Structure of Al–Co–Ni pentagonal quasicrystal studied by HAADF-STEM and ab initio calculations

Using a combination of atomic-resolution high-angle annular dark-field (HAADF) Z-contrast imaging and ab initio calculations, atomic models of clusters 2 nm in diameter and 0.8 nm in height are proposed for the Al–Co–Ni pentagonal quasicrystal. This quasicrystal has 5-fold symmetry (the so-called 5f state) without superstructures, and is one of numerous modifications of the Al–Co–Ni decagonal quasicrystal. HAADF results reveal that the two-dimensional quasi-periodic lattice contains mainly Penrose pentagonal tiling. The centres within the decorated pentagonal tiles, i.e. the so-called pentagonal super-clusters, show structural characteristics having both a satellite-orbit shape and a pentagon-symmetry shape. The proposed atomic models, based directly on the HAADF images, are subjected to ab initio total energy calculations. After relaxation, the calculations demonstrate that the models with 5-fold symmetry are energetically more favourable than those with 10-fold symmetry.     

Is the Association of ADHD with Socio-Economic Disadvantage Explained by Child Comorbid Externalizing Problems or Parent ADHD?

It has been unclear whether an associations of child ADHD with socio-economic disadvantage (SES) could be accounted for by (a) parental ADHD explaining both low SES and child ADHD, and/or (b) the joint overlap of ODD or CD with low SES and ADHD. Study 1 used a community-recruited case-control sample with detailed evaluation of SES indicators, child ADHD, child externalizing, and parent ADHD symptoms (n = 931 children, 521 ADHD, 577 boys, 354 girls) in a path modeling analysis with latent variables. Study 2 evaluated ADHD and externalizing behavior in a regression model using a poverty index for SES, in 70,927 children (48.2% female) aged 5–17 years from the US 2011–2012 National Survey of Children’s Health (NSCH). In Study 1, lower SES was related to the ADHD latent variable, β = ?.18, p < .001; 95%CI [?.25,-.12]. This effect held when parent ADHD and child ODD and CD were in the model, β = ?.11, p < .01, 95% CI [?.09,-.03], equivalent to OR = 1.50, 95% CI[1.12–2.04]). In Study 2, these results replicated. Adjusting only for age and sex, children from families who were below 200% of the federal poverty line were more likely to have moderate or severe ADHD than no ADHD, versus children above that line, OR = 2.13, 95% CI[1.79,2.54], p < .001. The effect held after adjusting for disruptive/externalizing problems, OR = 1.61, p < .01, 95%CI [1.32,1.96]. The effect size for comparable models was similar across both studies, lending higher confidence to the results. It is concluded that the SES association with child ADHD is not explained by artifact and requires a mechanistic explanation.     

哲学性向、生活事件与精神信仰关系的研究

该文从实证的角度,探讨哲学性向、生活事件与精神信仰的关系。研究表明:1)哲学性向对宗教、神灵、金钱、家族崇拜起负向作用;对政治、国家和民族主义起正向作用。2)生活事件对神灵、生命和家庭起负向预测作用;生活事件通过与哲学性向的交互作用对民族信仰起预测作用。     

中学生科技创造力和课外科技活动关系的测查研究

运用创造性能力测验与中学生课外科技活动调查表,对初中预备班,初二及高二年级学生共２７５名作测查,结果表明：中学生的科技创造力和课外科技活动存在很显著的相关;中学生的科技创造力水平受学校、年级、性别的影响：重点中学优于非重点中学,高二优于初中预备班及初二,男优于女。     

Cerebral White Matter Integrity and Cognitive Aging: Contributions from Diffusion Tensor Imaging

The integrity of cerebral white matter is critical for efficient cognitive functioning, but little is known regarding the role of white matter integrity in age-related differences in cognition. Diffusion tensor imaging (DTI) measures the directional displacement of molecular water and as a result can characterize the properties of white matter that combine to restrict diffusivity in a spatially coherent manner. This review considers DTI studies of aging and their implications for understanding adult age differences in cognitive performance. Decline in white matter integrity contributes to a disconnection among distributed neural systems, with a consistent effect on perceptual speed and executive functioning. The relation between white matter integrity and cognition varies across brain regions, with some evidence suggesting that age-related effects exhibit an anterior–posterior gradient. With continued improvements in spatial resolution and integration with functional brain imaging, DTI holds considerable promise, both for theories of cognitive aging and for translational application.     

连绵词语音类似的启动效应

研究采用快速启动范型考察了视觉连绵词加工中语音的自动激活.两个实验发现,无论是首字同音还是尾字同音启动都可以促进对连绵词的命名反应,且基本不受目标词熟悉性(词频高低)及真假词的影响.可以推断,至少在连绵词--这种单词素词的词汇通达中存在语音的自动激活,这种语音的激活可以说是前词的装配与词水平上的改变.     

驾驶疲劳对听觉注意影响的ERP研究

目的:探讨驾驶疲劳对于听觉注意的影响.方法:采用组间对照,对照组为12名充分休息的出租车司机,实验组为15名连续驾驶10h的司机.采用听觉Oddball范式,标准刺激:800Hz,概率80%;靶刺激:1000Hz,概率10%;新异刺激:计算机产生的噪声或其他声音,概牢10%.声音强度均为85dBL,刺激间隔(SOA)1000ms,刺激呈现时间100ms.要求被试对靶刺激按鼠标反应.结果:P3a分布以额中央区为主,驾驶疲劳后新异刺激引起的P3a潜伏期没有显著变化,幅值显著降低;P3b以中央顶区为主,驾驶疲劳后靶刺激引起的P3b潜伏期没有显著变化,幅值显著降低.结论:驾驶疲劳后听觉非随意注意能力、注意加工能力下降.