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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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Lateralization01:28

Lateralization

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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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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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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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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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Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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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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Related Experiment Video

Updated: Mar 31, 2026

Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection
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Virtual Reality Tools for Assessing Unilateral Spatial Neglect: A Novel Opportunity for Data Collection

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A lateralized top-down network for visuospatial attention and neglect.

Jiaojian Wang1, Yanghua Tian2, Mengzhu Wang1

  • 1Key Laboratory for NeuroInformation of the Ministry of Education, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 625014, China.

Brain Imaging and Behavior
|October 29, 2015
PubMed
Summary
This summary is machine-generated.

Asymmetric top-down connectivity in the brain, particularly between the superior parietal lobule and V1, influences visuospatial attention. This imbalance may explain conditions like visuospatial neglect.

Keywords:
NeglectSuperior parietal lobuleTMSVisual cortexVisuospatial attention

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Visuospatial attention lateralization is linked to interhemispheric fronto-parietal network interactions.
  • Top-down attention's neural signatures are known, but its link to asymmetric attention is understudied.

Purpose of the Study:

  • To investigate the relationship between top-down functional connectivity and asymmetric visuospatial ability.
  • To model virtual lesions using rTMS and identify behavior-related connectivities via RSFC.

Main Methods:

  • Repetitive transcranial magnetic stimulation (rTMS) to assess behavioral performance in visuospatial attention shifting.
  • Resting-state functional connectivity (RSFC) analyses to identify behavior-related top-down functional connectivities.
  • Investigation of top-down connectivity in neglect patients to validate RSFC findings.

Main Results:

  • RSFC analyses in healthy subjects and neglect patients showed a strong link between asymmetric visuospatial ability/neglect and biased top-down connectivity between the posterior superior parietal lobule (SPL) and V1.
  • Stronger top-down connectivity correlated with greater dominance over the corresponding visual field.

Conclusions:

  • Asymmetric top-down networks may underlie the functional asymmetry of visuospatial attention.
  • Interhemispheric imbalance in these networks could contribute to visuospatial neglect.