Reverse evolution in nanoscale Cu-rich precipitates of an aged Fe–Cu alloy under electropulsing

Nanoscale Cu-rich precipitates (CRPs) are one of the most important microstructural nano-features responsible for embrittlement and hardening of reactor pressure vessels (RPVs), which threaten the safe operation of nuclear power plants (NPPs) and hinder the lifetime extension of nuclear reactors. A thermally aged Fe-1.1 wt.%Cu alloy, which is used to simulate embrittlement of the irradiated RPV steels, was treated by electropulsing with various parameters. The effect of electropulsing on nanoscale CRPs was investigated by using transmission electron microscopy (TEM). Compared to the traditional heat treatment, the electropulsing treatment (EPT) can accelerate the dissolution of CRPs in an aged Fe-Cu alloy on account of the higher atomic drift flux and the additional Gibbs free energy induced by electropulsing. More importantly, EPT is likely to be a new way of eliminating irradiation-induced Cu-rich precipitates.     

Development of the Parent Emotion Regulation Scale (PERS): Factor Structure and Psychometric Qualities

This study aims to develop a self-report measure based on a multidimensional conceptualization of the regulation of negative emotions in the context of parenting. We examined the factor structure, factorial invariance, internal consistency and construct validity of the newly developed measure, the Parent Emotion Regulation Scale (PERS). The sample was composed of 254 mothers of children aged 3 to 15 years old (M?=?8.54, SD?=?3.53) who participated in an online study. Exploratory factor analysis of the PERS yielded a four-factor structure with the following factors: parents’ orientation to the child’s emotions, parents’ avoidance of the child’s emotions, parents’ lack of emotional control and parents’ acceptance of the child’s and their own emotions. Confirmatory factorial analysis supported the four-factor model, showing an adequate fit for this structure. Additionally, the model displayed configural, metric, scalar and residual invariance across the children’s sex groups. Cronbach’s alpha values and mean inter-item correlations indicated an adequate internal consistency. Correlations between the PERS scale and the Coping with Children’s Negative Emotions Scale (CCNES) indicated that the different dimensions of parents’ emotion regulation were significantly associated with both positive and negative reactions to the children’s negative emotions. Furthermore, the emotion regulation dimensions showed incremental validity in the prediction of the child’s adjustment. This study provides preliminary support for the adequacy of this newly developed measure, although further studies are needed to establish its psychometric qualities in more diverse populations.     

The dynamics of multimodal integration: The averaging diffusion model

We combine extant theories of evidence accumulation and multi-modal integration to develop an integrated framework for modeling multimodal integration as a process that unfolds in real time. Many studies have formulated sensory processing as a dynamic process where noisy samples of evidence are accumulated until a decision is made. However, these studies are often limited to a single sensory modality. Studies of multimodal stimulus integration have focused on how best to combine different sources of information to elicit a judgment. These studies are often limited to a single time point, typically after the integration process has occurred. We address these limitations by combining the two approaches. Experimentally, we present data that allow us to study the time course of evidence accumulation within each of the visual and auditory domains as well as in a bimodal condition. Theoretically, we develop a new Averaging Diffusion Model in which the decision variable is the mean rather than the sum of evidence samples and use it as a base for comparing three alternative models of multimodal integration, allowing us to assess the optimality of this integration. The outcome reveals rich individual differences in multimodal integration: while some subjects’ data are consistent with adaptive optimal integration, reweighting sources of evidence as their relative reliability changes during evidence integration, others exhibit patterns inconsistent with optimality.     

人类胚胎干细胞研究伦理问题的调查和讨论

此次对各级医生进行关于人类胚胎干细胞研究伦理认知的调查研究,其目的是为制订相关的伦理准则提供认知依据,调查是在我国东西部二个城市的8家三级医院进行,采用随机抽样、自愿无记名填写信息表方法调查.调查结果表明,50%以上医生认为早期胚胎不是道德意义的人,70%以上医生对胚胎干细胞的研究表示支持.海峡两岸的医生由于有相同的文化根源,在对待胚胎干细胞研究的伦理观点及态度上极其接近.     

