Reward functioning in posttraumatic stress disorder, metabolic syndrome, and psychological resilience.

Background: Reward system dysfunction may play a role in the comorbidity of metabolic syndrome (MetS) in posttraumatic stress disorder (PTSD). Psychological resilience, through its effects on the reward system, may modulate outcomes in PTSD. Utilising a monetary incentive delay task during functional magnetic resonance imaging in a case-control study (PTSD, n = 88, trauma-exposed controls [TEC], n = 85), we aimed to investigate reward system function in relation to PTSD, MetS, and psychological resilience.

Psychiatrists' experiences of involuntary care in South Africa: dilemmas for practice in challenging contexts.

Providing for people with psychosocial conditions in crisis is a complex and controversial endeavour that has gained significant attention over the past decade. This increased focus is driven by global calls to reduce coercion, including by the United Nations Committee on the Rights of Persons with Disabilities, who interpret Article 12 of the United Nations Convention on the Rights of Persons with Disabilities in General Comment 1 to advocate for the replacement of substituted decision-making with supported decision-making. Psychiatrists occupy a central role in determining how to care for and respond to individuals with psychosocial conditions in crisis in the midst of these debates.

Sex versus gender associations with brain structure.

In contrast to sex (a biological distinction), little is known about the associations between gender (a societal construct) and brain structure in the general population. In response to this knowledge gap, we examined the associations of sex vs. gender with FreeSurfer-generated cortical thickness and proportion-adjusted subcortical brain volume regions-of-interest (ROIs) in healthy adults (n = 88) screened for general medical conditions, mental illness, substance abuse, and intracranial pathologies.

Relapse in schizophrenia: The role of factors other than non-adherence to treatment.

Aim: Relapse rates are very high in schizophrenia. However, little is known about the predictors of the time to relapse other than treatment non-adherence. We investigated possible risk factors for the time to relapse in patients with first-episode schizophrenia (n = 107) who received assured treatment by way of long-acting injectable antipsychotic over 24 months and who underwent regular clinical, cognitive, and metabolic assessments.

Association between cannabis use and symptom dimensions in schizophrenia spectrum disorders: an individual participant data meta-analysis on 3053 individuals.

Background: The association between cannabis use and positive symptoms in schizophrenia spectrum disorders is well documented, especially via meta-analyses. Yet, findings are inconsistent regarding negative symptoms, while other dimensions such as disorganization, depression, and excitement, have not been investigated. In addition, meta-analyses use aggregated data discarding important confounding variables which is a source of bias.

Sex, gender, and outcome in first-episode psychosis: The role of premorbid functioning.

We examined the associations of sex (biological distinction) and gender (societal distinction) with psychopathology, depressive symptoms and social and occupational functioning over 24 months. We found that lower masculinity scores were associated with worse psychopathology outcomes, independent of sex and other neurodevelopmental factors. These effects were mediated by poor premorbid adjustment, which also mediated the relationship between childhood trauma and masculinity scores as predictors of disorganized symptom outcomes.

Country-level gender inequality is associated with structural differences in the brains of women and men.

Gender inequality across the world has been associated with a higher risk to mental health problems and lower academic achievement in women compared to men. We also know that the brain is shaped by nurturing and adverse socio-environmental experiences. Therefore, unequal exposure to harsher conditions for women compared to men in gender-unequal countries might be reflected in differences in their brain structure, and this could be the neural mechanism partly explaining women's worse outcomes in gender-unequal countries.

Two Neuroanatomical Signatures in Schizophrenia: Expression Strengths Over the First 2 Years of Treatment and Their Relationships to Neurodevelopmental Compromise and Antipsychotic Treatment.

Background And Hypothesis: Two machine learning derived neuroanatomical signatures were recently described. Signature 1 is associated with widespread grey matter volume reductions and signature 2 with larger basal ganglia and internal capsule volumes. We hypothesized that they represent the neurodevelopmental and treatment-responsive components of schizophrenia respectively.

Differences in white matter microstructure in first-episode schizophrenia spectrum disorders vs healthy volunteers and their association with cognition.

Objective: Both cognitive impairment and alterations in white matter tissue microstructure are well recognised in schizophrenia. We investigated whether differences in white matter microstructure underpin cognitive impairments in patients with first-episode schizophrenia spectrum disorders when controlling for multiple confounding factors.

Methods: We employed a cross-sectional study design and compared fractional anisotropy (FA) between individuals diagnosed with first- episode schizophrenia spectrum disorders (FES) (n = 68) and matched healthy controls (n = 120).

