Neuroimaging in schizophrenia: an overview of findings and their implications for synaptic changes.

Over the last five decades, a large body of evidence has accrued for structural and metabolic brain alterations in schizophrenia. Here we provide an overview of these findings, focusing on measures that have traditionally been thought to reflect synaptic spine density or synaptic activity and that are relevant for understanding if there is lower synaptic density in the disorder. We conducted literature searches to identify meta-analyses or other relevant studies in patients with chronic or first-episode schizophrenia, or in people at high genetic or clinical risk for psychosis. We identified 18 meta-analyses including over 50,000 subjects in total, covering: structural MRI measures of gyrification index, grey matter volume, grey matter density and cortical thickness, neurite orientation dispersion and density imaging, PET imaging of regional glucose metabolism and magnetic resonance spectroscopy measures of N-acetylaspartate. We also review preclinical evidence on the relationship between ex vivo synaptic measures and structural MRI imaging, and PET imaging of synaptic protein 2A (SV2A). These studies show that schizophrenia is associated with lower grey matter volumes and cortical thickness, accelerated grey matter loss over time, abnormal gyrification patterns, and lower regional SV2A levels and metabolic markers in comparison to controls (effect sizes from ~ -0.11 to -1.0). Key regions affected include frontal, anterior cingulate and temporal cortices and the hippocampi. We identify several limitations for the interpretation of these findings in terms of understanding synaptic alterations. Nevertheless, taken with post-mortem findings, they suggest that schizophrenia is associated with lower synaptic density in some brain regions. However, there are several gaps in evidence, in particular whether SV2A findings generalise to other cohorts.

Google search behaviour relating to perinatal mental wellbeing during the United Kingdom's first COVID-19 lockdown period: a warning for future restrictions.

Infodemiological studies derive public health information from internet activity. Here we compare Google searches of perinatal mental health-related terms during the U.K.'s first COVID-19 lockdown with the corresponding period in 2019. We report evidence of reduced pathologising/recognition of perinatal mental illness; increased perceived maternal inadequacy and estrangement from newborn baby; increased maternal domestic abuse; and increased domestic and substance abuse generally. These insights offer important population-level considerations ahead of further U.K. restrictions, and should be imminently confirmed with epidemiological work.

Psych Socs: student-led psychiatry societies, an untapped resource for recruitment and reducing stigma.

Medical recruitment and retention are national problems. Psychiatry has been more affected than many specialties, as a result of stigma from the public and other healthcare professionals. The Royal College of Psychiatrists has undertaken several initiatives to redress this, notably the 'Choose Psychiatry' campaign. In this editorial we argue that student-led university psychiatry societies are a wonderful but frequently untapped resource to help attract the brightest and best medical students to our profession. We describe the activities of three 'Psych Socs' across the UK and propose next steps to continue this work.

Studies on long term behavioural changes in group-housed rat models of brain and spinal cord injury using an automated home cage recording system.

BACKGROUND: Neurotrauma patients face major neurological sequelae. The failure in the preclinical-to-clinical translation of candidate therapies could be due to poor evaluation of rodent behaviours after neurotrauma. NEW METHOD: A home cage automated system was used to study the long term behaviour of individual rats with traumatic brain injury (TBI), spinal cord injury (SCI) and non-CNS injured controls, whilst group-housed in their home cages. Naïve rats were used as baseline controls. Automated locomotor activity and body temperature recordings were carried out 24 h /day for 3 days/week during 12 weeks post-injury. Behavioural patterns, including aggression, rearing, grooming, feeding and drinking were analysed from automated video recordings during week 1, 6 and 12. RESULTS: SCI animals showed a lower locomotor activity compared to TBI or control animals during light and dark phases. TBI animals showed a higher aggression during the dark phase in the first week post-injury compared to SCI or control animals. Individual grooming and rearing were reduced in SCI animals compared to TBI and control animals in the first week post-injury during the dark phase. No differences in drinking or feeding were detected between groups. Locomotor activity did not differ between naïve male and female rats, but body temperature differ between light and dark phases for both. STANDARD METHODS: Injury severity was compared to standard SCI and TBI behaviour scores (BBB and mNSS, respectively) and histological analysis. CONCLUSIONS: This study demonstrates the practical benefits of using a non-intrusive automated home cage recording system to observe long term individual behaviour of group-housed SCI and TBI rats.