The measurement of cognitive reactivity to sad mood in patients remitted from major depressive disorder

Probiotics reduce negative mood over time: the value of daily self-reports in detecting effects

The burgeoning field of the microbiome-gut-brain axis has inspired research into how the gut microbiome can affect human emotion. Probiotics offer ways to investigate microbial-based interventions but results have been mixed, with more evidence of beneficial effects in clinically depressed patients. Using a randomised, double-blind, placebo-controlled design in 88 healthy volunteers, we conduct a comprehensive study into effects of a multispecies probiotic on emotion regulation and mood through questionnaires, emotional processing tests and daily reports. We find clear evidence that probiotics reduce negative mood, starting after two weeks, based on daily monitoring, but few other changes. Our findings reconcile inconsistencies of previous studies, revealing that commonly used pre- versus post-intervention assessments cannot reliably detect probiotic-induced changes in healthy subjects' emotional state. We conclude that probiotics can benefit mental health in the general population and identify traits of individuals who derive greatest benefit, allowing future targeting of at-risk individuals.

A longitudinal network analysis of interaction factors among Chinese women at high risk for perinatal depression

OBJECTIVE

Few studies have applied a health ecological model to understand perinatal depression among high-risk women, and existing research remains primarily cross-sectional in nature. This study aimed to explore the interplay among family function, perceived stress, insomnia symptoms, cognitive reactivity subscales (such as hopelessness/suicidality, aggression, control/perfectionism, avoidant coping, and acceptance/coping), mindfulness subscales (including attention, present focus, awareness, and acceptance), physiological indicators (e.g., hgb, 25-hydroxyvitamin D, and HbA1C), and depressive symptoms in Chinese high-risk women during the perinatal period.

DESIGN

This was a longitudinal population-based cohort study.

SETTING

This two-wave prospective study was conducted in Fujian Province, China, from December 2021 to January 2023.

PARTICIPANTS

We used convenience sampling to enroll 368 pregnant patients from obstetrical clinics and inpatient departments of three tertiary hospitals (level 3) in Fuzhou and Quanzhou City, Fujian Province, China.

MEASUREMENTS AND FINDINGS

In the statistical analysis, cross-sectional data were analyzed via the contemporaneous network method, and longitudinal data were analyzed via the cross-lagged panel network method. The core symptoms in the depression-related symptom network during the third trimester and three months postpartum were identified as attention (ATT) (strength = 1.02) and acceptance/coping (ACC) (strength = 1.19). All bridge symptoms were shown as depression (EPDS) (bridging strength = 0.07 and 0.09). A comparison between the first and second survey networks showed a reduced edge weight for the association between depressive symptoms and insomnia symptoms (to 0 in the second survey network, diff = -0.18, P < 0.001). Conversely, the association between depressive symptoms and control/perfectionism increased to 0.252 (diff = 0.25, P < 0.001). Through cross-lagged panel network analysis, the EPDS (out strength = 3.68, OEI =3.60) was identified as the most influential symptom and the most predictable symptom (R² = 0.76). Perceived stress (PSS) (in strength = 2.49) and hopelessness/suicidality (HOP) (IEI = 1.96) were identified as the most susceptible symptoms.

KEY CONCLUSIONS

Cross-sectional network analysis combined with longitudinal network analysis revealed the mechanism of action between symptoms. Attention (ATT) and acceptance/coping (ACC) were identified as the core symptoms in the network of depression-related symptoms during the third trimester and three months postpartum, and the bridge symptoms were both depression (EPDS). In the dynamic network, depression (EPDS) was identified as the most influential and predictable symptom, and perceived stress (PSS) and hopelessness/suicidality (HOP) were identified as the most susceptible symptoms.

IMPLICATIONS FOR PRACTICE

Targeted interventions focused on attention and coping can reduce stress during pregnancy and enhance postpartum well-being. Strengthening family support and routine screening for symptoms such as stress and depression (EPDS) are crucial for improving maternal mental health globally, particularly in resource-limited settings.

