父母冲突、青少年的认知评价及其与青少年社会适应的关系

以446名小学五年级至初中二年级的学生为被试,采用问卷法,让被试报告父母冲突形式、内容,对父母冲突的认知评价,以及抑郁、焦虑、自尊、学习问题和不良行为,以探讨父母冲突形式和内容、青少年对冲突的评价与其社会适应的关系,并检验认知评价在父母冲突与青少年适应间的中介作用。结果发现：（1）男女生除在父母情绪冲突和自尊方面的报告有显著差异外,其余各个方面都没有显著差异;随年级升高,儿童知觉的父母冲突内容显著增多,抑郁情绪、学习问题显著增多,而自尊水平显著下降;（2）父母冲突的不同形式和内容,以及青少年对父母冲突的不同认知评价可以预测青少年不同方面的社会适应;（3）认知评价在父母冲突与青少年的内部适应中起中介作用,但在父母冲突与青少年的外部适应中不起中介作用。     

Synergies and Motor Equivalence in Voluntary Sway Tasks: The Effects of Visual and Mechanical Constraints

The authors used two analyses developed within the framework of the uncontrolled manifold hypothesis to quantify multimuscle synergies during voluntary body sway: analysis of intertrial variance and analysis of motor equivalence with respect to the center of pressure (COP) trajectory. Participants performed voluntary sway tasks in the anteroposterior direction at 0.33 and 0.66 Hz. Muscle groups were identified in the space of muscle activations and used as elemental variables in the synergy analyses. Changing mechanical and vision feedback–based constraints led to significant changes in indices of sway performance such as COP deviations in the uninstructed, mediolateral direction and indices of spontaneous postural sway. In contrast, there were no significant effects on synergy indices. These findings show that the neural control of performance and of its stability may involve different control variables and neurophysiological structures. There were strong correlations between the indices of motor equivalence and those computed using the intercycle variance analysis. This result is potentially important for studies of patients with movement disorders who may be unable to perform multiple trials (cycles) at any given task, making analysis of motor equivalence of single trials a viable alternative to explore changes in stability of actions.     

Review of Ordering Don’t Resuscitate in Iranian Dying Patients

Making decision on not to resuscitate is a confusing, conflicting and complex issue and depends on each country’s culture and customs. Therefore, each country needs to take action in accordance with its cultural, ethical, religious and legal contexts to develop guidelines in this regard. Since the majority of Iran’s people are Muslims, and in Islam, the human life is considered sacred, based on the values of the community, an Iranian Islamic agenda needs to be developed not taking measures about resuscitation of dying patients. It is necessary to develop an Iranian Islamic guidelines package in order to don’t resuscitate in dying patients.     

Influence of Zn incorporation on the microstructural and magnetic properties of La0.67Sr0.33Mn1−xZnxO3 nanoparticles synthesised by the sol–gel method

Perovskite manganite nanoparticles with the chemical formula La_0.67Sr_0.33Mn_1?xZn_xO₃ (x = 0, 0.1 and 0.2) were prepared by the sol–gel process and the influence of Zn substitution on their microstructural and magnetic properties studied in detail. X-ray diffractometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed for crystal structure determination and microstructural analysis. The results of XRD analysis confirmed the polycrystalline nature and rhombohedral crystal structure with space group R(-3c) for all compositions. SEM micrographs of the samples revealed an agglomeration/well-connected appearance of the particles. The composition and uniform distribution of all the elements were established by energy-dispersive spectroscopy. TEM images clearly confirmed an almost spherical shape of the nanoparticles with an average particle size of about 11, 14 and 13 nm for the 0, 10 and 20% Zn-doped samples, respectively. The magnetic behaviour of the nanoparticles was studied at room temperature with a vibrating sample magnetometer (VSM) up to a field of 1.8 Tesla. These measurements established a superparamagnetic nature with a variation in the saturation magnetization (M_s) with Zn content.     

