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Cerebral Blood Flow-Based Resting State Functional Connectivity of the Human Brain using Optical Diffuse Correlation Spectroscopy
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Subject specificity of the correlation between large-scale structural and functional connectivity.

J Zimmermann1, J Griffiths1, M Schirner2

  • 1Baycrest Health Sciences, Rotman Research Institute, Toronto, Ontario, Canada.

Network Neuroscience (Cambridge, Mass.)
|February 23, 2019
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Summary

The link between brain structural connectivity (SC) and functional connectivity (FC) varies by individual. Subject-specific SC-FC relationships are limited across datasets due to differences in SC and FC variability.

Keywords:
Functional connectivityIndividual variabilityStructural connectivity

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Area of Science:

  • Neuroscience
  • Brain Imaging
  • Connectomics

Background:

  • Structural connectivity (SC) represents physical brain pathways, while functional connectivity (FC) describes temporal coactivations.
  • The precise relationship between SC and FC remains incompletely understood.
  • Investigating SC-FC links is crucial for comprehending brain organization and function.

Purpose of the Study:

  • To investigate the subject specificity of the relationship between structural connectivity and functional connectivity.
  • To determine if SC-FC relationships are consistent across individuals and different neuroimaging datasets.
  • To identify factors influencing the subject specificity of SC-FC correspondence.

Main Methods:

  • Analysis of six distinct human neuroimaging datasets with varying acquisition and preprocessing.
  • Application of simple linear association methods to assess SC-FC relationships.
  • Comparison of SC-FC fit across subjects and datasets, including the Glasser Human Connectome Project (HCP) dataset.

Main Results:

  • The SC-FC relationship was not subject-specific in five out of six datasets using simple linear associations.
  • Subject specificity of SC-FC fit was achieved only in the multimodal Glasser Human Connectome Project (HCP) parcellated dataset.
  • Limited subject specificity across datasets was attributed to smaller inter-subject variability in SC compared to FC.

Conclusions:

  • The correspondence between SC and FC is not consistently subject-specific across diverse neuroimaging datasets.
  • The variability in SC and FC influences the degree of subject specificity observed.
  • Further research is needed to fully elucidate the complex SC-FC relationship and its subject-specific characteristics.