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Related Concept Videos

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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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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Mapping the principal gradient onto the corpus callosum.

Patrick Friedrich1, Stephanie J Forkel2, Michel Thiebaut de Schotten1

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This study maps the brain's principal functional gradient onto the corpus callosum, revealing its relationship with white matter connectivity. Extreme gradient values are found in specific callosal regions with distinct connectivity patterns.

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Area of Science:

  • Neuroimaging
  • Connectomics
  • Brain functional organization

Background:

  • Resting-state functional magnetic resonance imaging (rsfMRI) gradients capture signal variance.
  • The principal gradient reflects a functional hierarchy from sensory-motor to default-mode networks.
  • White matter mapping of this gradient, especially in the corpus callosum, remains underexplored.

Purpose of the Study:

  • Map the principal gradient onto the corpus callosum's midsection.
  • Investigate the relationship between callosal connectivity and gradient values.
  • Understand the functional organization of major white matter tracts.

Main Methods:

  • Utilized the 7T Human Connectome Project dataset.
  • Mapped the principal gradient onto the corpus callosum's midsection.
  • Analyzed quantitative connectivity measures and variability.

Main Results:

  • Extreme principal gradient values are located in the callosal genu and posterior body.
  • These extreme regions show lower connectivity variability and larger spatial extent.
  • Mid-range gradient values exhibit different connectivity characteristics.

Conclusions:

  • The principal gradient is spatially organized within the corpus callosum.
  • Callosal connectivity patterns correlate with the functional hierarchy.
  • Findings may inform understanding of brain evolution and asymmetries.