Effects of Rumination and Mindful Self-Focus Inductions During Daily Life in Patients With Remitted Depression: An Experimental Ambulatory Assessment Study

Rumination has been proposed as an important risk factor for depression, whereas mindful attention is considered a protective form of self-focusing. Experimental studies have demonstrated differential effects of these modes when induced in the lab. However, their impact on daily life processes is poorly understood, particularly in individuals vulnerable to depressive relapses. The aim of our study was to examine short- and longer-term effects of repeated brief rumination and mindful self-focus inductions during daily life on momentary mood, cognitions, and cortisol in patients with remitted depression (rMDD) as well as in healthy individuals, and to identify their potential differential effects in these groups. The study involved repeated short ambulatory inductions of a ruminative or a mindful self-focus during daily life with additional assessments of momentary mood, rumination, self-acceptance, and cortisol over 4 consecutive days in a sample of patients with rMDD (n = 32, ≥2 lifetime episodes, age 19-55 years) and matched healthy controls (n = 32, age 21-54 years). Multilevel models revealed differential immediate effects of the two induction modes on all momentary mood and cognitive outcomes (all p's < .001), but not on cortisol. Detrimental effects of rumination over mindful self-focus inductions were particularly strong for cognitions in the patient group. Longer-term effects of the inductions over the day were lacking. This study underlines immediate deteriorating effects of an induced ruminative compared to a mindful self-focus on momentary mood and cognitions during daily life in patients with rMDD and in healthy individuals. The observed stronger rumination-related reactivity in patients suggests heightened cognitive vulnerability. Understanding rumination- and mindfulness-based mechanisms of action in real-life settings can help to establish mechanism-based treatment options for relapse prevention in depression.

Supporting routine cognitive reactivity assessment during the perinatal period: psychometric testing of the Chinese version of the Leiden Index of Depression Sensitivity

BACKGROUND

It is critical to find optimal forms to identify perinatal depression (PND) and its vulnerable factors and make them more applicable to depression screening. This study aims to evaluate the reliability and validity of the Chinese version of the Leiden Index of Depression Sensitivity (LEIDS-RR-CV) among perinatal women in China and determine the cut-off values for screening for high-risk depression.

METHODS

Women in their third trimester of pregnancy and six weeks postpartum completed the LEIDS-RR-CV and a diagnostic reference standard online. We assessed the LEIDS-RR-CV using classical test theory (CTT) and item response theory (IRT). We also assessed the test performance for cut-off scores using receiver operator characteristic analysis to further screen for high-risk depression at each time point.

RESULTS

In total, 396 (third trimester) and 321 (six weeks postpartum) women participated. Cronbach's alpha, two-week test-retest reliability, and marginal reliability for the scale were all greater than 0.8. It showed a five-factor model; the cut-off values were 58 (third trimester) and 60 (six weeks postpartum). The areas under the curve were acceptable (≥ 0.7), and the LEIDS-RR-CV was positively correlated with the total Edinburgh Postnatal Depression Scale (EPDS) score (r = 0.52 and 0.56, p = 0.00), indicating its predictive validity. An IRT analysis further confirmed its discriminative validity.

CONCLUSIONS

The LEIDS-RR-CV was found to be reliable, valid, and can be used to quantify cognitive reactivity among perinatal Chinese women and for screening for high-risk depression during this period.

Between- versus within-person emotional and cognitive reactivity in relation to depressive symptoms

BACKGROUND

Theories connecting depression to emotional reactivity (ER) or cognitive reactivity (CR) have not clearly indicated whether ER and CR are between-person or within-person constructs. Most empirical tests of these theories have focused on either between- or within-person operationalizations of these constructs, but not both. Between- and within-person studies address qualitatively different questions and often generate very different results. Consequently, the goals of the current study were to examine the relation of depressive symptoms to both between- and within-person operationalizations of both ER and CR.

