Avoidance in Adolescence: The Balloon Risk Avoidance Task (BRAT)

Journal of Psychopathology and Behavioral Assessment - A large body of work documents the utility of behavioral risk tasks for making inferences about adolescent risk-taking proclivities and...     

Deviant ERP response to spoken non-words among adolescents exposed to cocaine in utero

Concern for the impact of prenatal cocaine exposure (PCE) on human language development is based on observations of impaired performance on assessments of language skills in these children relative to non-exposed children. We investigated the effects of PCE on speech processing ability using event-related potentials (ERPs) among a sample of adolescents followed prospectively since birth. This study presents findings regarding cortical functioning in 107 prenatally cocaine-exposed (PCE) and 46 non-drug-exposed (NDE) 13-year-old adolescents.PCE and NDE groups differed in processing of auditorily presented non-words at very early sensory/phonemic processing components (N1/P2), in somewhat higher-level phonological processing components (N2), and in late high-level linguistic/memory components (P600).These findings suggest that children with PCE have atypical neural responses to spoken language stimuli during low-level phonological processing and at a later stage of processing of spoken stimuli.     

对角线元素与不同复杂度的系统的关系

<正>对角线方法是指德国学者康托尔 ( G. Cantor) 在证明实数集不可数时所运用的一种技术方法。在这种意义上,康托尔的实数集不可数论本身便是对角线方法的一种重要运用。此外,对角线方法还有两种重要运用,即哥德尔对角线定理和汤姆逊引理的证明。哥德尔对角线定理又叫 "哥德尔自指定     

大型公立医院开展特需医疗服务的思考

随着生活水平的提高,人们的健康需求不断提高,有支付能力的人群不断增多.同时,特需医疗存在巨大的利润空间,使许多大型公立医院争相提供特需医疗服务.但是,大型公立医院作为特需医疗服务的提供主体存在许多的问题,要逐渐使大型公立医院分流,使营利性医院逐步成为特需医疗的主要提供主体.     

男同性恋的身体意象：特点与理论分析

对男同性恋身体意象的研究有近30年的历史。男同性恋比男异性恋更容易出现负面身体意象、身体不满意和进食障碍等。男同性恋追求瘦而有肌肉的理想身体。针对这些特点, 研究者提出一些理论假设进行解释, 包括性客观化理论、内化同性恋污名、性别角色假设、进化心理学假设和AIDS/HIV假设等。未来研究要进行整合的和多样化的研究取向, 方法上采用以网络调查为主的定量研究和以现象学分析为主的定性研究。最后, 国内研究要更注重文化特异性。     

延迟学习判断研究的发展与展望

延迟学习判断是学习判断的一种形式,是指在材料学习完以后间隔一段时间才发生的学习判断。在与即时学习判断的对比研究中发现,延迟学习判断具有较高的相对准确性,这种现象被称为延迟学习判断效应。研究者进行了大量的研究并提出了多种理论来解释这种延迟学习判断效应。随着研究的不断深入,延迟学习判断的研究从研究指标、研究方法甚至是研究的理论基础都在不断更新。延迟学习判断的研究进展,包括主要理论和相关实验,以及最新研究成果将被介绍。最后,文章梳理了延迟JOL的研究进程,并指出了未来的研究方向。     

Investigation of {111} stacking faults and nanotwins in epitaxial BaTiO3 thin films by high-resolution transmission electron microscopy

{111} stacking faults and nanotwins in epitaxial BaTiO₃ thin films on MgO substrates have been investigated by high-resolution transmission electron microscopy. In many cases, the stacking faults and nanotwins were found to be accompanied by partial dislocations. These partial dislocations can be classified as two different types, analogous to the situation in the fcc structure. One is of the Shockley type with the Burgers vector (a/3)<112>. The other is of the Frank type with the Burgers vector (a/3)<111>. The movements of both types of partial can lead to the {111} stacking faults and the {111} twins observed in these films.     

Stair-rod dislocations in perovskite films on LaAlO3 substrates

Two types of stair-rod dislocation formed at junctions of {111} stacking faults in SrTiO₃-SrRuO₃ two-layer films on LaAlO₃ substrates have been studied by high-resolution transmission electron microscopy. The first type, formed by the interaction of two stacking faults situated at the flat SrRuO₃-LaAlO₃ interface without any step, has a Burgers vector (a/3)<110>. The other type, formed by the interaction of two stacking faults, of which one starts from the SrRuO₃-LaAlO₃interface area involving an interface step, has a Burgers vector (a/3)<120>. The formation mechanism of the stair-rod dislocations and the effect of the step are discussed.     

Buying Life Experiences for the “Right” Reasons: A Validation of the Motivations for Experiential Buying Scale

Although numerous studies have demonstrated the hedonic benefits of spending money on life experiences instead of material possessions, there has been no attempt to determine how different motivations for experiential consumption relate to psychological need satisfaction and well-being. Across five studies (N = 931), guided by self-determination theory, we developed a reliable and valid measure of motivation for experiential consumption—the Motivation for Experiential Buying Scale—to test these relations. Those who spend money on life experience for autonomous reasons (e.g., “because they are an integral part of my life”) report more autonomy, competence, relatedness, flourishing, and vitality; however, those who spend money on life experiences for controlled (e.g., “for the recognition I’ll get from others”) or amotivated reasons (e.g., “I don’t really know”) reported less autonomy, competence, and relatedness. These results demonstrated that the benefits of experiential consumption depend on why one buys life experiences.     

Mixture Factor Analysis for Approximating a Nonnormally Distributed Continuous Latent Factor With Continuous and Dichotomous Observed Variables

Mixture factor analysis is examined as a means of flexibly estimating nonnormally distributed continuous latent factors in the presence of both continuous and dichotomous observed variables. A simulation study compares mixture factor analysis with normal maximum likelihood (ML) latent factor modeling. Different results emerge for continuous versus dichotomous outcomes. For dichotomous outcomes, normal ML path estimates have bias that worsens as latent factor skew/kurtosis increases and does not diminish as sample size increases, whereas the mixture factor analysis model produces nearly unbiased estimators as sample sizes increase (500 and greater) and offers near nominal coverage probability. For continuous outcome variables, both methods produce factor loading estimates with minimal bias regardless of latent factor skew, but the mixture factor analysis is more efficient. The method is demonstrated using data motivated by a study on youth with cystic fibrosis examining predictors of treatment adherence. In summary, mixture factor analysis provides improvements over normal ML estimation in the presence of skewed/kurtotic latent factors, but due to variability in the estimator relating the latent factor to dichotomous outcomes and computational issues, the improvements were only fully realized, in this study, at larger sample sizes (500 and greater).