Introduction. Longitudinal prospective studies are needed to identify risk factors for posttraumatic stress disorder (PTSD) symptoms 15 years after trauma, since cross-sectional findings do not...Show moreIntroduction. Longitudinal prospective studies are needed to identify risk factors for posttraumatic stress disorder (PTSD) symptoms 15 years after trauma, since cross-sectional findings do not inform how a possible pattern change as the clinical condition extends. Recently, thyroid hormones were in the top fifteen most relevant biochemical predictors for PTSD symptom trajectory within one year after trauma. Moreover, peritraumatic distress (PD) is highly associated with PTSD symptom severity. Nevertheless, most studies did not investigate the course of PTSD 15 years after a serious injury. This study hypothesized that higher thyroid functioning acutely after trauma, and higher PD predicted higher 15-year PTSD symptom severity, while the thyroid functioning mediated the relation between PD and 15-year PTSD symptom severity. Methods. This longitudinal prospective study examined 452 serious injury survivors. Blood samples were obtained acutely after trauma, and PD 23 days after trauma. PTSD symptom severity was assessed 15 years after trauma (M = 2.77, SD = 4.64), with the Clinician Administered PTSD Scale. Results. Multiple linear regression analyses showed that 15-year PTSD symptom severity was not predicted by the thyroid hormones and PD, and the thyroid hormones did not mediate the relation between PD and 15-year PTSD symptom severity. Discussion. Our study showed the importance of predicting 15-year PTSD symptoms, since understanding how and when these symptoms occur could be crucial for treatment and promising for risk identification at an early stage. More longitudinal studies are needed to understand why some people do, and others do not develop 15-year PTSD symptoms.Show less
Recent advancements in imaging techniques have enabled the detection of thousands of exoplanets, as well as the characterization of a multitude of protoplanetary disks. These disks are believed to...Show moreRecent advancements in imaging techniques have enabled the detection of thousands of exoplanets, as well as the characterization of a multitude of protoplanetary disks. These disks are believed to form planets, but have mostly been observed around low mass T Tauri stars. No observations of disks around high mass Herbig Be stars exist, raising the question whether planets and especially giant planets can form there. Using archival data from VLT/SPHERE/IRDIS, one of the world’s best direct imagers for exoplanets and protoplanetary disks, we have attempted to image the disk of such a Herbig Be star, MWC147 (alias V700 Mon & HD259431). For this data reduction, a variety of correction techniques are demonstrated and compared against each other. The resulting images reveal the prescence of a second companion, dubbed MWC147 C, and a large bow shaped structure. Furthermore, a model of VLT/SPHERE/ZIMPOL was designed to quantify the effects of instrumental polarization and crosstalk on the polarimetric efficiency of the instrument. Finally, an observing proposal for VLT/SPHERE was written with the goal of obtaining better data of MWC147, such that the bow shaped structure and disk of MWC147 could be better characterized.Show less
Objective To examine the relationship between maternal reflective functioning (RF) and child aggression and whether this relationship is mediated by child’s precursors of Theory of Mind (ToM). The...Show moreObjective To examine the relationship between maternal reflective functioning (RF) and child aggression and whether this relationship is mediated by child’s precursors of Theory of Mind (ToM). The influence of coaching on maternal reflective functioning and child aggression is also examined. Method The sample consisted of 85 mother-infant dyads. Mothers were allocated to a high or low risk group based on maternal characteristics. Half of the high risk mothers were randomly assigned to a coaching group. Maternal reflective functioning was assessed prenatally and when children were 20 months of age by Pregnancy Interview (PI) and Parental Development Interview (PDI). Mothers were asked to aggressive symptoms in their child. Children’s precursors of ToM were measured at 20 months by an imitation task, a visual perspectives task and a discrepant desires task. Results Maternal prenatal reflective functioning was found to be negatively related to child aggressive behaviour. However maternal postnatal self-related RF was positively related to child aggression. In addition, maternal reflective functioning was found to be positively related to one precursor of ToM, but ToM did not mediate the relationship between maternal reflective functioning and child aggression. No effect of coaching on maternal reflective functioning and child aggression was found. Conclusion The present study provides evidence for the relationship between maternal reflective functioning and child aggression at a young age. This emphasizes the importance of well-developed maternal reflective functioning capacities for the behavioural development of children. This relationship could be mediated by child’s ToM, but this should be further researched. Coaching would be a suitable way to enhance maternal reflective functioning capacities, but the effects of coaching should be investigated after mothers received coaching for a longer period of time.Show less
