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Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression
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Depression and worry symptoms predict future executive functioning impairment via inflammation.

Nur Hani Zainal1, Michelle G Newman1

  • 1Department of Psychology, The Pennsylvania State University, University Park, PA 16802, USA.

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Heightened depression and anxiety symptoms predict inflammation, which in turn forecasts reduced executive function (EF) over 20 months. Treating these conditions may prevent cognitive decline.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Immunology

Background:

  • Scar models suggest anxiety and depression increase inflammation, leading to reduced executive function (EF) over time.
  • Previous research primarily used cross-sectional designs, limiting understanding of causal pathways.
  • This study investigated if generalized anxiety disorder (GAD), major depressive disorder (MDD), and panic disorder (PD) symptoms predict future EF through inflammation.

Purpose of the Study:

  • To examine the longitudinal relationship between GAD, MDD, and PD symptoms and executive function (EF).
  • To investigate the mediating role of inflammation in the association between these mental health conditions and EF.
  • To determine if inflammation acts as a mechanism linking mental health symptoms to cognitive decline.

Main Methods:

  • Longitudinal study with 614 community-dwelling adults.
  • Assessed T1 symptom severity (GAD, MDD, PD), T2 inflammation markers (C-reactive protein, fibrinogen, interleukin-6), and T3 EF.
  • Employed structural equation mediation modeling to analyze the pathways.

Main Results:

  • Elevated MDD and GAD symptoms at T1 predicted increased inflammation at T2.
  • Heightened T2 inflammation forecasted lower EF at T3.
  • Inflammation mediated 25-32% of the negative association between MDD/GAD and EF.
  • Direct effects of MDD, GAD, and PD on reduced EF were also observed.
  • Findings persisted after controlling for relevant covariates.

Conclusions:

  • Inflammation serves as a key mechanism linking MDD and GAD to decrements in EF over 20 months.
  • Interventions targeting depression, anxiety, and inflammation may help prevent cognitive decline.
  • This research highlights the interconnectedness of mental health, inflammation, and cognitive function.