左侧背外侧前额叶在程序性运动学习中的作用

程序性运动学习包括序列学习和随机学习。神经影像学研究表明背外侧前额叶皮层(DLPFC)和初级运动皮层(M1)在程序性运动学习中发挥重要作用, 但DLPFC和M1之间的联通性及其与不同程序性运动学习的关系尚不明确。本研究采用连续反应时间任务, 结合经颅磁刺激(TMS)方法, 探讨左侧DLPFC到M1的联通性在不同程序性运动学习中的差异。实验1采用两连发TMS探测DLPFC到M1的最佳投射时间点; 实验2, 被试分为2组, 分别进行序列学习和随机学习, 在学习前、后采集行为学数据, 以及M1的运动诱发电位和DLPFC-M1联通性的电生理学数据。行为学结果发现序列学习组的学习效果更佳; 电生理学结果发现, 两组被试学习前、后M1的运动诱发电位均未发生改变; 在最佳时间投射点、适当刺激强度下, 序列学习组DLPFC-M1联通性发生改变, 且与学习成绩相关, 而随机学习组没有改变。结果说明DLPFC到M1的联通性增强可能是序列学习成绩更佳的重要原因, 这一结果从电生理角度为DLPFC在运动学习中的作用提供了重要证据。     

Supervisor Reactions to Avoidance Job Crafting: The Role of Political Skill and Approach Job Crafting

Avoidance job crafting refers to employees proactively changing work boundaries by reducing tasks and/or interactions with others. Although avoidance job crafting may help employees to address work demands, if noticed by others, specifically supervisors, it may trigger negative reactions from them. While previous research posits that job crafting is largely unnoticed by supervisors, using a dyadic supervisor-employee study (N = 141 dyads), we found that supervisors were in fact aware of their employees’ avoidance job crafting, which related to a reduction in supervisor support. This relationship was moderated by employee political skill (but not approach job crafting), such that high avoidance job crafting in combination with high political skill resulted in fewer negative outcomes, presumably because supervisors were less likely to notice their employees’ avoidance job crafting. In a second, vignette study (N = 92 supervisors), we experimentally replicated the relation between observed avoidance job crafting and negative supervisor reactions, and found that this relation can be explained by supervisors perceiving avoidance job crafting as destructive work behavior. Our findings introduce the supervisor perspective to the job crafting literature and highlight the importance of engaging in avoidance job crafting in a skillful way that aligns with the external context.     

生涯规划清晰度对大学生学习参与的影响:有调节的中介模型

考察生涯规划清晰度对大学生学习参与的影响机制。采用生涯规划量表、学习过程问卷、团队学习氛围量表和学习参与量表对728名大学生进行调查。结果发现:(1)生涯规划清晰度对学习参与具有显著正向影响;(2)学习动机在生涯规划清晰度与大学生学习参与间起部分中介作用;(3)同伴学习氛围在中介模型的后半段路径中起调节作用。这一结论有助于理解生涯规划清晰度对学习参与的作用机制,对提升大学生学习参与水平具有一定的启发意义。     

The effects of valence‐based and discrete emotional states on aesthetic response

There is increasing recognition that consumer aesthetics—the responses of consumers to the aesthetic or appearance aspects of products—has become an important area of marketing in recent years. Consumer aesthetic responses to a product are a source of pleasure for the consumer. Previous research into the aesthetic responses to products has often emphasized exterior factors and visual design, but studies have seldom considered the psychological aesthetic experience of consumers, and in particular their emotional state. This study attempts to bridge this gap by examining the link between consumers’ emotions and their aesthetic response to a product. Thus, the major goal of this study was to determine how valence‐based and discrete emotional states influence choice. In Studies 1 and 2, positive and negative emotions were manipulated to implement two different induction techniques and explore the effect of emotions on participants’ choices in two separate experiments. The results of both experiments confirmed the predictions, indicating that aesthetic responses and purchase intention are functions of emotional valence, such that both are stronger for people in a positive emotional state than for those in a negative emotional state. Study 2 also used a neutral affective state to establish the robustness of this observed effect of incidental affect. The results of Study 3 demonstrate that aesthetic response and purchase intention are not only a function of affect valence, but also are affected by the certainty appraisal associated with specific affective states. This research, therefore, contributes to the literature by offering empirical evidence that incidental affect is a determinant of aesthetic response.     

Elastic modelling of periodic composites with particle interactions

The mechanical properties of periodic composites containing identical spherical particles are investigated using the principles of micromechanics and homogenization procedures. The averaged strain and stress fields are derived in terms of an eight-particle interaction. The effective elasticity with the cubic symmetry tensor is explicitly obtained. If the interaction term is dropped, then one recovers the conventional Mori–Tanaka model. With further approximations, the dilute model and the self-consistent model can also be obtained within the proposed framework. It is observed that the particle interactions make no contribution to the effective bulk modulus, a result that is consistent with other models and experiments for composites with cubic lattices.     

PbO compensation in the growth of PbWO4: Y3+ crystals

The light yield of Y³⁺-doped PbWO₄ crystals increases after low-dose-rate irradiation with?γ?rays, and the radiation hardness is sensitive to annealing temperature. In the PWO growth procedure, an excess of PbO in the starting materials is a convenient method of compensating for PbO volatility. The relationship between the excess of PbO and the abnormal radiation behaviour has been investigated. The mechanism of the normal excess of PbO in the growth of PWO: Y³⁺ is discussed.     

关系类别及其学习机制

关系类别是指类别的成员身份由一个共同的关系结构决定。其意义来自于其与其他实体的关系或其内部的一系列成分间的关系,关系类别强调关系结构的系统性。文章重点介绍和评述了相似性种类,关系类别和实体类别的联系和差异,关系类别的学习过程及机制———结构—映射理论。未来的研究方向主要是探索新的研究范式,以深入理解关系类别的学习;深入探讨校准和映射过程与其他基本认知过程的相互作用,为关系类别的学习提供更一致的认知观点。     

Attracting Minority Applicants to Malaysian Organizations: The Effect of Race Composition

This study aims to investigate the effect of race composition of organizational representatives on perceived similarity, organizational attractiveness, and perceived opportunities for advancement. Two hundred and twenty four Malaysian Chinese university students participated in the study. The findings showed that race composition was significantly related to the participant’s perception of similarity to the representatives, attraction to the organization, and perception of advancement opportunities in the organization. Minority Chinese participants gave higher ratings on all three outcome variables when they were presented with an organization featuring a homogenous group of Chinese representatives or a racially diverse group of representatives, than an organization featuring a homogenous group of Malay representatives in recruitment advertising. In summary, the inclusion of minority representatives in recruitment advertising is beneficial in attracting minority applicants.     

末期癌症患者的临终关怀

临终关怀与末期癌症关系密切,末期癌症患者是临终关怀的主要对象,这也是姑息医学的主要内容.作为发展中的学科,本文对临终关怀的发展、目的、内容及其在末期癌症患者中的实施作一综述.