Refining the two‐parameter testlet response model by introducing testlet discrimination parameters

For testlet response data, traditional item response theory (IRT) models are often not appropriate due to local dependence presented among items within a common testlet. Several testlet‐based IRT models have been developed to model examinees' responses. In this paper, a new two‐parameter normal ogive testlet response theory (2PNOTRT) model for dichotomous items is proposed by introducing testlet discrimination parameters. A Bayesian model parameter estimation approach via a data augmentation scheme is developed. Simulations are conducted to evaluate the performance of the proposed 2PNOTRT model. The results indicated that the estimation of item parameters is satisfactory overall from the viewpoint of convergence. Finally, the proposed 2PNOTRT model is applied to a set of real testlet data.     

信任是改善医患关系的关键

目前医患关系紧张,医疗纠纷频繁,同时又是新闻媒体追逐的热点,追究其原因是医患之间的不信任.如果医患之间成为相互信任的朋友,医患之间多一些相互理解,医生掌握精湛的医术,具备良好的沟通能力,做一个充满阳光的常常带给患者乐观情绪、鼓励话语、轻松气氛的医生,加上医疗体制的改革,应该可以有效改善紧张的医患关系.     

Is the contribution of the amygdala to the sex- and enhancement-related effects of emotional memory time-dependent?

A new focus in the field of emotional memory is the study of sex-related differences. Whether the sex-related lateralization of amygdala function (i.e., the female-left/male-right effect) in the emotional enhancement of memory (EEM) is time-dependent remains unclear. To evaluate this phenomenon, we conducted a two time-point study (20 min vs. 24 h) using fMRI and behavioral paradigms. We found that the right amygdala predicted 20-min EEM, while the left amygdala predicted 24-h EEM. The sex-related lateralization of amygdala function was not detected in either the 20-min or the 24-h EEM. Our results further confirm and extend the idea that the amygdala exhibits a lateralized and time-dependent dissociation, occurring even in the 24-h EEM relative to the 20-min EEM. The present and previous studies indicate that sex-related lateralization of amygdala function occurs in the 2- to 3-week EEM, but it does not occur in the 1-week, 24-h, or less than 30-min EEM, suggesting that this effect on emotional memory may also be time-dependent.     

Modelling partially cross‐classified multilevel data

This article proposes an approach to modelling partially cross‐classified multilevel data where some of the level‐1 observations are nested in one random factor and some are cross‐classified by two random factors. Comparisons between a proposed approach to two other commonly used approaches which treat the partially cross‐classified data as either fully nested or fully cross‐classified are completed with a simulation study. Results show that the proposed approach demonstrates desirable performance in terms of parameter estimates and statistical inferences. Both the fully nested model and the fully cross‐classified model suffer from biased estimates of some variance components and statistical inferences of some fixed effects. Results also indicate that the proposed model is robust against cluster size imbalance.     

本土化人格特征与知识分享行为的关系探讨——自我效能感和社会价值的中介作用

已有研究表明有效的知识分享有利于组织任务的完成,而人的因素是影响知识分享的核心和难点。该研究采用《中国人人格量表》第二版(简称CPAI-2),探讨中国背景下与文化相关的人格特质(人情、面子)如何影响个体知识分享行为(包括知识收集和知识贡献)。研究结果发现:(1)人情和面子可以显著预测知识分享行为,并通过自我效能和社会价值间接的影响知识分享行为;(2)上述中介作用在知识收集和知识贡献两个维度上表现为不一致的特点。研究结果说明,在中国文化的背景下促进知识分享行为,需要考虑人情、面子等传统人格特质;同时,促进组织成员的知识收集行为与知识贡献行为应该使用不同的策略。     

上海市青少年心理适应性研究

心理适应是心理健康的外在表现,更是现代社会中个体心理健康的重要标志.为了了解处于社会迅速转型时期的国际大都市上海地区青少年心理适应的状况,在全国调查的背景下,通过对上海地区小学五年级至高中三年级1515名青少年的调查和对仝国数据的比较发现:(1)上海市青少年的心理适应性总体水平略低于全国;(2)存在显著的年级差异,但与全国不同的是初二年级的心理适应性最差;(3)适应性在总体上不存在性别差异,但是女生在生理适应方面显著高于男生,而男生在人际适应方面显著高于女生;(4)学校性质、年龄、性别、家庭所在地、父母受教育水平、家庭月收入等因素与青少年心理适应性密切相关.     

论医学伦理学的自主性原则

医学伦理学的自主性原则是对个人的自主和自由的尊重,其核心是对人权的尊重,包含有知情同意、保密、隐私等具体规则.自主性原则是根源于西方强调个性自由和选择的自由主义道德传统,我国古代哲人也提出过相近乃至相同的看法.     

语义通达对语言标识效应产生的必要作用

大量研究表明语言标识对情绪体验具有调节作用，但并未深入分析这种调节效应产生的内在机制。本研究自下而上操纵标识词的形、音、义信息，探察不同效价情绪的标识效应产生对词汇形、音、义信息的依赖性。结果发现，与仅具有音、形信息的假词相比，真词作为标识词时可以显著降低被试对负性图片的消极体验。表明词汇语义信息的通达是标识效应产生的必要条件，仅具有词汇音和形的信息不足以产生标识效应。     

创伤后应激障碍的民族差异问题

创伤后应激障碍(PTSD)的民族差异主要体现在少数民族PTSD的发生率较高和症状反应与症状结构的差异。以美国代表的西方国家的研究表明, 这些差异主要是源于暴露水平、少数民族的社会地位以及不同的文化背景。汶川地震后, 有研究也发现羌族PTSD发生率高于汉族, 然而对于羌汉民族间症状反应的具体差异及其原因, 还并不十分明确。因此, 有必要在中国进行PTSD民族差异系统深入的研究, 这既有助于灾后心理援助工作更加有针对性的开展, 也能够为从东方文化视角下理解PTSD提供理论依据。     

自恋与决策的研究现状及展望

目前, 自恋与决策的研究主要依托实验室任务进行, 涉及赌博、投资和管理等领域的决策行为。大部分研究结果表明, 自恋者在上述实验任务中都表现出明显的决策偏差与风险决策, 但也有研究证实了某些情境下其决策的有效性。自恋与决策的理论模型主要包括人格特质模型、自我调节模型、归因模型与趋近回避模型等, 未来研究应注意方法的改进、自恋的积极功能、情绪的作用以及文化的影响。