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Related Experiment Video

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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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Abnormal structural networks characterize major depressive disorder: a connectome analysis.

Mayuresh S Korgaonkar1, Alex Fornito2, Leanne M Williams3

  • 1The Brain Dynamics Centre, Sydney Medical School-Westmead and Westmead Millennium Institute for Medical Research, Sydney; Discipline of Psychiatry, University of Sydney Medical School: Western, Westmead Hospital, Sydney.

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Summary

Major depressive disorder (MDD) is linked to reduced structural brain connectivity in default mode and frontal-thalamo-caudate networks. These connectomic alterations are core neurobiological features of depression.

Keywords:
Biomarkerconnectomediffusion tensor imaginggraph theorymajor depressive disordernetwork based statistics

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Area of Science:

  • Neuroimaging
  • Connectomics
  • Brain Networks

Background:

  • Major depressive disorder (MDD) is associated with altered functional brain network organization.
  • The structural basis of these functional changes in MDD remains largely unknown.
  • Diffusion tensor imaging (DTI) provides whole-brain mapping of white matter tracts, crucial for understanding the human connectome.

Purpose of the Study:

  • To investigate whole-brain structural network alterations in individuals with MDD.
  • To identify specific white matter connectivity differences between MDD patients and healthy controls.

Main Methods:

  • Examined structural networks in 95 MDD outpatients and 102 controls using DTI tractography.
  • Represented brain networks via 84x84 connectivity matrices of white matter connections.
  • Employed network-based statistics and graph theory to analyze interregional connectivity and network topology.

Main Results:

  • Identified significantly reduced structural connectivity in two networks in MDD patients.
  • These networks involve the default mode network and frontal-thalamo-caudate regions.
  • Overall network topology remained preserved, with no significant group differences in graph theory measures.

Conclusions:

  • This study provides the first DTI-based evidence of structural connectomic alterations in MDD.
  • Altered structural connectivity within the default mode and frontal-thalamo-caudate networks are key neurobiological features of MDD.
  • These findings underscore the importance of structural connectomics in understanding MDD pathophysiology.