An explorative single-arm clinical study to assess craving in patients with alcohol use disorder using Virtual Reality exposure (CRAVE)-study protocol.

BACKGROUND: Alcohol use disorder (AUD) belongs to the most burdensome clinical disorders worldwide. Current treatment approaches yield unsatisfactory long-term effects with relapse rates up to 85%. Craving for alcohol is a major predictor for relapse and can be intentionally induced via cue exposure in real life as well as in Virtual Reality (VR). The induction and habituation of craving via conditioned cues as well as extinction learning is used in Cue Exposure Therapy (CET), a long-known but rarely used strategy in Cognitive Behavioral Therapy (CBT) of AUD. VR scenarios with alcohol related cues offer several advantages over real life scenarios and are within the focus of current efforts to develop new treatment options. As a first step, we aim to analyze if the VR scenarios elicit a transient change in craving levels and if this is measurable via subjective and psychophysiological parameters. METHODS: A single-arm clinical study will be conducted including n = 60 patients with AUD. Data on severity of AUD and craving, comorbidities, demographics, side effects and the feeling of presence in VR will be assessed. Patients will use a head-mounted display (HMD) to immerse themselves into three different scenarios (neutral vs. two target situations: a living room and a bar) while heart rate, heart rate variability, pupillometry and electrodermal activity will be measured continuously. Subjective craving levels will be assessed before, during and after the VR session. DISCUSSION: Results of this study will yield insight into the induction of alcohol craving in VR cue exposure paradigms and its measurement via subjective and psychophysiological parameters. This might be an important step in the development of innovative therapeutic approaches in the treatment of patients with AUD. TRIAL REGISTRATION: This study was approved by the Charité-Universitätsmedizin Berlin Institutional Review Board (EA1/190/22, 23.05.2023). It was registered on ClinicalTrials.gov (NCT05861843).

Enhancing educational and vocational recovery in adolescents and young adults with early psychosis through Supported Employment and Education (SEEearly): study protocol for a multicenter randomized controlled trial.

BACKGROUND: Psychotic disorders often develop a chronic course with devastating consequences for individuals, families, and societies. Early intervention programs for people in the first 5 years after the initial psychotic episode (early psychosis) can significantly improve the outcome and are therefore strongly recommended in national and international guidelines. However, most early intervention programs still focus on improving symptoms and relapse prevention, rather than targeting educational and vocational recovery. The aim of the present study is to explore the effects of Supported Employment and Education (SEE) following the Individual Placement and Support (IPS) model in people with early psychosis. METHODS: The SEEearly trial compares treatment as usual (TAU) plus SEE to TAU alone in outpatient psychiatric settings. The study is a six-site, two-arm, single-blinded, superiority randomized controlled trial (RCT). Participants are randomly assigned (1:1) to the intervention or control group. Aiming to recruit 184 participants, with an assumed drop-out rate of 22%, we will be able to detect a 24% difference in the main outcome of employment/education with 90% power. We make assessments at baseline and at 6- and 12-month follow-ups. Outcome data on employment/education, medication, and current psychiatric treatment is obtained monthly through phone based short assessments. The primary outcome is steady participation for at least 50% of the 12-month follow-up in competitive employment and/or mainstream education. Secondary employment outcomes capture length of employment/education, time to first employment/education, monthly wages/educational attainment, and social return on investment (SROI). Secondary non-employment outcomes include subjective quality of life, psychopathology, substance use, relapse, hospitalization, and functional impairment. To be eligible, participants must be between 16 and 35 years, fulfill diagnostic criteria for early psychosis, and be interested in competitive employment and/or mainstream education. DISCUSSION: In SEEearly, we hypothesize that participants with psychosis, who receive TAU plus SEE, present with better primary and secondary outcomes than participants, who receive TAU alone. Positive results of this study will justify SEE as an evidence-based strategy for clinical routine treatment in people with early psychosis. TRIAL REGISTRATION: SEEearly was registered nationally and internationally in the German Clinical Trials Register (DRKS; identifier: DRKS00029660) on October 14, 2022.

