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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: Oct 23, 2025

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Common and unique structural plasticity after left and right hemisphere stroke.

Yijun Chen1, Yaya Jiang1, Xiangyu Kong1

  • 1State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing, China.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|August 20, 2021
PubMed
Summary

Left and right hemisphere strokes show common and unique brain plasticity patterns. These structural changes in critical brain regions correlate with stroke recovery, highlighting neuroplasticity mechanisms.

Keywords:
Left hemisphere strokegray matter volumepoststroke plasticityright hemisphere strokevoxel-based morphometry

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Area of Science:

  • Neuroscience
  • Neurology
  • Radiology

Background:

  • Strokes affecting the left and right brain hemispheres result in distinct behavioral outcomes.
  • Understanding hemispheric neuroplasticity post-stroke is crucial for revealing brain damage response mechanisms.

Purpose of the Study:

  • To investigate and compare post-stroke structural neuroplasticity patterns in left hemisphere strokes (LHS) versus right hemisphere strokes (RHS).
  • To determine if neuroplasticity differs between hemispheres and its relation to behavioral recovery.

Main Methods:

  • Longitudinal MRI data from 69 LHS patients, 55 RHS patients, and 31 healthy controls were analyzed.
  • Structural changes, specifically gray matter (GM) volume alterations, were tracked from 2 weeks to 3 months post-stroke onset.

Main Results:

  • Both LHS and RHS groups exhibited common GM changes, including expansion in the precuneus and superior frontal gyrus, and shrinkage in the medial orbital frontal gyrus and middle cingulate cortex.
  • RHS patients uniquely showed GM expansion in the ipsilesional medial superior and orbital frontal cortex.
  • These GM changes predominantly occurred in highly-connected cortical hub regions and correlated with behavioral recovery.

Conclusions:

  • Post-stroke structural neuroplasticity occurs in common and unique patterns across hemispheres, particularly within cortical hubs.
  • GM volumetric changes in these hub regions reflect adaptive compensatory mechanisms crucial for stroke recovery.
  • Neuroplasticity in hub regions and its hemispheric specificity are vital for effective stroke rehabilitation.