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  • JeYoung Jung
    University of Manchester
  • Lauren Cloutman
    University of Manchester
  • Richard Binney
    University of Manchester
  • Matthew Lambon Ralph
    University of Manchester
Human higher cognition arises from the main tertiary association cortices including the frontal, temporal and parietal lobes. Many studies have suggested that cortical functions must be shaped or emerge from the pattern of underlying physical (white matter) connectivity. Despite the importance of this hypothesis, there has not been a large-scale analysis of the white-matter connectivity within and between these associative cortices. Thus, we explored the pattern of intra- and inter-lobe white matter connectivity between multiple areas defined in each lobe. We defined 43 regions of interest on the lateral associative cortex cytoarchitectonically (6 regions of interest – ROIs in the frontal lobe and 17 ROIs in the parietal lobe) and anatomically (20 ROIs in the temporal lobe) on individuals' native space. The results demonstrated that intra-region connectivity for all 3 lobes was dense and graded generally. In contrary, the inter-lobe connectivity was relatively discrete and regionally specific such that only small sub-regions exhibited long-range connections to another lobe. The long-range connectivity was mediated by 6 major associative white matter tracts, consistent with the notion that these higher cognitive functions arises from brain-wide distributed connectivity. Using graph-theory network analysis we revealed five physically-connected sub-networks, which correspond directly to five known functional networks. This study provides strong and direct evidence that core functional brain networks mirror the brain's structural connectivity.

Keywords

  • Associative cortex, Higher cognitive function, Diffusion weighted imaging, Tractography, Graph-theory
Original languageEnglish
Pages (from-to)221-239
JournalCortex
Volume97
Issue numberDecember
Early online date2 Sep 2016
DOIs
Publication statusPublished - Dec 2017
Externally publishedYes

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