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Related Concept Videos

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

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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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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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Related Experiment Video

Updated: Sep 8, 2025

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Hemispheric functional segregation facilitates target detection during sustained visuospatial attention.

Mauro DiNuzzo1, Daniele Mascali2, Giorgia Bussu3

  • 1Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Rome, Italy.

Human Brain Mapping
|June 13, 2022
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Summary

The right hemisphere

Keywords:
covert attentionfunctional connectivityhemispheric segregationreaction timessteady-state fMRItask performance

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Visuospatial attention is typically lateralized to the right hemisphere.
  • The influence of this hemispheric asymmetry on information transfer and performance remains unclear.

Purpose of the Study:

  • To investigate how attention side affects functional connectivity (FC) and its relation to performance.
  • To explore inter-hemispheric information transfer during visuospatial attention tasks.

Main Methods:

  • Used steady-state fMRI functional connectivity (FC) analysis.
  • Employed a region of interest (ROI) and network-based approach.
  • Analyzed data during a covert visuospatial attention task (leftward/rightward).

Main Results:

  • Global FC topology was independent of the attended side.
  • Attention side modulated FC strength between brain networks.
  • Leftward attention involved right visual network connections with attention networks.

Conclusions:

  • Hemispheric functional segregation correlates with faster response times, indicating better performance.
  • Right hemisphere dominance in visuospatial attention is linked to beneficial hemispheric functional segregation.