An investigation of intra-individual variability in children with fetal alcohol spectrum disorder (FASD)

Intra-individual variability (IIV) is defined as systematic within-person variation in performance either across test sessions (e.g., test/retest performance on the same task) or in one session (e.g., variations in performance on multiple trials of a single task). Higher levels of IIV have been noted as a characteristic of neurodevelopmental disorders such as attention deficit/hyperactivity disorder? (ADHD), but IIV is yet to be investigated in fetal alcohol spectrum disorder (FASD). FASD is a term used to describe a range of conditions resulting from prenatal exposure to alcohol. As part of a comprehensive neuropsychological battery, four study groups (1. fetal alcohol syndrome/partial fetal alcohol syndrome; 2. static encephalopathy/alcohol exposed; 3. neurobehavioral disorder/alcohol exposed as diagnosed using the University of Washington FASD 4-Digit Code; 4. typically-developing (TD) age-matched children with no prenatal alcohol exposure) were administered measures of motor response and inhibitory control, attention, and adaptive behavior. The results indicate increased levels of IIV in those with FASD compared to the TD controls. It was found that IIV uniquely contributes to predicting adaptive behavior above and beyond attention, while attention partially mediates the relationship between IIV and adaptive behavior. This is the first study to the authors’ knowledge to show the presence of increased IIV in children with FASD. It additionally provides evidence that IIV measures some inherent variability in performance independent of poor attention in children with FASD.     

Effects of aging on action-intentional programming

Background: Action-intentional programs control “when” we initiate, inhibit, continue, and stop motor actions. The purpose of this study was to learn if there are changes in the action-intentional system with healthy aging, and if these changes are asymmetrical (right versus left upper limb) or related to impaired interhemispheric communication. Methods: We administered tests of action-intention to 41 middle-aged and older adults (61.9 ± 12.3 years). Results: Regression analyses revealed that older age predicted a decrement in performance for tests of crossed motor response inhibition as well as slower motor initiation with the left hand. Conclusion: Changes in action-intention with aging appear to be related to alterations of interhemispheric communication and/or age-related right hemisphere dysfunction; however, further research is needed to identify the mechanisms for age-related changes in the brain networks that mediate action-intention.     

Scope of Semantic Activation and Innovative Thinking in College Students with ADHD

Adults with attention-deficit/hyperactivity disorder (ADHD) show high divergent thinking on standardized laboratory measures. This study assessed innovative thinking in adults with ADHD using a realistic task and investigated a possible cognitive mechanism for ADHD-related advantages in innovative thinking. College students with and without ADHD (n = 30 per group) completed a cell-phone feature invention task and word association task. Latent semantic analysis was used to measure semantic distance within cue-associate pairs on the word association task. Compared to non-ADHD peers, students with ADHD scored higher in originality, novelty, and flexibility on the cell phone task, and produced associates of lower semantic relatedness on the word association task. Tests of statistical mediation confirmed that the higher flexibility of the ADHD group was explained by semantic distance within cue-associate pairs on the word association task. Results support the possibility that ADHD is positively associated with specific aspects of innovative thinking, which may in part be attributable to a wide scope of semantic activation.     

Relationships of Contextual Factors and Personal Identity to Externalizing Problem Behavior Among Iranian Early Adolescents

In the present study, we evaluated a model of relations among contextual factors (family, school, and peer group), personal identity (i.e., coherence and confusion), and problem behavior among Iranian adolescents. The sample consisted of 765 Iranian adolescents and 615 primary caregivers. Results indicated that family functioning (adolescent report) was related to adolescent problem behavior (a) directly and (b) indirectly through identity confusion. Peer support on the other hand was solely indirectly related to adolescent problem behavior through identity confusion. School functioning was also significantly and negatively related to adolescent problem behavior. The present findings suggest that identity and contextual factors play important roles in steering Iranian adolescents toward or away from behavior problems. Implications for further research are discussed.