社会游戏情境在幼儿遮挡绘画中的作用

该研究以90名4—5岁幼儿为被试,考察了遮挡方式、社会性游戏情境以及年龄对幼儿遮挡绘画的影响,结果表明：(1)幼儿遮挡绘画表征策略的发展不是以“全”或“无”的方式进行的,而是多种策略并存;(2)部分遮挡、完全遮挡这两种遮挡方式的难易程度有很大的差异;(3)设置社会性游戏情境提高了幼儿遮挡绘画的表征策略水平;(4)与年龄相关的成熟水平是影响儿童遮挡绘画表征水平的重要因素。     

In vitro hippocampal gamma oscillation power as an index of in vivo CA3 gamma oscillation strength and spatial reference memory

Neuronal synchronisation at gamma frequencies (30-100 Hz) has been implicated in cognition and memory. Gamma oscillations can be studied in various in vitro models, but their in vivo validity and their relationship with reference memory remains to be proven. By using the natural variation of wild type C57bl/6J mice, we assessed the relationships between reference memory and gamma oscillations recorded in hippocampal area CA3 in vivo and in vitro. Local field potentials (LFPs) were recorded from area CA3 in behaviourally-characterised freely moving mice, after which hippocampal slices were prepared for recordings in vitro of spontaneous gamma oscillations and kainate-induced gamma oscillations in CA3. The gamma-band power of spontaneous oscillations in vitro correlated with that of CA3 LFP oscillations during inactive behavioural states. The gamma-band power of kainate-induced oscillations correlated with the activity-dependent increase in CA3 LFP gamma-band power in vivo. Kainate-induced gamma-band power correlated with Barnes circular platform performance and object location recognition, but not with object novelty recognition. Kainate-induced gamma-band power was larger in mice that recognised the aversive context, but did not correlate with passive avoidance delay. The correlations between behavioural and electrophysiological measures obtained from the same animals show that the gamma-generating capacity of the CA3 network in vitro is a useful index of in vivo gamma strength and supports an important role of CA3 gamma oscillations in spatial reference memory.     

Visual perceptual learning

Perceptual learning refers to the phenomenon that practice or training in perceptual tasks often substantially improves perceptual performance. Often exhibiting stimulus or task specificities, perceptual learning differs from learning in the cognitive or motor domains. Research on perceptual learning reveals important plasticity in adult perceptual systems, and as well as the limitations in the information processing of the human observer. In this article, we review the behavioral results, mechanisms, physiological basis, computational models, and applications of visual perceptual learning.     

The association between infants' self-regulatory behavior and MAOA gene polymorphism

Self-regulatory behavior in early childhood is an important characteristic that has considerable implications for the development of adaptive and maladaptive functioning. The present study investigated the relations between a functional polymorphism in the upstream region of monoamine oxidase A gene (MAOA) and self-regulatory behavior in a sample of Chinese infants at 6 months of age. Self-regulation was assessed by observing infants' behavior of orienting visual attention away from a threatening event in the laboratory situation. The results indicated that regulatory behavior was associated with the functional MAOA gene polymorphism in girls, but not boys. Girls with 4/4 genotypes displayed significantly higher regulation than girls with 3/3 and 3/4 genotypes. The present study provided evidence for gender differences on the role of MAOA gene polymorphism in socioemotional functioning in the early years.     

Priming global and local processing of composite faces: revisiting the processing-bias effect on face perception

We used the composite-face illusion and Navon stimuli to determine the consequences of priming local or global processing on subsequent face recognition. The composite-face illusion reflects the difficulty of ignoring the task-irrelevant half-face while attending the task-relevant half if the half-faces in the composite are aligned. On each trial, participants first matched two Navon stimuli, attending to either the global or the local level, and then matched the upper halves of two composite faces presented sequentially. Global processing of Navon stimuli increased the sensitivity to incongruence between the upper and the lower halves of the composite face, relative to a baseline in which the composite faces were not primed. Local processing of Navon stimuli did not influence the sensitivity to incongruence. Although incongruence induced a bias toward different responses, this bias was not modulated by priming. We conclude that global processing of Navon stimuli augments holistic processing of the face.     

Recruitment of the pre-motor area in human inductive reasoning: An fMRI study

Recent studies indicated that the pre-motor area may be recruited in human higher level cognitive functions, including inductive reasoning. In the present study, a typical task of inductive reasoning, function-finding, was explored using functional MRI. fMRI results showed the significant activation of bilateral pre-motor cortex (BA 6), and its left lateralization. Taking together the previous studies and the present experimental design, we concluded that the left pre-motor cortex in the present study may associate with implicit relation synthesis, while the right pre-motor cortex may reflect spatial information processing involved in arithmetic rules.