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Related Concept Videos

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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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Cerebral Hemispheres01:05

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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: Jun 16, 2025

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
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Brain-Hand Function Relationships Based on Level of Grasp Function in Chronic Left-Hemisphere Stroke.

Elizabeth Rizor1, Julius Fridriksson2, Denise M Peters3

  • 1Department of Exercise Science, University of South Carolina, Columbia, SC, USA.

Neurorehabilitation and Neural Repair
|August 20, 2024
PubMed
Summary

Resting state functional connectivity (RsFC) in motor networks is reduced in stroke survivors with low hand function. Brain-behavior relationships differ by impairment level, impacting stroke recovery predictions.

Keywords:
corticospinal tractfunctional connectivityhand functionstroke

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomarkers

Background:

  • Hand function impairment is common after stroke.
  • Biomarkers for hand function may vary with motor impairment severity.
  • Understanding brain-behavior relationships is crucial for stroke recovery.

Purpose of the Study:

  • To investigate the link between resting state functional connectivity (RsFC) and contralesional hand function in chronic stroke.
  • To determine if brain-behavior relationships differ based on hand grasp function levels.

Main Methods:

  • Sixty-two individuals with chronic left-hemisphere stroke were grouped into Low, Moderate, and High hand function categories based on the Box and Blocks Test.
  • Resting state functional connectivity (RsFC) was assessed using neuroimaging techniques.
  • Hand function was measured by grip strength and the Stroke Impact Scale Hand score.

Main Results:

  • Reduced RsFC in ipsilesional and interhemispheric motor networks was observed in the Low function group compared to Moderate and High groups.
  • Interhemispheric RsFC correlated with hand function across all participants.
  • Contralesional RsFC predicted hand function only in the Low group; corticospinal tract integrity predicted function in the Moderate group and overall.

Conclusions:

  • Brain-hand function relationships vary significantly with the level of motor impairment after stroke.
  • These findings have implications for developing targeted interventions and predictive models for stroke rehabilitation.
  • Differentiated approaches to stroke recovery may be necessary based on individual functional levels.