Background: Although abnormality of cerebellar-cerebral functional connectivity at rest in obsessive-compulsive disorder (OCD) has been hypothesized, only a few studies have investigated the neural mechanism. To verify the findings of previous studies, a large sample of patients with OCD was studied because OCD shows possible heterogeneity.Methods: Forty-seven medication-free patients with OCD and 62 healthy controls (HCs) underwent resting-state functional magnetic imaging scans. Seed-based connectivity was examined to investigate differences in cerebellar-cerebral functional connectivity in OCD patients compared with HCs. Correlations between functional connectivity and the severity of obsessive-compulsive symptoms were analyzed.Results: In OCD, we found significantly increased functional connectivity between the right lobule VI and the left precuneus, which is a component of the default mode network (DMN), compared to HCs. However, there was no correlation between the connectivity of the right lobule VI-left precuneus and obsessive-compulsive severity.Conclusions: These findings suggest that altered functional connectivity between the cerebellum and DMN might cause changes in intrinsic large-scale brain networks related to the traits of OCD.

Clinical and pharmacological studies of obsessive-compulsive disorder (OCD) have suggested that the serotonergic systems are involved in the pathogenesis, while structural imaging studies have found some neuroanatomical abnormalities in OCD patients. In the etiopathogenesis of OCD, few studies have performed concurrent assessment of genetic and neuroanatomical variables. We carried out a two-way ANOVA between a variable number of tandem repeat polymorphisms (5-HTTLPR) in the serotonin transporter gene and gray matter (GM) volumes in 40 OCD patients and 40 healthy controls (HCs). We found that relative to the HCs, the OCD patients showed significant decreased GM volume in the right hippocampus, and increased GM volume in the left precentral gyrus. 5-HTTLPR polymorphism in OCD patients had a statistical tendency of stronger effects on the right frontal pole than those in HCs. Our results showed that the neuroanatomical changes of specific GM regions could be endophenotypes of 5-HTTLPR polymorphism in OCD.

The number of people with coronavirus disease (COVID-19) has been increasing worldwide. Anxiety about potential infection, fear of severe illness, death, economic problems, and loneliness and isolation brought on by social distancing are increasingly being experienced by people. Therefore, it is imperative to address and improve such mental health-related problems during COVID-19. We aimed to investigate the current mental health care and psychological intervention statuses related to COVID-19 in Japan. In a questionnaire survey, 55 of 69 (80%) mental health and welfare centers and 194 of 931 (21%) psychiatric institutions across Japan responded. COVID-19 patients, their family members, and the general public often consulted the mental health and welfare institutions through telephone. The questionnaire included various information of mental health difficulties related to COVID-19 such as the numbers and contents of the consultations, and the type of the interventions. The contents of consultation included psychological symptoms (anxiety, depression, insomnia, and alcohol problems) and psychosocial problems (interpersonal problems, prejudice, and discrimination). Overall, 9% of mental health and welfare centers provided psychological first aid as psychological intervention and 28% of consultations involved cases requiring urgent care. In Japan, consultations about COVID-19-related mental health problems occurred mainly in mental health and welfare centers. There is urgent need to establish a system that enables mental health triage and brief psychological interventions that are feasible in the centers.

Background: Hoarding disorder (HD) is characterized by cognitive control impairments and abnormal brain activity in the insula and anterior cingulate cortex (ACC) during disposal of personal items or certain executive function tasks. However, whether there are any changes in resting-state functional connectivity of the insula and ACC remains unclear.Methods: A total of 55 subjects, including 24 patients with HD and 31 healthy controls (HCs), participated in the study. We acquired resting-state functional magnetic resonance imaging data and examined group differences in functional connectivity from the insula and ACC in whole-brain voxels.Results: In patients with HD, functional connectivity was significantly lower between the right insula and right inferior frontal gyrus (IFG) and left superior temporal gyrus (STG) compared to HCs. There was no correlation between these connectivities and HD symptoms.Conclusions: Although the clinical implication is uncertain, our results suggest that patients with HD have resting-state functional alterations between the insula and IFG and STG, corresponding with the results of previous fMRI studies. These findings provide new insight into the neurobiological basis of HD.

Decision‐making has been suggested as an endophenotype candidate for obsessive‐compulsive disorder (OCD). However, few studies have examined whether decision‐making under ambiguity is an endophenotype of OCD. This study aimed to investigate decision‐making under ambiguity, as assessed by the Iowa Gambling Task (IGT), in patients with OCD and unaffected first‐degree relatives (UFDR). Forty‐seven non‐medicated, non‐co‐morbid patients with OCD, 30 UFDR, and 47 healthy controls (HC) were compared in terms of decision‐making using the IGT. The correlation between obsessive‐compulsive symptoms and IGT performance was also investigated. Patients with OCD and UFDR performed worse than HC on the IGT. No correlation was found between obsessive‐compulsive symptoms and IGT performance. A deficit in decision‐making under ambiguity may be a trait and an endophenotype candidate for OCD.