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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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Interhemispheric functional connectivity: an fMRI study in callosotomized patients.

Ilaria Marcantoni1, Giusi Piccolantonio2, Mojgan Ghoushi3

  • 1Dipartimento di Ingegneria dell'Informazione, Università Politecnica delle Marche, Ancona, Italy.

Frontiers in Human Neuroscience
|May 30, 2024
PubMed
Summary

Even without the corpus callosum (CC), residual interhemispheric functional connectivity (FC) exists. This residual FC may involve subcortical pathways, suggesting some brain integration persists after CC resection.

Keywords:
callosotomyfunctional connectivityinterhemispheric connectivitylateralizationresting-state

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Area of Science:

  • Neuroscience
  • Brain Imaging
  • Neurology

Background:

  • Functional connectivity (FC) describes temporal correlations in physiological signals, primarily dependent on structural connectivity.
  • Interhemispheric FC is largely attributed to the corpus callosum (CC), but evidence remains inconclusive.
  • Split-brain patients, with resected CCs, offer a unique model to study interhemispheric FC.

Purpose of the Study:

  • To investigate interhemispheric functional connectivity (FC) in patients with surgically resected corpus callosum (CC) using resting-state fMRI.
  • To explore the role of the CC in supporting interhemispheric communication.

Main Methods:

  • Resting-state functional magnetic resonance imaging (fMRI) was employed.
  • Probabilistic independent component analysis (ICA) was used for evaluating interhemispheric FC and identifying resting-state networks (RSNs).
  • Analysis focused on six epileptic patients who underwent CC resection.

Main Results:

  • Bilateral brain activation was frequently observed in primary sensory RSNs.
  • Activation in associative RSNs, including default mode and fronto-parietal networks, was often unilateral.
  • This indicates differential impact of CC resection on various brain networks.

Conclusions:

  • The study suggests the presence of residual interhemispheric communication even after CC resection.
  • This residual FC may be mediated by extra-callosal, potentially subcortical, pathways.
  • Further research is required to fully elucidate the mechanisms of this residual interhemispheric integration.