METHODS

Participants were 160 undergraduate students who completed daily diary measures (assessing stress, negative emotions, and negative cognitions) and measures of depressive symptoms. Multilevel modeling (MLM) enabled examination of depressive symptoms to the within- and between-person components of ER and CR.

RESULTS

Depressive symptoms were positively related to within-person ER and CR but not to between-person operationalizations of ER and CR.

LIMITATIONS

The sample only included college students and only assessed depressive symptoms, not clinical diagnoses of major depression.

CONCLUSIONS

Important implications emerge for theory, practice, and future research. We recommend distinguishing between-person from within-person dimensions of ER and CR in future research.

Emotion Differentiation in Current and Remitted Major Depressive Disorder

People with current major depressive disorder (MDD) experience diminished emotion differentiation. We tested the hypothesis that this emotional disturbance is chronic and also characterizes those whose MDD has remitted. As our main aim, we examined emotion differentiation in conjunction with elevated negative and diminished positive emotional intensity, which are both cardinal symptoms of MDD. As an exploratory aim, we examined the predominant theoretical conceptualization that people low in emotion differentiation use more general state terms (e.g., bad) and fewer emotion terms (e.g., anger) to describe their emotional experience. Participants (assessed via diagnostic interview) included individuals who had current MDD (current depressed; n = 48), individuals whose MDD was in full remission (remitted depressed; n = 80), and healthy controls (n = 87). Participants also completed two self-report measures of depressive symptoms and reported momentary emotion repeatedly for 14 days via experience sampling, from which we computed emotion differentiation (i.e., intraclass correlation coefficient) and emotional intensity (i.e., average of the mean emotion ratings across surveys). Finally, participants described a momentary emotional experience via an open-response format, which was coded for the use of general state and emotion terms. Compared to the healthy control group, the current and remitted depressed groups showed similarly low levels of negative and positive emotion differentiation. These findings suggest that diminished emotion differentiation may be a stable characteristic of depressive disorders and a possible target for future prevention efforts. Diminished negative emotion differentiation was significantly associated with higher depressive symptoms as assessed by only one of the depression measures, though this finding did not hold after adjusting for negative emotional intensity. Finally, participants’ emotion differentiation was not associated with use of general state and emotion terms, and groups did not use general state and emotion terms in ways that were consistent with the predominant theoretical conceptualization of emotion differentiation, suggesting the need for clarification in this research domain.

Cognitive reactivity among high-risk individuals at the first and recurrent episode of depression symptomology: A structural equation modelling analysis

Understanding the particular mechanisms by which vulnerability and capability factors influence cognitive reactivity (CR) can contribute to an enhanced capacity to adequately react to depression. However, few studies have explored the CR model. The main aim of the present study was to develop a model that specifies the predictive effects of CR for depression among individuals at high risk for first-episode and recurrent depression. A national cross-sectional, online study using convenience sampling was conducted among 587 vulnerable healthy individuals and 224 depressed patients in China. A battery of indices, including measures of CR, social support, resilience, self-compassion, life events, neuroticism, sleep condition, and negative emotion, were collected. A structural equation model was applied to analyse the data. The final first-episode and recurrent depressive symptoms of the CR models showed good model fit. According to the models, 45%-52% of the variance in depressive symptom was predicted by CR. Social support, self-compassion, resilience, and positive life events directly influenced CR, with β values ranging from -0.18 to -0.24 (P < 0.01). Neuroticism, negative emotion, poor sleep conditions, and negative life events also directly and positively influenced CR (P < 0.01). The relationship between these negative or positive contributing factors and depression was also indirectly influenced by CR (P < 0.01). Our findings demonstrate the role of CR in the prevention and treatment of depression. The first-episode and recurrent depressive symptoms of the CR models considering both vulnerabilities and capabilities of CR in the psychopathology of depression provide a theoretical basis for interventions that reduce CR in high-risk populations.