Depressive symptoms and quality of life prior to metabolic surgery in Cape Town, South Africa.

Background: Depression has been shown to have a negative impact on the outcomes of metabolic surgery and quality of life (QOL). Currently, there are limited data on mental distress and QOL in metabolic surgery candidates in South Africa.

Aim: This study aimed to determine the prevalence of depressive symptoms at the time of presurgical assessment in participants undergoing metabolic surgery.

The 3-year progression of clinically significant psychotic-like experiences in a general adult population in Lagos, Nigeria.

Purpose: The study assessed the 3-year progression of clinically significant psychotic-like experience (CS-PLE) symptoms in an adult general population in terms of stability or remission of symptoms and transition to psychosis.

Methods: Participants (n = 1292) aged 18-65 years with CS-PLE were assessed at baseline for sociodemographic details, family history of mental illness, functioning status, common mental disorders, alcohol, and substance use disorders. Three years later they were reassessed for diagnosis of psychosis, presence or remission of PLE symptoms, and contact with mental health services.

Associations between BMI and brain structures involved in food intake regulation in first-episode schizophrenia spectrum disorders and healthy controls.

Structural brain differences have been described in first-episode schizophrenia spectrum disorders (FES), and often overlap with those evident in the metabolic syndrome (MetS). We examined the associations between body mass index (BMI) and brain structures involved in food intake regulation in minimally treated FES patients (n = 117) compared to healthy controls (n = 117). The effects of FES diagnosis, BMI and their interactions on our selected prefrontal cortical thickness and subcortical gray matter volume regions of interest (ROIs) were investigated with hierarchical multivariate regressions, followed by post-hoc regressions for the individual ROIs.

Antipsychotic treatment effects and structural MRI brain changes in schizophrenia.

Background: Progressive brain structural MRI changes are described in schizophrenia and have been ascribed to both illness progression and antipsychotic treatment. We investigated treatment effects, in terms of total cumulative antipsychotic dose, efficacy and tolerability, on brain structural changes over the first 24 months of treatment in schizophrenia.

Methods: A prospective, 24-month, single-site cohort study in 99 minimally treated patients with first-episode schizophrenia, schizophreniform and schizoaffective disorder, and 98 matched healthy controls.

Childhood trauma exposure and reward processing in healthy adults: A functional neuroimaging study.

The association between childhood trauma exposure and risk of developing psychopathology may in part be mediated by the effects of chronic stress on dopaminergic neurotransmission. However, little is known about the differential effects of distinct trauma types on reward processing, particularly in adults without concurrent medical or psychiatric disorders. We examined the association of childhood trauma exposure, including the differential effects of abuse and neglect, with reward processing in healthy adults (n = 114).

Sex and gender associations with indicators of neurodevelopmental compromise in schizophrenia spectrum disorders.

Background: It has been proposed that sex and gender differences described in schizophrenia can be explained from a neurodevelopmental perspective.

Aim: In this study, we examined the associations of biological sex and gender role endorsement with putative indicators of neurodevelopmental compromise.

Methods: We used the Bem Sex Role Inventory to calculate masculinity scores in 77 patients with a first episode of a schizophrenia spectrum disorder, and selected the following indicators of neurodevelopmental compromise: family history of schizophrenia, obstetric complications, premorbid functioning, neurological soft signs, and cognitive function.

The trajectories and correlates of two negative symptom subdomains in first-episode schizophrenia.

Background: Recent studies suggest a two-factor structure for negative symptoms as assessed by the Positive and Negative Syndrome Scale (PANSS) in schizophrenia, namely experiential and expressive subdomains. Little is known about their clinical correlates and treatment trajectories.

Objectives: We sought to replicate the two factor-analysis derived subdomains for PANSS negative symptoms in schizophrenia and to assess their independent demographic, premorbid and treatment-related characteristics.

The associations of cannabis and methamphetamine use with cognitive performance over the first 2 years of treatment in schizophrenia spectrum disorders.

Aim: Cognitive deficits are a core feature of schizophrenia, and comorbid substance use may be a contributory factor. Methamphetamine use has been associated with cognitive impairment in schizophrenia, while associations with cannabis use are less clear-cut. This study aimed to investigate the associations of cannabis and methamphetamine use with cognitive performance in first-episode schizophrenia spectrum disorders over the first 2 years of treatment.

Erratum: Extrapyramidal side effects in first-episode schizophrenia treated with flupenthixol decanoate.

[This corrects the article DOI: 10.4102/sajpsychiatry.v27i0.