Baseline working memory activation deficits in dimensional anxious depression as detected by magnetoencephalography

Dawn F. Ionescu, Allison C. Nugent, David A. Luckenbaugh, Mark J. Niciu, Erica M. Richards, Carlos A. Zarate, Maura L. Furey

Research output: Contribution to journalArticlepeer-review

Abstract

Objective Anxiety often co-occurs with major depressive disorder (MDD). This preliminary study sought to ascertain the extent to which anxious depression drives group neurobiological differences between patients with MDD and healthy volunteers (HVs). Methods Magnetoencephalography beta-band frequency was used to compare differences in brain response during the N-back working memory task between 30 medication-free patients with treatment-resistant MDD (anxious depression=18; nonanxious depression=12) and 28 HVs. Results Compared to HVs, patients with anxious depression had significantly reduced desynchronisation (less activation) in the left precuneus, right cuneus, and left insula extending into the inferior and middle frontal cortex during the 2-back condition compared with the 1-back condition of the N-back working memory task - indicating less activation of these neural networks in patients with anxious depression during the condition with the highest level of task demands. No other significant group differences were found during the working memory conditions. Conclusion This preliminary study suggests that a subset of patients - those with anxious depression - may be driving observed group differences between patients with MDD and HVs. Further neurobiological studies and replication experiments are necessary to determine the extent to which this subgroup has preferentially influenced our understanding of the underlying neurobiology of depression.

Original languageEnglish (US)
Pages (from-to)143-152
Number of pages10
JournalActa Neuropsychiatrica
Volume27
Issue number3
DOIs
StatePublished - Jan 20 2015
Externally publishedYes

Keywords

  • N-back task
  • anxious depression
  • magnetoencephalography (MEG)
  • major depressive disorder
  • neurobiology

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Biological Psychiatry

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