Temporal dynamic patterns of the ventromedial prefrontal cortex underlie the association between rumination and depression

Wei Gao, Bharat Biswal, Jiemin Yang, Songlin Li, Yanqing Wang, Shengdong Chen, Jiajin Yuan

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

As a major contributor to the development of depression, rumination has proven linked with aberrant default-mode network (DMN) activity. However, it remains unclear how the spontaneous spatial and temporal activity of DMN underlie the association between rumination and depression. To illustrate this issue, behavioral measures and resting-state functional magnetic resonance images were connected in 2 independent samples (NSample1 = 100, NSample2 = 95). Fractional amplitude of low-frequency fluctuations (fALFF) and regional homogeneity (ReHo) were used to assess spatial characteristic patterns, while voxel-wise functional concordance (across time windows) (VC) and Hurst exponent (HE) were used to assess temporal dynamic patterns of brain activity. Results from both samples consistently show that temporal dynamics but not spatial patterns of DMN are associated with rumination. Specifically, rumination is positively correlated with HE and VC (but not fALFF and ReHo) values, reflecting more consistent and regular temporal dynamic patterns in DMN. Moreover, subregion analyses indicate that temporal dynamics of the ventromedial prefrontal cortex (VMPFC) reliably predict rumination scores. Furthermore, mediation analyses show that HE and VC of VMPFC mediate the association between rumination and depression. These findings shed light on neural mechanisms of individual differences in rumination and corresponding risk for depression.

Original languageEnglish (US)
Pages (from-to)969-982
Number of pages14
JournalCerebral Cortex
Volume33
Issue number4
DOIs
StatePublished - Feb 15 2023

All Science Journal Classification (ASJC) codes

  • Cognitive Neuroscience
  • Cellular and Molecular Neuroscience

Keywords

  • VMPFC
  • depression
  • rumination
  • spatial patterns
  • temporal dynamics

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