污染效应在消费者行为领域的表现及其心理机制

随着健康问题越来越受到消费者的重视, 学者们对污染效应的研究和兴趣也与日俱增, 特别是在消费者的感知和偏好方面。在消费者行为研究中, 污染效应是指消费者会降低对他人接触过产品的感知价值。本研究主要回顾了在消费行为中污染效应的定义和特性, 然后从接触因素、位置因素、产品因素和社会因素等方面来探讨污染效应的前因, 并进一步归纳了污染效应对消费者行为的消极影响和积极影响。最后, 探讨了污染效应的理论基础和边界条件。在此基础上, 对污染效应在消费者行为领域的未来研究方向进行了展望。     

A Class of Distribution-Free Models for Longitudinal Mediation Analysis

Mediation analysis constitutes an important part of treatment study to identify the mechanisms by which an intervention achieves its effect. Structural equation model (SEM) is a popular framework for modeling such causal relationship. However, current methods impose various restrictions on the study designs and data distributions, limiting the utility of the information they provide in real study applications. In particular, in longitudinal studies missing data is commonly addressed under the assumption of missing at random (MAR), where current methods are unable to handle such missing data if parametric assumptions are violated. In this paper, we propose a new, robust approach to address the limitations of current SEM within the context of longitudinal mediation analysis by utilizing a class of functional response models (FRM). Being distribution-free, the FRM-based approach does not impose any parametric assumption on data distributions. In addition, by extending the inverse probability weighted (IPW) estimates to the current context, the FRM-based SEM provides valid inference for longitudinal mediation analysis under the two most popular missing data mechanisms; missing completely at random (MCAR) and missing at random (MAR). We illustrate the approach with both real and simulated data.     

A new modulated structure in GaN nanoparticles

A new modulated structure with a superlattice having parameters a = 2.209nm, b = 3.826nm, c = 1.037nm and f = g = n = 90 has been found in GaN nanoparticles synthesized by a dc arc plasma method. The nanoparticles transformed further into particles with holes at their centres under electron-beam irradiation during high-resolution electron microscopy observations. At the same time, Ga atoms were extruded on to the surface of the nanoparticles and formed an amorphous layer. A series of simulations of high-resolution images and electron diffraction patterns revealed that the modulation could be attributed to aggregations of N vacancies founded during the electron bombardment. Molecular mechanics calculations show that the aggregation of N vacancies is far more energetically favourable than that of Ga vacancies. The stability of the GaN particles is discussed.     

Roughening kinetics of reactively sputter-deposited Ti-Al-N films on Si(100)

The roughening kinetics of Ti_{1? x} Al _x N (0?x? 1) films 600 nm thick synthesized by reactive dc magnetron sputtering on Si(100) substrates has been investigated by atomic force microscopy (AFM). The quantification of surface roughening was achieved by calculation of both vertical root-mean-square roughness and lateral correlation lengths of the film surface using the height-height correction functions of measured AFM images. For all the Ti_{1? x} Al _x N films, a steady roughness exponent α = 0.94 ± 0.03 was determined. The evolution of the surface topography as a function of Al concentration is discussed in terms of the competition between surface diffusion and shadowing instability during sputter deposition.     

临床思维与决策能力是医学教育的重要组成部分

临床思维与决策能力培养是医学生不可或缺的一门必修课程,临床医生实际上每天处于临床决策之中,必须为疾病提供诊断和治疗的决策.而当前临床医学生在此方面训练甚少,临床工作具有很大的不可预知性和不可确定性,尤其是在手术室繁忙、变化的环境中,进行高效的临床决策就显得尤其重要.本文阐述了临床思维与临床决策在医学教育中的重要地位及其相互关系,分析当前医学生临床实践中的思维与决策方面存在的问题.并从临床实际角度出发,探讨如何提高医学生临床思维与决策能力的方法,对促进医学教育模式改革,提高医学教育质量具有重要推动作用.     

Cross-cultural generalizability of the Personality and Role Identity Structural Model (PRISM): Implications for trait and cultural psychology

The cross-cultural generalizability of the Personality and Role Identity Structural Model (PRISM; Wood & Roberts, 2006) was tested in the United States, Mexico, Malaysia, China, and Japan. Participants rated their general and role identities, as defined by the PRISM, using Big Five trait adjectives, then rated their personality states (i.e., role experiences) in various roles in multiple daily interactions for 14 days. Structural predictions based on the PRISM were supported in all five cultures. Cultural differences were limited and did not reflect cultural differences in individualism–collectivism, dialecticism, or cultural tightness. The results supported the cross-cultural generalizability of the PRISM and the merits of contextualized trait measures in the prediction of role experiences. Implications for trait and cultural psychology are discussed.     

Modeling Concordance Correlation Coefficient for Longitudinal Study Data

Measures of agreement are used in a wide range of behavioral, biomedical, psychosocial, and health-care related research to assess reliability of diagnostic test, psychometric properties of instrument, fidelity of psychosocial intervention, and accuracy of proxy outcome. The concordance correlation coefficient (CCC) is a popular measure of agreement for continuous outcomes. In modern-day applications, data are often clustered, making inference difficult to perform using existing methods. In addition, as longitudinal study designs become increasingly popular, missing data have become a serious issue, and the lack of methods to systematically address this problem has hampered the progress of research in the aforementioned fields. In this paper, we develop a novel approach to tackle the complexities involved in addressing missing data and other related issues for performing CCC analysis within a longitudinal data setting. The approach is illustrated with both real and simulated data.     

Saccades elicit obligatory allocation of visual working memory

In daily life, visual working memory (VWM) typically works in contexts in which people make frequent saccades. Here, we investigated whether people can effectively control the allocation of VWM when making a saccade. Subjects were required to make an intervening saccade in the process of a memory task. The saccade target was either a to-be-remembered item or an extra, not-to-be-remembered item. The results showed that memory performance was poorer when a saccade was made to the extra, not-to-be-remembered item, regardless of its similarity to the memory item(s). In contrast, when memorizing the items while remaining fixated, subjects had similar memory performance whether an extra, not-to-be-remembered item was present or not. Taken together, these results demonstrated that volitional control over VWM allocation is greatly impaired when a saccade is made, indicating that VWM contains an automatic part that cooperates with eye movements and is allocated to a saccade target obligatorily.     

任务转换中的反应-反应相容性效应

采用任务转换范式,分别以阿拉伯数字奇偶判断和组成汉字词的汉字结构一致性判断为任务,通过两个实验探查了不同类型材料在任务转换中的反应—反应相容性效应。结果发现:(1)材料类型对反应—反应相容性效应有影响,任务转换前阿拉伯数字材料存在反应—反应相容性效应,汉字词材料不存在反应—反应相容性效应;(2)任务转换时段对阿拉伯数字奇偶判断任务的反应—反应相容性效应没有影响,转换前后阿拉伯数字奇偶判断任务都存在反应—反应相容性效应;(3)任务转换时段对汉字词任务的反应—反应相容性有影响。转换前没有反应—反应相容性效应,转换后存在反应—反应相容性效应。     

Chronic social comparison elicits depression- and anxiety-like behaviors and alterations in brain-derived neurotrophic factor expression in male rats

Animal Cognition - Social comparison is a fundamental human characteristic; however, long-term social comparison may induce psychological stress and can lead to depression and anxiety. Recent...