Psychiatric presentations and admissions during the first wave of Covid-19 compared to 2019 in a psychiatric emergency department in Berlin, Germany: a retrospective chart review.

BACKGROUND: Most studies agree that the Covid-19 pandemic and the subsequent lockdown had a negative impact on mental health. On the other hand, international studies have shown that psychiatric emergency departments (pED) experienced a decrease in presentations and admissions. METHODS: Retrospective chart review of all pED presentations and admissions during the first wave of Covid-19 pandemic in Germany (Covid-19 period: 3/2/20 to 05/24/20) in a psychiatric hospital in Berlin compared to 1 year earlier (pre-Covid-19 period). Descriptive statistics and logistic regression were performed. RESULTS: We observed no statistical significant changes in overall pED presentations and overall hospital admissions during the Covid-19 period compared to the pre-Covid-19 period (813 vs. 894, - 9.1%, p = 0.064 and (363 vs. 437, - 16.9%, p = 0.080 respectively). In the subgroup analysis, less patients with depressive disorders (p = 0.035) and with personality disorders (p = 0.002) presented to the pED, a larger number of presentations with schizophrenia was observed (p = 0.020). In the Covid-19 period, less patients with substance use disorder and paranoid schizophrenia were admitted to the hospital via the pED than in the pre-Covid-19 period (p = 0.035 and p = 0.006, respectively). Bed capacity was reduced in the Covid-19 period by - 32.8% (p <  0.001). Presentations in police custody were 13.7% (p = 0.029) higher during the Covid-19 compared to pre-Covid-19 period, with higher rates in female presentations (p = 0.008) and suicide attempts (p = 0.012) and less hospital admissions (p = 0.048). Logistic regression analyses revealed that positive predictors for pED presentation during Covid-19 period were police custody (p <  0.001), being redirected from another hospital (p <  0.001), suicide attempt (p = 0.038), suicidal thoughts (p = 0.004), presentation with paranoid schizophrenia (p = 0.001) and bipolar and manic disorders (p = 0.004), negative predictors were hospital admission (p <  0.001), depressive disorders (p = 0.021) and personality disorders (p <  0.001). CONCLUSIONS: A larger number of presentations in police custody during the Covid-19 period may represent untreated medical needs. This was seen predominantly in female patients, suggesting this subgroup might have suffered particularly under lockdown measures. Patients with paranoid schizophrenia were the only subgroup, which increased in absolute numbers, also suggesting a particular lockdown effect. Reduced bed capacity due to infection curbing measures is suggestive to have played an important role in augmenting the threshold for hospital admissions.

[The application of virtual reality in the treatment of mental disorders]. / Die Anwendung der Virtuellen Realität in der Behandlung psychischer Störungen.

BACKGROUND: Virtual reality (VR) enables immersion in an interactive digital world with realistic experiences, that can be applied for controlled and personalized interventions. This review summarizes the current research on VR in the treatment of mental disorders. METHODS: Selective literature search in PubMed and Google Scholar. RESULTS: An increasing number of publications report the therapeutic application of VR for the treatment of mental disorders. Most VR applications are based on established therapy approaches, such as exposure therapy. According to meta-analytic data, virtual exposure therapy (VRET) for specific phobia and agoraphobia with panic disorder is as effective as traditional in vivo exposure therapy. VRET for the treatment of social phobia is significantly more effective than waitlist and placebo control groups with, however, currently inconsistent metanalytic results when compared to in vivo exposure therapy. VRET for the treatment of posttraumatic stress disorder (PTSD) is similar in effectiveness compared to active psychotherapy. For psychosis, positive results have been reported for the VR-based treatment of auditory verbal hallucinations. For patients with a substance use disorder, VR can induce craving, with still unverified diagnostic and therapeutic relevance. CONCLUSIONS: VRET can broaden the psychotherapy options for anxiety disorders. Encouraging results of VR-based treatments for psychosis and PTSD indicate the need for further research concerning its effectiveness and safety. In the field of substance use disorders, evaluation of clinical-orientated VR applications is needed.

