Are cavum septum pellucidum abnormalities more common in schizophrenia spectrum disorders? A systematic review and meta-analysis.

Magnetic resonance imaging (MRI) studies have reported a variety of brain abnormalities in association with schizophrenia. These include a higher incidence of cavum septum pellucidum (CSP), which is consistent with a neurodevelopmental model for this disorder. In this meta-analytic review, we describe and discuss the main CSP MRI findings in schizophrenia spectrum disorders (SSDs) to date. We adopted as keywords cavum and schizophrenia or psychosis, and the inclusion criteria were articles in English, with samples of SSD patients compared to healthy subjects, which used MRI to assess CSP, without time limit. From 18 potential reports, fifteen were eligible to be part of the current review. These studies included 1054 patients with SSD and 866 healthy volunteers. Six out of 15 studies pointed to a higher prevalence of CSP of any size in SSD patients, while five out of 15 showed that subjects with SSD had a greater occurrence of a large CSP than healthy individuals. However, the meta-analysis demonstrated that only the incidence of a large CSP was significantly higher in SSD relative to healthy comparisons (odds ratio=1.59; 95%CI 1.07-2.38; p=0.02). Overall our results suggest that only a large CSP is associated with SSD while a small CSP may be considered a normal neuroanatomical variation. Our review revealed a large degree of variability in the methods employed across the MRI studies published to date, as well as evidence of publication bias. Studies in large, community-based samples with greater standardization of methods should clarify the true significance of CSP in SSD.

Social anxiety disorder women easily recognize fearfull, sad and happy faces: the influence of gender.

BACKGROUND: It has been suggested that individuals with social anxiety disorder (SAD) are exaggeratedly concerned about approval and disapproval by others. Therefore, we assessed the recognition of facial expressions by individuals with SAD, in an attempt to overcome the limitations of previous studies. METHODS: The sample was formed by 231 individuals (78 SAD patients and 153 healthy controls). All individuals were treatment naïve, aged 18-30 years and with similar socioeconomic level. Participants judged which emotion (happiness, sadness, disgust, anger, fear, and surprise) was presented in the facial expression of stimuli displayed on a computer screen. The stimuli were manipulated in order to depict different emotional intensities, with the initial image being a neutral face (0%) and, as the individual moved on across images, the expressions increased their emotional intensity until reaching the total emotion (100%). The time, accuracy, and intensity necessary to perform judgments were evaluated. RESULTS: The groups did not show statistically significant differences in respect to the number of correct judgments or to the time necessary to respond. However, women with SAD required less emotional intensity to recognize faces displaying fear (p=0.002), sadness (p=0.033) and happiness (p=0.002), with no significant differences for the other emotions or men with SAD. CONCLUSIONS: The findings suggest that women with SAD are hypersensitive to threat-related and approval-related social cues. Future studies investigating the neural basis of the impaired processing of facial emotion in SAD using functional neuroimaging would be desirable and opportune.