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Related Concept Videos

Cerebral Hemispheres01:05

Cerebral Hemispheres

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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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Lateralization01:28

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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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Related Experiment Video

Updated: Oct 21, 2025

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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Aging-Related Differences in Structural and Functional Interhemispheric Connectivity.

John D Lewis1, Christian O'Reilly2, Elizabeth Bock3

  • 1McGill Centre for Integrative Neuroscience, Montreal Neurological Institute, McGill University, Montreal, Quebec, H3A 2B4, Canada.

Cerebral Cortex (New York, N.Y. : 1991)
|September 8, 2021
PubMed
Summary
This summary is machine-generated.

Aging reduces white matter integrity, impacting brain connectivity. White matter health in the corpus callosum predicts age-related changes in visual functional connectivity, revealing a causal link.

Keywords:
functional connectivitylagged coherencemediationstructural connectivitywhite-matter integrity

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Area of Science:

  • Neuroscience
  • Aging Research
  • Connectomics

Background:

  • Age-related declines in anatomical and functional brain connectivity are well-documented.
  • The precise relationship between structural reductions and functional alterations remains unclear.
  • Investigating interhemispheric visual cortex connections offers a focused approach to understanding these age-related changes.

Purpose of the Study:

  • To investigate the relationship between white matter integrity and functional connectivity in the aging brain.
  • To examine how age affects interhemispheric visual cortex connections.
  • To determine if structural integrity predicts functional connectivity differences related to visual stimuli.

Main Methods:

  • Collected T1-weighted and diffusion-weighted imaging data to assess white matter integrity.
  • Measured functional connectivity using electroencephalography (EEG) during visual stimulus presentation.
  • Analyzed interhemispheric lagged coherence between visual cortices for agreeing and disagreeing stimuli.

Main Results:

  • Demonstrated age-related reductions in white matter integrity connecting the visual cortices.
  • Observed age-related increases in the difference of functional interhemispheric lagged coherence between stimulus conditions.
  • Found that white matter integrity in the splenium of the corpus callosum predicts these lagged coherence differences, with age as a mediator.

Conclusions:

  • Structural integrity of the corpus callosum is crucial for age-related functional connectivity.
  • Provides new insights into the causal relationship between aging, white matter integrity, and visual functional connectivity.
  • Highlights the importance of studying specific brain pathways to understand complex age-related neural changes.