Effect of standardized post-coercion review on subjective coercion: Results of a randomized-controlled trial.

BACKGROUND: Post-coercion review has been increasingly regarded as a useful intervention in psychiatric inpatient setting. However, little is known about its effect on perceived coercion. METHODS: A multicenter, two-armed, randomized controlled trial was conducted, aiming at analyzing the effect of post-coercion review on perceived coercion. People with severe mental disorders, who experienced at least one coercive measure during inpatient treatment, were randomized using Zelen's design to an intervention group receiving standardized post-coercion review, or a control group treated as usual. The MacArthur admission experience scale (AES) and the coercion ladder (CL) were used to assess perceived coercion during inpatient treatment. The coercion experience scale (CES) measured experienced coercion during the coercive intervention. Analyses of covariance were performed to determine group differences. RESULTS: Of 422 randomized participants, n = 109 consented to participate in the trial. A restricted intention-to-treat analysis of all individuals who consented revealed no significant effect of the intervention on perceived coercion. A significant interaction effect between the factors gender and intervention on the AES scores was found. Sensitivity analysis revealed significant effects of the intervention on both AES and CL scores and an interaction effect between intervention and gender, indicating a higher efficacy in women. No effect of the intervention on CES scores was found. CONCLUSIONS: Standardized post-coercion review sessions did not alleviate the subjective perception of coercion in the total sample. However, post hoc analysis revealed a significant effect of the intervention in women. Results indicate the need to further address gender-specific issues related to coercion.

Understanding and breaking the intergenerational cycle of abuse in families enrolled in routine mental health services: study protocol for a randomized controlled trial and two non-interventional trials investigating mechanisms of change within the UBICA II consortium.

BACKGROUND: Parents' mental illness (MI) and parental history of early life maltreatment (ELM) are known to be significant risk factors for poor parenting while poor parenting is a crucial mediator of the intergenerational continuity of child maltreatment. Hence, maltreatment prevention programs for families with an MI parent, which pay particular attention to experiences of ELM in the parent, are urgently needed. Parental mentalizing was previously found to mediate successful parenting. Interventions aimed at improving the parental mentalizing capacity reduced maltreatment risk in parents. The aim of the present study is to investigate the effectiveness of a mentalization-based parenting-counseling in acutely mentally ill parents currently treated at a psychiatric hospital. METHODS: Mentalization-based parenting-counseling (MB-PC) vs. enhanced standard clinical care (SCC+) will be administered in a cluster-randomized-controlled trial (RCT). Patients treated at psychiatric hospitals with children between 1.5 and 15 years will be included in the trial. MB-PC will be administered as a 12-h combined individual and group program enriched by social counseling (over a course of 5 weeks) as add-on to standard clinical care, while the control condition will be standard clinical care plus a 90-min psychoeducation workshop on positive parenting. Primary efficacy endpoint is self-reported parenting practices at follow-up. Embedded within the RCT will be two sub-studies investigating social cognition and dyadic synchrony as biobehavioral mechanisms of change. DISCUSSION: The main goal of the present study is to investigate ways to break the intergenerational continuity of maltreatment by assessing the benefits of a prevention program which aims at improving parenting in vulnerable mothers and fathers. MB-PC is a short, low-cost intervention which can be delivered by nurses and social workers and is applicable to MI patients with children with a broad range of diagnoses. If it is shown to be effective, it can be directly implemented into standard psychiatric hospital care thereby providing help to prevent child maltreatment. TRIAL REGISTRATION: German Clinical Trials Register DRKS00017398 . Registered on 5 July 2019.

[Impact of early life maltreatment of women on the mother-child relationship : Data from mother-child dyads from Heidelberg and Berlin]. / Einfluss früher Gewalterfahrungen von Frauen auf die Mutter-Kind-Beziehung : Daten von Heidelberger und Berliner Mutter-Kind-Dyaden.

