The change in perceived motor competence and motor task values during elementary school: A longitudinal cohort study

Participation in motor activities is essential for social interaction and life satisfaction in children. Self‐perceptions and task values have a central position in why children do or do not participate in (motor) activities. Investigating developmental changes in motor self‐perceptions and motor task values in elementary school children would provide vital information about their participation in motor activities. We therefore examined the change in, and associations between, self‐perceptions and task values of fine motor competence, ball competence, and athletic competence in 292 children from kindergarten to grade 4. We also investigated differences between boys and girls, and between children with motor problems and typically developing children. Results indicated that self‐perceptions and task values are domain specific and differ between boys and girls, but not between children with motor problems and typically developing children. Self‐perceptions were not associated with task values. Educators should address specific self‐perceptions to enhance participation into the corresponding motor activities in children between kindergarten and grade 4, and differences in self‐perceptions and task values between boys and girls should be taken into account.     

Timing matters: Length of leave and working mothers' daily reentry regrets

Dealing with developmental tasks in work and family domains is an important challenge for young and middle-aged adults. We investigated a transition that has evolved into a normative task for women, namely, the retransition back to paid work following maternity leave. In a diary study with 149 mothers who had just returned to work, we examined the daily experienced regrets concerning this return. In addition to personal resources (i.e., emotional stability, feeling prepared for the transition) and financial requirements needed to return to work, daily experienced family stress predicted decisional regrets. Moreover, our results suggest that leave length is related to psychological resilience in the face of day-to-day stress experiences: Late returners reported fewer regrets in general and were unaffected by daily family stress. Return-to-work regrets, in turn, were predictive of withdrawal intentions. This underlines the relevancy of the timing of the transition back to work in terms of successful development during this life phase. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Neonatal hippocampal lesion alters the functional maturation of the prefrontal cortex and the early cognitive development in pre-juvenile rats

Mnemonic and executive performance is encoded into activity patterns of complex neuronal networks. Lesion studies revealed that adult recognition memory critically depends on the activation of the prefrontal cortex (PFC) and hippocampus (HP). However, its developmental profile remains poorly elucidated. We previously showed the rat PFC and HP are functionally coupled in theta- and gamma-band oscillations during neonatal [postnatal day (P) 5-8] and pre-juvenile (P10-15) stages of development. Here, we assess the behavioral readout of this early prefrontal-hippocampal activation by investigating the ontogeny and the mechanisms of novelty detection and recognition memory in relationship to the functional integrity of the PFC and HP. Excitotoxic lesion of the HP at birth led to abnormal oscillatory entrainment of the PFC throughout neonatal and pre-juvenile development. Although the onset of novelty detection correlated rather with the maturation of sensory perception and motor skills than with hippocampal integrity, the pre-juvenile performance in item, spatial and temporal order recognition memory significantly decreased after HP lesion at birth. This poorer performance does result neither from abnormal developmental milestones and locomotion nor from increased anxiety. Thus, novelty recognition in rat emerges during the second postnatal week and requires functional integrity of communication within neuronal networks including the PFC and HP.     

Sex differences of salivary cortisol secretion in patients with major depression

Depression is associated with increased cortisol secretion and occurs more often in women than in men. Thus, it has been hypothesized that differences in cortisol secretion might, in part, be responsible for the greater risk of developing depression in women. However, only few studies have examined sex differences in baseline cortisol secretion in depressed patients and healthy controls. We examined sex effects on cortisol secretion in 52 medication-free patients with major depression (37 women, 15 men, mean ± SD age 35 ± 11 years, Hamilton Depression Scale mean score 27 ± 5) and 50 healthy age- and sex-matched control subjects. Salivary cortisol concentrations were measured at 8:00, 12:00, 16:00, and 22:00 h. Repeated measures analysis of covariance revealed a group × sex interaction (p = 0.05). Post hoc tests revealed higher cortisol concentrations in depressed compared to healthy men [F(1;29) = 7.5, p = 0.01]. No differences were found between depressed and non-depressed women. Our results do not support the hypothesis that differences in cortisol secretion between depressed and non-depressed subjects are more pronounced in women than in men. Study characteristics and methods as well as sex-specific confounding variables such as menstrual cycle, menopause and the use of oral contraceptives may account for inconclusive results across studies.     

Differenzielle Effekte klassischer Prädiktoren von Jugendgewalt

Previous studies were able to identify numerous predictors of aggressive and violent behavior in youth. Although it is to be expected that these predictors may behave differently with varying personal and situation-specific characteristics, no study has yet empirically examined whether predictors of youth violence really exhibit differential effects. The current study will fill this gap in the literature by asking how do some predictors of youth violence differ between slightly and highly criminal individuals? To answer this question a representative sample of German students of the ninth class from 2007 and 2008 was used (N?=?44,610). Using the technique of quantile regression the effects of the predictors sex, origin, risk seeking, number of delinquent friends, alcohol consumption, parental violence, interparental violence and violent victimization on the number of violent incidents were analyzed. The results showed that all predictors significantly influenced the number of violent incidents; however, the effects of all predictors also varied significantly with the intensity of criminal activity of offenders. Whereas all predictors were valid for highly criminal individuals, only some predictors also influenced the amount of violent crime in occasionally violent youth. These results have important implications regarding the identification of new predictors, theory building and practice. Additionally, the present approach of studying differential effects might prove useful to psychology and law in general. The more empirical research is individualized, the better this research can also be applied in practice.