Parallel Interdigitated Distributed Networks within the Individual Estimated by Intrinsic Functional Connectivity

Rodrigo M. Braga*, Randy L. Buckner

*Corresponding author for this work

Research output: Contribution to journalArticle

125 Scopus citations

Abstract

Certain organizational features of brain networks present in the individual are lost when central tendencies are examined in the group. Here we investigated the detailed network organization of four individuals each scanned 24 times using MRI. We discovered that the distributed network known as the default network is comprised of two separate networks possessing adjacent regions in eight or more cortical zones. A distinction between the networks is that one is coupled to the hippocampal formation while the other is not. Further exploration revealed that these two networks were juxtaposed with additional networks that themselves fractionate group-defined networks. The collective networks display a repeating spatial progression in multiple cortical zones, suggesting that they are embedded within a broad macroscale gradient. Regions contributing to the newly defined networks are spatially variable across individuals and adjacent to distinct networks, raising issues for network estimation in group-averaged data and applied endeavors, including targeted neuromodulation. Braga and Buckner examine the detailed organization of brain networks within individual people. They discovered that multiple closely juxtaposed cortical regions form parallel distributed networks. Separate large-scale networks may emerge from a common organizing principle.

Original languageEnglish (US)
Pages (from-to)457-471.e5
JournalNeuron
Volume95
Issue number2
DOIs
StatePublished - Jul 19 2017
Externally publishedYes

Keywords

  • association cortex
  • brain systems
  • default network
  • dorsal attention network
  • frontoparietal network
  • hippocampus
  • memory

ASJC Scopus subject areas

  • Neuroscience(all)

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