Early life maltreatment can have severe and long-lasting consequences for the directly affected individual as well as for the next generation. Data from our research including mother-child dyads from Heidelberg and Berlin show that early life maltreatment is associated with behavioral and neural changes including personality traits and attachment style of the affected mothers that negatively affect their relationship with their child. The children of these mothers affected by early life maltreatment have an elevated risk to be maltreated and to develop mental disorders. They also show a heightened cortisol concentration and a reduced inhibition control. It seems to be of importance whether the mother has experienced early life maltreatment but is resilient, meaning that she has not developed a mental disorder (up to the time of examination) or whether in addition to the early life maltreatment she has developed a mental disorder later in life. Children of mothers with early life maltreatment and a lifetime mental disorder seem to be especially exposed to stress and show the greatest impairments and risks. Based on the existing data from our research practical and clinical implications are discussed and one possible intervention in the form of a training of mentalization competencies for parents is presented.

[Suicidal tendencies in adolescence : Dysfunctional familiar communication as risk factor]. / Suizidalität in der Adoleszenz : Dysfunktionale familiäre Kommunikation als Risikofaktor.

BACKGROUND: Suicide is one of the four most common causes of death in adolescence worldwide. Although it is well known that suicidal people often have insufficient communication strategies, the importance of family communication for adolescent suicidality has not yet been sufficiently explored. OBJECTIVE: The aim of this study was to provide a systematic review of family communication as a risk factor for adolescent suicidal tendencies and to develop treatment recommendations. METHODS: In this study a systematic literature search was conducted in PubMed, Embase, CENTRAL and PsychINFO. The methodological quality of the studies was evaluated and a summary prepared. RESULT: A total of 195 studies were extracted and screened for their suitability. Of these studies, 7 which examined a total of 13,107 adolescents aged 11-22 years were included in this review and critically evaluated. Of the studies evaluated six found a correlative relationship between dysfunctional parent-child communication and adolescent suicidality. Communication with the mother appears to be more essential. CONCLUSION: The results of this literature search indicate that functional communication with parents seems to be protective for suicidal adolescents. From this, recommendations can be derived for preventive measures in families with adolescents who are otherwise at increased risk of suicide. Longitudinal study designs are needed to conclusively answer the research question.

[Influence of staffing levels on conflicts in inpatient psychiatric care]. / Einfluss der Personalbesetzung auf Konflikte auf psychiatrischen Stationen.

Acute psychiatric wards are an important element in the mental healthcare of people at risk for acute harm to others or self-harm. Unfortunately, aggression, violence (conflict) and the use of coercion (containment) are still part of psychiatric care. The decisive factor for the correct handling of these situations is the quantity as well as the quality of the employees. Therefore, the present study dealt with the care situation on acute psychiatric wards. The hypothesis is that both the number of beds on the acute psychiatric ward and the number of caregivers have an impact on the occurrence of conflict and containment. For this purpose, data were collected in 6 clinics on a total of 12 acute psychiatric wards. The Patient Staff Conflict Checklist - Shift Report (PCC-SR) was used as the data entry tool. A total of 2026 shifts (early, late and night shifts) were recorded and evaluated. The staffing of the wards with nursing personnel varied considerably. The results show that both the size of the ward and also the number of caregivers on acute psychiatric wards have a significant impact on the occurrence of conflicts. The results also show that the incidence of conflicting behavior of patients differs both in terms of the wards of the hospitals involved and in the type of service considered. In addition, it can be seen that the extent of closure of an acute ward (i. e. the closed ward or entrance door) and the size of a ward (i. e. the number of beds) have a negative impact on the incidence of inpatient acute psychiatric contexts. The occurrence of conflict behavior can lead to alien or self-endangerment and to a variety of de-escalating and containment measures. This requires appropriate human resources.

[Obsessive-Compulsive Symptoms in a Sample of Patients with Chronic Schizophrenia Under Clozapine Treatment]. / Zwangssymptome bei chronisch erkrankten Patienten mit einer Schizophrenie unter Clozapintherapie.