Cognitive reactivity to low positive and high negative affect

Cognitive Reactivity (CR), an established diathesis for depression, has been defined as the within-person strength of association between sad affect and dysfunctional attitudes. Watson and Tellegen (1985) proposed that sad affect is a combination of high negative affect (NA) and low positive affect (PA). The current study integrated the CR and the affect literatures by examining the differential and conjoint roles of cognitive reactivity to high negative affect (CR-highNA) and cognitive reactivity to low positive affect (CR-lowPA). In the current study, college student participants completed daily diary measures of CR-highNA, CR-lowPA, and CR to sadness (CR-Sad). Results showed that naturally occurring NA and PA accounted for the relation of sadness to dysfunctional cognitions. Further, the relation of depressive symptoms to CR-Sad was explained by high levels of CR-highNA and CR-lowPA. Born out of the integration of research on CR and affective structures, the current results have implications for both theory and treatment of depression.

Factors influencing cognitive reactivity among young adults at high risk for depression in China: a cross-sectional study

Background

Understanding the factors influencing cognitive reactivity (CR) may help identify individuals at risk for first episode depression and relapse and facilitate routine access to preventative treatments. However, few studies have examined the relationship between CR and depression in Asian countries. This study was performed to assess the current status of CR among Chinese young adults and explore influencing factors.

Methods

A national cross-sectional online study using convenience sampling was conducted among 1597 healthy young adults in China (response rate: 93.94%) with a mean age of 24.34 (SD = 5.76) years.

Results

The mean CR score was 51.36 ± 18.97 (range 0–130). Binary logistic regression showed that a low level of CR was associated with the following factors: high self-compassion, high social support, high resilience, high monthly household income, and living in a rural area, with odds ratios (ORs) ranging from 0.14 to 0.70. Young adults in full-time employment, experiencing poor sleep, with high neuroticism, who reported frequent sad mood, and who had a high intensity of negative life events had increased CR to depression, with ORs ranging from 1.18 to 6.66. The prediction probability of these factors was 75.40%. Causal relationships among the influencing factors and CR could not be explored.

Conclusions

The self-reported CR levels among Chinese young adults were moderate. Enhancing self-compassion, resilience, and social support for young adults and reducing negative life events, neuroticism, and poor sleep may help decrease CR. These findings may help healthcare providers or researchers determine how to cultivate and improve the CR of young adults by establishing documented policies and/or improving intervention efficacies.

Adaptation and validation of the Chinese version of the modified Leiden index of depression sensitivity

BACKGROUND

The revised Leiden index of depression sensitivity (LEIDS-RR) is commonly used worldwide to measure a marker of depression vulnerability termed cognitive reactivity (CR). However, the optimal cut-off scores for this scale and for the Chinese version of LEIDS-RR (LEIDS-RR-CV) are unknown.

OBJECTIVES

The main aims were to examine the psychometric properties of the LEIDS-RR and establish appropriate cut-off scores for the Chinese population.

METHODS

Psychometric evaluation was performed for 330 healthy individuals and 330 depression patients in remission, by incorporating classical test theory and item response theory (IRT) methods. Receiver operating characteristic curve analysis was used to determine the optimal LEIDS-RR-CV cut-off.

RESULTS

Cronbach's α, two-week test-retest reliability, and marginal reliability for the LEIDS-RR-CV were 0.92, 0.40, and 0.96, respectively. Confirmatory factor analysis validated the five-factor model, and the cut-off values to screen a population at risk of depression were 60 and 55 for the healthy individuals and patients, respectively. Patients had higher CR than healthy individuals (t = 6.10, p = 0.00), and this was positively correlated with the total CES-D Scale score (r = 0.52, p = 0.00), also confirmed by IRT analysis, indicating the discriminative and concurrent validity of the scale.

LIMITATIONS

The generalizability of these findings may be limited given the sampling method and the fact that all patients were recruited from a tertiary hospital.

