kingdom.

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

The striate cortex (V1) is not the sole or earliest visual signal recipient and isn't essential for conscious vision. Damage to V1 causes visual field defects, with central vision being overrepresented.

Keywords:
BlindsightCortical magnification factorHemianopiaRiddoch syndromeStriate cortexStrokeVisual motion

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Area of Science:

  • Neuroscience
  • Visual Neuroscience
  • Cortical Function

Background:

  • The striate cortex, or V1, has long been considered the primary visual processing center.
  • Recent clinical and anatomical studies challenge traditional views of V1's role in vision.

Purpose of the Study:

  • To review the functions of the striate cortex (V1).
  • To examine the effects of damage to V1 and its inputs, leading to homonymous hemifield defects.
  • To discuss the evolving understanding of V1's necessity for conscious vision and visual signal processing.

Main Methods:

  • Review of clinical and anatomical studies from the past 25 years.
  • Analysis of visual field representation in the striate cortex.
  • Case studies of visual field disturbances from retrochiasmal visual system damage.

Main Results:

  • Evidence suggests V1 is not the sole or earliest recipient of visual signals.
  • V1 is not essential for conscious vision.
  • The central visual field is overrepresented in human striate cortex.
  • Damage to V1 or its inputs results in predictable visual field defects.

Conclusions:

  • The role of V1 in vision is more complex than previously thought.
  • Alternative pathways and processing centers contribute to visual perception.
  • Understanding V1's function and the impact of its damage is crucial for diagnosing and treating visual field defects.