Background: There is a high prevalence of obsessive-compulsive symptoms (OCS) in patients with schizophrenia. Antipsychotic treatment, especially duration and type of substance, is suspected to increase or even cause OCS. Methods: We examined in a naturalistic cross-sectional study the severity of OCS (Obsessive-Compulsive Inventory - Revised) and the incidence of obsessive-compulsive disorder (OCD) according to ICD-10 criteria in 70 patients with schizophrenia. 26 patients were treated with clozapine and 44 patients were treated with another second-generation antipsychotic (SGA). After group matching, the two groups did not differ significantly in age, gender, duration of illness, treatment duration with the current antipsychotic substance and chlorpromazine-equivalent dosage. Results: Patients treated with Clozapine showed a significantly higher rate of OCD (χ2 = 7.304, p = 0.007) and a significantly higher severity of OCS (t = 2.216, p = 0.037) compared to patients treated with another SGA. For the whole sample, duration of treatment with the current antipsychotic medication correlated significantly (p = 0.033, r = 0.323) with the severity of OCS, controlled for duration of illness. However, there was no significant correlation between severity of OCS and duration of illness, controlled for duration of treatment with the current antipsychotic substance. Discussion: Our data suggest an interrelation between the development of OCS or OCD and antipsychotic treatment, especially clozapine. Thereby, duration of treatment is correlated with the severity of OCS, irrespective of the duration of illness.

Neural alterations of fronto-striatal circuitry during reward anticipation in euthymic bipolar disorder.

BACKGROUND: Bipolar disorder (BD), with the hallmark symptoms of elevated and depressed mood, is thought to be characterized by underlying alterations in reward-processing networks. However, to date the neural circuitry underlying abnormal responses during reward processing in BD remains largely unexplored. The aim of this study was to investigate whether euthymic BD is characterized by aberrant ventral striatal (VS) activation patterns and altered connectivity with the prefrontal cortex in response to monetary gains and losses. METHOD: During functional magnetic resonance imaging 20 euthymic BD patients and 20 age-, gender- and intelligence quotient-matched healthy controls completed a monetary incentive delay paradigm, to examine neural processing of reward and loss anticipation. A priori defined regions of interest (ROIs) included the VS and the anterior prefrontal cortex (aPFC). Psychophysiological interactions (PPIs) between these ROIs were estimated and tested for group differences for reward and loss anticipation separately. RESULTS: BD participants, relative to healthy controls, displayed decreased activation selectively in the left and right VS during anticipation of reward, but not during loss anticipation. PPI analyses showed decreased functional connectivity between the left VS and aPFC in BD patients compared with healthy controls during reward anticipation. CONCLUSIONS: This is the first study showing decreased VS activity and aberrant connectivity in the reward-processing circuitry in euthymic, medicated BD patients during reward anticipation. Our findings contrast with research supporting a reward hypersensitivity model of BD, and add to the body of literature suggesting that blunted activation of reward processing circuits may be a vulnerability factor for mood disorders.

Subjective experience of coercion in psychiatric care: a study comparing the attitudes of patients and healthy volunteers towards coercive methods and their justification.

Under certain conditions, coercive interventions in psychotic patients can help to regain insight and alleviate symptoms, but can also traumatize subjects. This study explored attitudes towards psychiatric coercive interventions in healthy individuals and persons suffering from schizophrenia, schizoaffective or bipolar disorder. The impact of personal history of coercive treatment on preferences concerning clinical management of patients unable to consent was investigated. Six case vignettes depicting scenarios of ethical dilemmas and demanding decisions in favour of or against coercive interventions were presented to 60 healthy volunteers and 90 patients. Structured interviews focusing on experienced coercion were performed in conjunction with the Coercion Experience Scale and the Admission Experience Survey. Symptom severity, psychosocial functioning and insight into illness were assessed as influencing variables. Student's t tests compared patients' and controls' judgments, followed by regression analyses to define the predictive value of symptoms and measures of coercion on judgments regarding the total patient sample and patients with experience of fixation. Patients and non-psychiatric controls showed no significant difference in their attitudes towards involuntary admission and forced medication. Conversely, patients more than controls significantly disapproved of mechanical restraint. Subjective experience of coercive interventions played an important role for the justification of treatment against an individual's "natural will". Factors influencing judgments on coercion were overall functioning and personal experience of treatment effectiveness and fairness. Qualitative and quantitative aspects of perceived coercion, in addition to insight into illness, predicted judgments of previously fixated patients. Results underline the importance of the quality of practical implementation and care, if coercive interventions cannot be avoided.

