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Related Experiment Video

Updated: Feb 16, 2026

Cerebral Blood Flow-Based Resting State Functional Connectivity of the Human Brain using Optical Diffuse Correlation Spectroscopy
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Knowing left from right: asymmetric functional connectivity during resting state.

Mathijs Raemaekers1, Wouter Schellekens2, Natalia Petridou3

  • 1Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht University, Str. 4.205, Postbus 85060, 3508 AB, Utrecht, The Netherlands. m.raemaekers-2@umcutrecht.nl.

Brain Structure & Function
|January 5, 2018
PubMed
Summary

Brain connectivity shows significant asymmetries, particularly in language areas, varying across individuals. These brain asymmetries correlate with language lateralization and handedness, revealing individual differences in brain function.

Keywords:
ConnectivityHandednessLanguageLateralizationfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Brain Imaging

Background:

  • Hemispheric specialization leads to functional differences between the left and right brain hemispheres.
  • Individual variations in brain function are linked to these hemispheric asymmetries.
  • Asymmetric Functional Connectivity (AFC) quantifies differences in brain connectivity between hemispheres.

Purpose of the Study:

  • To investigate Asymmetric Functional Connectivity (AFC) in the human brain.
  • To determine how AFC varies across individuals.
  • To explore the relationship between AFC, language lateralization, and handedness.

Main Methods:

  • Utilized resting-state and language task fMRI data from the Human Connectome Project (423 subjects).
  • Calculated AFC by comparing resting-state brain connectivity with its mirrored counterpart.
  • Analyzed patterns of AFC and their correlation with behavioral measures.

Main Results:

  • Quantified brain connectivity symmetry at 95%, identifying significant asymmetries.
  • Observed higher correlations in left hemisphere language areas and between right hemisphere language homologues and the default mode network.
  • Found correlations between AFC patterns, language lateralization, and handedness, with additional patterns involving entire hemispheres and limbic areas.

Conclusions:

  • Language is a key, but not the sole, determinant of Asymmetric Functional Connectivity.
  • Observed AFC patterns provide insights into individual differences in brain organization.
  • Further research is needed to understand the neuronal basis of additional AFC patterns.