Automaticity as a Vulnerability to Depression: Daily Mood-Reactive Rumination and Early-Life Stress in People With- and Without Depression History

Depressive rumination has been conceptualized as a mental habit that is initiated automatically without conscious awareness, intent or control in response to negative mood. However, it is unknown whether depression vulnerability is characterized by elevated levels of mood-reactive rumination at the level of short-term dynamics. Using mobile ecological momentary assessment, formerly depressed individuals with a recurrent history of depression (n = 94) and non-clinical controls (n = 55) recorded in-the-moment affect and rumination ten times daily over six days, after completing measures of trait ruminative brooding, early-life stress, and habitual characteristics of negative thinking (e.g., automaticity, lack of conscious awareness, intent, and control). Momentary fluctuations in negative affect were prospectively associated with greater rumination at the next sampling occasion in formerly depressed participants whereas this pattern was not observed in non-clinical controls. In formerly depressed participants, the degree of mood-reactivity was moderated by habitual characteristics of negative thinking, which interacted with a history of early-life stress in predicting greater mood-reactive rumination. It was not, however, associated with depression course nor with the frequency of trait ruminative brooding. Mood-reactive rumination may be a vulnerability marker for depression, triggered in response to negative affect with a high degree of automaticity, making it difficult to control. It might constitute a risk independent of the depressive course and originate in early-life stress. Future studies may need to go beyond frequency and target the mood-reactivity and automaticity of ruminative thinking to reduce depression vulnerability

Maternal depression, child temperament, and early life stress predict never-depressed preadolescents’ functional connectivity during a negative mood induction

A better understanding of the development of depression can inform etiology and prevention/intervention. Maternal depression and maladaptive temperamental emotionality (e.g., low positive emotionality [PE] or high negative emotionality, especially sadness) are known to predict depression. While it is unclear how these risks cause depression, altered functional connectivity (FC), particularly during negative emotion processing, may play an important role. We investigated whether maternal depression and age-three emotionality predicted FC during negative mood reactivity in never-depressed preadolescents, and whether these predictive relationships were augmented by early life stress. Maternal depression was associated with decreased mPFC-amygdala and mPFC-insula FC, but increased mPFC-PCC FC. PE was associated with increased dlPFC-amygdala FC while sadness was related to increased PCC-based FC in insula, OFC, and ACC. Further, sadness was more strongly associated with PCC-insula and PCC-ACC FC as early stress increased. Findings indicate that early depression risks may be mediated by FC underlying negative emotion processing.

Carving depression at its joints? Psychometric properties of the Sydney Melancholia Prototype Index

Parker and colleagues developed the Sydney Melancholia Prototype Index (SMPI), a 24-item measure to assess a potential subtype of depression: melancholia. While research supports the validity of the measure, no study has assessed its psychometric properties. We recruited 1633 participants online, of whom 487 reported a lifetime period of depressed mood or anhedonia and were administered the SMPI. We conducted confirmatory factor analyses (CFA) of the SMPI, to assess the proposed fit of the measure. We also conducted exploratory factor analyses (EFA) to explore the structure implied by the current data. CFA did not support the hypothesized factor structure of the SMPI, no matter what structure we assumed as primary (i.e., a one factor, two factor, or bifactor model). An EFA suggested a five-factor solution wherein several items did not appear to co-vary reliably and other factors captured the severity of melancholic symptoms, negative mood reactivity, positive mood reactivity, emotionality and family relationships, and early life adversity. The SMPI may not measure a single construct. Future research should explore the longitudinal association between depression severity, contaminant symptoms, positive and negative mood reactivity, and early life experiences

Reduced neural response to reward and pleasant pictures independently relate to depression

Background Multiple studies have found a reduced reward positivity (RewP) among individuals with major depressive disorder (MDD). Event-related potential studies have also reported blunted neural responses to pleasant pictures in MDD as reflected by the late positive potential (LPP). These deficits have been interpreted broadly in terms of anhedonia and decreased emotional engagement characteristic of depression. Methods In the current study, a community-based sample of 83 participants with current MDD and 45 healthy individuals performed both a guessing task and a picture viewing paradigm with neutral and pleasant pictures to assess the RewP and the LPP, respectively. Results We found that both RewP and LPP to pleasant pictures were reduced in the MDD group; moreover, RewP and LPP were both independent predictors of MDD status. Within the MDD group, a smaller RewP predicted impaired mood reactivity in younger but not older participants. Smaller LPP amplitudes were associated with increased anhedonia severity in the MDD group. Conclusions These data replicate and merge separate previous lines of research, and suggest that a blunted RewP and LPP reflect independent neural deficits in MDD – which could be used in conjunction to improve the classification of depression.