[Maintenance treatment in opioid-dependent patients with migration background]. / Opioidsubstitution bei heroinabhängigen Patienten mit Migrationshintergrund.

BACKGROUND: No regional analyses regarding opioid-dependent patients in maintenance treatment with a migration background have so far been performed in German-speaking countries. OBJECTIVES: This study examined patients with and without a migration background regarding socioeconomic parameters, characteristics of dependency and attitude towards opiate maintenance treatment (OMT). MATERIAL AND METHODS: From May to October 2011 patients in OMT from all of the 20 psychiatry clinics and 110 physician practices in Berlin with a licence to provide OMT were included in this analysis. RESULTS: Out of the 986 participating patients, 956 gave information on migration background and of these, 204 (21.3 %) originated from a country other than Germany. Compared to patients without a migration background, their participation in a maintenance program was significantly shorter and they more often expressed a desire to end OMT and wanted a limited duration of OMT. CONCLUSION: The differences regarding duration of OMT and the wish to end OMT can reflect a stronger desire for abstinence and a different attitude towards maintenance treatment of patients with a migration background.

Effects of depressive symptoms and peripheral DAT methylation on neural reactivity to alcohol cues in alcoholism.

In alcohol-dependent (AD) patients, alcohol cues induce strong activations in brain areas associated with alcohol craving and relapse, such as the nucleus accumbens (NAc) and amygdala. However, little is known about the influence of depressive symptoms, which are common in AD patients, on the brain's reactivity to alcohol cues. The methylation state of the dopamine transporter gene (DAT) has been associated with alcohol dependence, craving and depression, but its influence on neural alcohol cue reactivity has not been tested. Here, we compared brain reactivity to alcohol cues in 38 AD patients and 17 healthy controls (HCs) using functional magnetic resonance imaging and assessed the influence of depressive symptoms and peripheral DAT methylation in these responses. We show that alcoholics with low Beck's Depression Inventory scores (n=29) had higher cue-induced reactivity in NAc and amygdala than those with mild/moderate depression scores (n=9), though subjective perception of craving was higher in those with mild/moderate depression scores. We corroborated a higher DAT methylation in AD patients than HCs, and showed higher DAT methylation in AD patients with mild/moderate than low depression scores. Within the AD cohort, higher methylation predicted craving and, at trend level (P=0.095), relapse 1 year after abstinence. Finally, we show that amygdala cue reactivity correlated with craving and DAT methylation only in AD patients with low depression scores. These findings suggest that depressive symptoms and DAT methylation are associated with alcohol craving and associated brain processes in alcohol dependence, which may have important consequences for treatment. Moreover, peripheral DAT methylation may be a clinically relevant biomarker in AD patients.

Anticipating agoraphobic situations: the neural correlates of panic disorder with agoraphobia.

BACKGROUND: Panic disorder with agoraphobia is characterized by panic attacks and anxiety in situations where escape might be difficult. However, neuroimaging studies specifically focusing on agoraphobia are rare. Here we used functional magnetic resonance imaging (fMRI) with disorder-specific stimuli to investigate the neural substrates of agoraphobia. METHOD: We compared the neural activations of 72 patients suffering from panic disorder with agoraphobia with 72 matched healthy control subjects in a 3-T fMRI study. To isolate agoraphobia-specific alterations we tested the effects of the anticipation and perception of an agoraphobia-specific stimulus set. During fMRI, 48 agoraphobia-specific and 48 neutral pictures were randomly presented with and without anticipatory stimulus indicating the content of the subsequent pictures (Westphal paradigm). RESULTS: During the anticipation of agoraphobia-specific pictures, stronger activations were found in the bilateral ventral striatum and left insula in patients compared with controls. There were no group differences during the perception phase of agoraphobia-specific pictures. CONCLUSIONS: This study revealed stronger region-specific activations in patients suffering from panic disorder with agoraphobia in anticipation of agoraphobia-specific stimuli. Patients seem to process these stimuli more intensively based on individual salience. Hyperactivation of the ventral striatum and insula when anticipating agoraphobia-specific situations might be a central neurofunctional correlate of agoraphobia. Knowledge about the neural correlates of anticipatory and perceptual processes regarding agoraphobic situations will help to optimize and evaluate treatments, such as exposure therapy, in patients with panic disorder and agoraphobia.