CONCLUSIONS

The 26-item LEIDS-RR-CV is a reliable and valid instrument to assess CR in Chinese populations. It can be used for screening at-risk populations and in epidemiological studies to guide the development of tailored intervention strategies.

Gut feelings: A randomised, triple-blind, placebo-controlled trial of probiotics for depressive symptoms

BACKGROUND

Depression is the leading cause of disability worldwide; with evidence suggesting that decreased gut barrier function and inflammation are correlated with depressive symptoms. We conducted a clinical trial to determine the effect of consumption of probiotic supplements (Winclove's Ecologic® Barrier) on depressive symptoms in a sample of participants with mild to severe depression.

METHOD

71 participants were randomly allocated to either probiotic or placebo, which was, consumed daily over eight weeks. Pre- and post-intervention measures of symptoms and vulnerability markers of depression as well as gut microbiota composition were compared. Clinical trial participants were also compared on psychological variables and gut microbiota composition to a non-depressed group (n = 20).

RESULTS

All clinical trial participants demonstrated improvement in symptoms, suggesting non-specific therapeutic effects associated with weekly monitoring visits. Participants in the probiotic group demonstrated a significantly greater reduction in cognitive reactivity compared with the placebo group, particularly in the mild/moderate subgroup. Probiotics did not significantly alter the microbiota of depressed individuals, however, a significant correlation was found between Ruminococcus gnavus and one depression metric.

LIMITATIONS

There was a high attrition rate, which may be attributed to weekly monitoring visits. Additionally, modulation of the gut microbiota may need more specific testing to distinguish subtle changes.

CONCLUSIONS

While microbiota composition was similar between all groups, probiotics did affect a psychological variable associated with susceptibility to depression. Further research is needed to investigate how probiotics can be utilised to modify mental wellbeing, and whether they can act as an adjunct to existing treatments.

Emotional Biases and Recurrence in Major Depressive Disorder. Results of 2.5 Years Follow-Up of Drug-Free Cohort Vulnerable for Recurrence

An interesting factor explaining recurrence risk in Major Depressive Disorder (MDD) may be neuropsychological functioning, i.e., processing of emotional stimuli/information. Negatively biased processing of emotional stimuli/information has been found in both acute and (inconclusively) remitted states of MDD, and may be causally related to recurrence of depression. We aimed to investigate self-referent, memory and interpretation biases in recurrently depressed patients in remission and relate these biases to recurrence. We included 69 remitted recurrent MDD-patients (rrMDD-patients), 35-65 years, with ≥2 episodes, voluntarily free of antidepressant maintenance therapy for at least 4 weeks. We tested self-referent biases with an emotional categorization task, bias in emotional memory by free recall of the emotion categorization task 15 min after completing it, and interpretation bias with a facial expression recognition task. We compared these participants with 43 never-depressed controls matched for age, sex and intelligence. We followed the rrMDD-patients for 2.5 years and assessed recurrent depressive episodes by structured interview. The rrMDD-patients showed biases toward emotionally negative stimuli, faster responses to negative self-relevant characteristics in the emotional categorization, better recognition of sad faces, worse recognition of neutral faces with more misclassifications as angry or disgusting faces and less misclassifications as neutral faces (0.001 < p < 0.05). Of these, the number of misclassifications as angry and the overall performance in the emotional memory task were significantly associated with the time to recurrence (p ≤ 0.04), independent of residual symptoms and number of previous episodes. In a support vector machine data-driven model, prediction of recurrence-status could best be achieved (relative to observed recurrence-rate) with demographic and childhood adversity parameters (accuracy 78.1%; 1-sided p = 0.002); neuropsychological tests could not improve this prediction. Our data suggests a persisting (mood-incongruent) emotional bias when patients with recurrent depression are in remission. Moreover, these persisting biases might be mechanistically important for recurrence and prevention thereof.