Altered ability to access a clinically relevant control network in patients remitted from major depressive disorder
File(s)Figueroa_et_al-2019-Human_Brain_Mapping.pdf (2.83 MB)
Published version
OA Location
Author(s)
Type
Journal Article
Abstract
Neurobiological models to explain vulnerability of major depressive disorder (MDD) are scarce and previous functional magnetic resonance imaging studies mostly examined "static" functional connectivity (FC). Knowing that FC constantly evolves over time, it becomes important to assess how FC dynamically differs in remitted-MDD patients vulnerable for new depressive episodes. Using a recently developed method to examine dynamic FC, we characterized re-emerging FC states during rest in 51 antidepressant-free MDD patients at high risk of recurrence (≥2 previous episodes), and 35 healthy controls. We examined differences in occurrence, duration, and switching profiles of FC states after neutral and sad mood induction. Remitted MDD patients showed a decreased probability of an FC state (p < 0.005) consisting of an extensive network connecting frontal areas-important for cognitive control-with default mode network, striatum, and salience areas, involved in emotional and self-referential processing. Even when this FC state was observed in patients, it lasted shorter (p < 0.005) and was less likely to switch to a smaller prefrontal-striatum network (p < 0.005). Differences between patients and controls decreased after sad mood induction. Further, the duration of this FC state increased in remitted patients after sad mood induction but not in controls (p < 0.05). Our findings suggest reduced ability of remitted-MDD patients, in neutral mood, to access a clinically relevant control network involved in the interplay between externally and internally oriented attention. When recovering from sad mood, remitted recurrent MDD appears to employ a compensatory mechanism to access this FC state. This study provides a novel neurobiological profile of MDD vulnerability.
Date Issued
2019-06-15
Date Acceptance
2019-02-21
Citation
Human Brain Mapping, 2019, 40 (9), pp.2771-2786
ISSN
1065-9471
Publisher
Wiley
Start Page
2771
End Page
2786
Journal / Book Title
Human Brain Mapping
Volume
40
Issue
9
Copyright Statement
© 2019 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium,provided the original work is properly cited.
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/30864248
Grant Number
EP/N014529/1
Subjects
cognitive control
dynamic FC
functional networks
major depressive disorder
resting-state fMRI
Publication Status
Published
Coverage Spatial
United States
Date Publish Online
2019-03-12