Construction and interpretation of self-related function and dysfunction in Intercultural Psychiatry.

In several psychiatric disorders, key symptoms are associated with aspects of an individual, which are usually referred to as the "self". For example in schizophrenia, it has been suggested that the activity of the self and the distinction between self and others are impaired. However, such models of the self and its dysfunction have been developed among Western societies and may not easily be transferred into different cultural settings, which can be characterized by alternative concepts of a person's self. This study compares traditional Western concepts of the self and its dysfunction with self-concepts developed in Caribbean, African and South-East-Asian societies. This review demonstrates that "the self" is a fluid concept. Social function and dysfunction of such a self-concepts depend on a given cultural context. We argue that the cursive concept of the self is culturally constructed around cursive experiences which are shared by all human beings. Such universal experiences may include the prereflective access to individual thoughts and feelings, an automatic knowledge that (at least in non-pathological states) these emotions and cognitions belong to my self. Conscious self-reflection and its narrative articulation, on the other hand, is necessarily imbued with social and cultural norms, images and events, often of conflicting nature.

[The development of depression: the role of brain-derived neurotrophic factor]. / Entstehung von Depression : Die Rolle des "brain-derived neurotrophic factor"

An association between the presence of psychosocial stress, its pathological processing and the development of depression is well documented. This review reports and discusses studies suggesting a reduced release of brain-derived neurotrophic factor (BDNF) under stress as a possible mechanism. The studies show a reduction of BDNF secretion in stressful situations, a decreased blood concentration in depression and a normalization of BDNF by successful antidepressant therapy. As a possible mechanism of BDNF action, a reactivation of neuroplasticity is being discussed, especially in hippocampal and cortical networks. On the other hand, methodological limitations, such as the impossibility of determining the cerebral BDNF concentration in vivo and ruling out a variety of possible confounders, may restrict the significance of the studies. The question of whether the ascertained changes of BDNF levels are causally involved in the pathophysiology of depression or whether they are just an epiphenomenal result of depression-induced stress is still under debate.

Access of emotional information to visual awareness in patients with major depressive disorder.

BACKGROUND: According to cognitive theories of depression, negative biases affect most cognitive processes including perception. Such depressive perception may result not only from biased cognitive appraisal but also from automatic processing biases that influence the access of sensory information to awareness. METHOD: Twenty patients with major depressive disorder (MDD) and 20 healthy control participants underwent behavioural testing with a variant of binocular rivalry, continuous flash suppression (CFS), to investigate the potency of emotional visual stimuli to gain access to awareness. While a neutral, fearful, happy or sad emotional face was presented to one eye, high-contrast dynamic patterns were presented to the other eye, resulting in initial suppression of the face from awareness. Participants indicated the location of the face with a key press as soon as it became visible. The modulation of suppression time by emotional expression was taken as an index of unconscious emotion processing. RESULTS: We found a significant difference in the emotional modulation of suppression time between MDD patients and controls. This difference was due to relatively shorter suppression of sad faces and, to a lesser degree, to longer suppression of happy faces in MDD. Suppression time modulation by sad expression correlated with change in self-reported severity of depression after 4 weeks. CONCLUSIONS: Our finding of preferential access to awareness for mood-congruent stimuli supports the notion that depressive perception may be related to altered sensory information processing even at automatic processing stages. Such perceptual biases towards mood-congruent information may reinforce depressed mood and contribute to negative cognitive biases.