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Structural-functional connectivity bandwidth of the human brain.

Nicholas Parsons1, Julien Ugon2, Kerri Morgan2

  • 1Cognitive Neuroscience Unit, School of Psychology, Deakin University, Melbourne, VIC, Australia.

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This study reveals how indirect structural connections, not just direct ones, are crucial for brain communication. Analyzing these pathways helps understand brain network function and potential disorders.

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Area of Science:

  • Neuroscience
  • Network Science
  • Medical Imaging

Background:

  • The human brain's behavior and cognition arise from a complex network of neurons mediating communication.
  • Understanding the relationship between structural connectivity (SC) and functional connectivity (FC) is key to deciphering brain function.

Purpose of the Study:

  • To develop and apply a novel method for quantifying the throughput of structural connectivity (SC) in mediating functional connectivity (FC).
  • To reconcile SC and FC using multilayer network analysis and MRI data.

Main Methods:

  • Utilized diffusion and resting-state functional MRI data from the Human Connectome Project (484 subjects).
  • Implemented a novel method to count and weight indirect structural paths mediating FC, termed SC-FC Bandwidth.
  • Mapped high SC-FC Bandwidth paths across canonical resting-state networks.

Main Results:

  • Most FC nodes are connected via indirect SC paths of length two or three, with direct connections accounting for only 10%.
  • Indirect paths of length two (44%) and three (39%) predominantly mediate FC.
  • High-bandwidth SC-FC connections exhibit specific intra- and inter-network connectivity patterns and distributions within somatomotor and default mode networks.

Conclusions:

  • The developed method measures indirect SC-FC, mapping the throughput of SC in mediating FC using multimodal MRI data.
  • Future research could explore SC-FC Bandwidth changes over time, its relation to cognition, and its potential as a marker for neurological injury or psychiatric disorders.