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Articles, Systems/Circuits

Developmental Changes in Brain Network Hub Connectivity in Late Adolescence

Simon T.E. Baker, Dan I. Lubman, Murat Yücel, Nicholas B. Allen, Sarah Whittle, Ben D. Fulcher, Andrew Zalesky and Alex Fornito
Journal of Neuroscience 17 June 2015, 35 (24) 9078-9087; DOI: https://doi.org/10.1523/JNEUROSCI.5043-14.2015
Simon T.E. Baker
1Turning Point, Eastern Health and Eastern Health Clinical School, Monash University, Victoria 3065, Australia,
2Monash Clinical and Imaging Neuroscience, School of Psychological Sciences and Monash Biomedical Imaging, Monash University, Victoria 3168, Australia,
3Melbourne Neuropsychiatry Centre, Department of Psychiatry, The University of Melbourne and Melbourne Health, Victoria 3053, Australia,
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Dan I. Lubman
1Turning Point, Eastern Health and Eastern Health Clinical School, Monash University, Victoria 3065, Australia,
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Murat Yücel
2Monash Clinical and Imaging Neuroscience, School of Psychological Sciences and Monash Biomedical Imaging, Monash University, Victoria 3168, Australia,
3Melbourne Neuropsychiatry Centre, Department of Psychiatry, The University of Melbourne and Melbourne Health, Victoria 3053, Australia,
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Nicholas B. Allen
4Melbourne School of Psychological Sciences,
5Orygen Youth Health Research Centre, Centre for Youth Mental Health, and
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Sarah Whittle
3Melbourne Neuropsychiatry Centre, Department of Psychiatry, The University of Melbourne and Melbourne Health, Victoria 3053, Australia,
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Ben D. Fulcher
2Monash Clinical and Imaging Neuroscience, School of Psychological Sciences and Monash Biomedical Imaging, Monash University, Victoria 3168, Australia,
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Andrew Zalesky
3Melbourne Neuropsychiatry Centre, Department of Psychiatry, The University of Melbourne and Melbourne Health, Victoria 3053, Australia,
6Melbourne School of Engineering, The University of Melbourne, Victoria 3010, Australia
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Alex Fornito
2Monash Clinical and Imaging Neuroscience, School of Psychological Sciences and Monash Biomedical Imaging, Monash University, Victoria 3168, Australia,
3Melbourne Neuropsychiatry Centre, Department of Psychiatry, The University of Melbourne and Melbourne Health, Victoria 3053, Australia,
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Abstract

The human brain undergoes substantial development throughout adolescence and into early adulthood. This maturational process is thought to include the refinement of connectivity between putative connectivity hub regions of the brain, which collectively form a dense core that enhances the functional integration of anatomically distributed, and functionally specialized, neural systems. Here, we used longitudinal diffusion magnetic resonance imaging to characterize changes in connectivity between 80 cortical and subcortical anatomical regions over a 2 year period in 31 adolescents between the ages of 15 and 19 years. Connectome-wide analysis indicated that only a small subset of connections showed evidence of statistically significant developmental change over the study period, with 8% and 6% of connections demonstrating decreased and increased structural connectivity, respectively. Nonetheless, these connections linked 93% and 90% of the 80 regions, respectively, pointing to a selective, yet anatomically distributed pattern of developmental changes that involves most of the brain. Hub regions showed a distinct tendency to be highly connected to each other, indicating robust “rich-club” organization. Moreover, connectivity between hubs was disproportionately influenced by development, such that connectivity between subcortical hubs decreased over time, whereas frontal–subcortical and frontal–parietal hub–hub connectivity increased over time. These findings suggest that late adolescence is characterized by selective, yet significant remodeling of hub–hub connectivity, with the topological organization of hubs shifting emphasis from subcortical hubs in favor of an increasingly prominent role for frontal hub regions.

  • adolescence
  • connectome
  • development
  • graph theory
  • MRI
  • structural connectivity
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The Journal of Neuroscience: 35 (24)
Journal of Neuroscience
Vol. 35, Issue 24
17 Jun 2015
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Developmental Changes in Brain Network Hub Connectivity in Late Adolescence
Simon T.E. Baker, Dan I. Lubman, Murat Yücel, Nicholas B. Allen, Sarah Whittle, Ben D. Fulcher, Andrew Zalesky, Alex Fornito
Journal of Neuroscience 17 June 2015, 35 (24) 9078-9087; DOI: 10.1523/JNEUROSCI.5043-14.2015

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Developmental Changes in Brain Network Hub Connectivity in Late Adolescence
Simon T.E. Baker, Dan I. Lubman, Murat Yücel, Nicholas B. Allen, Sarah Whittle, Ben D. Fulcher, Andrew Zalesky, Alex Fornito
Journal of Neuroscience 17 June 2015, 35 (24) 9078-9087; DOI: 10.1523/JNEUROSCI.5043-14.2015
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Keywords

  • adolescence
  • connectome
  • development
  • graph theory
  • MRI
  • structural connectivity

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