Particle swarm optimised analysis of investment decision

A portfolio forecasting model based on particle swarm optimization (PSO) algorithm with automatic factor scaling is proposed in this Article to effectively improve the accuracy of related analysis model in portfolio application. Firstly, the portfolio problem is analyzed and a hybrid constraint portfolio model is obtained by improving portfolio model with consideration of general portfolio model and combination of market value constraint and upper bound constraint according to Markowitz's theory. Secondly, PSO algorithm is introduced during analysis on portfolio model and solution is found with the hybrid constraint portfolio model of PSO on portfolio. In addition, in order to further improve the performance of PSO in model solution, automatic factor scaling is used for adaptive learning on parameters associated with PSO, to improve convergence of the algorithm. At last, simulation experiments show that the algorithm proposed can obtain a more ideal investment portfolio scheme, thereby reducing investment risks and obtaining greater investment returns.     

Reducing tunnel vision with a pen‐and‐paper tool for the weighting of criminal evidence

In order to prevent tunnel vision, and ultimately miscarriages of justice, police, prosecutors, and judges must remain open to alternative scenarios in which the suspect is in fact innocent. However, it is not evident from the literature that people are sufficiently aware of how alternative scenarios should be employed in the decision‐making process. In the present research, participants read a case vignette and formed an impression of the suspect's guilt. Some participants were made familiar with an alternative scenario. Others were not only presented with an alternative scenario but were also instructed to score (with pen and paper) the extent to which every piece of evidence fitted in the primary and the alternative scenario. Findings suggest that this pen‐and‐paper task helped to reduce tunnel vision.     

情绪性记忆的定向遗忘效应

刺激的情绪性具有增强记忆的效果,那么,带有情绪信息的刺激对遗忘又会产生怎样的影响？已有研究从行为及认知神经机制层面探讨了情绪性刺激对定向遗忘效应的影响,但结果并不一致。总结已有文献发现,以情绪性刺激的材料类型、情绪效价、唤醒度和熟悉度为主的客观因素和以被试的情绪状态为主的主观因素均为影响定向遗忘效应产生及其稳定性的重要原因。这类研究是对有意遗忘研究领域的重要补充,也加深了人们对有意遗忘机制的理解。     

羞怯与受欺负:社交回避与被他人容纳的多重中介效应

采用大学生羞怯量表、被他人容纳量表、大学生社交回避及苦恼量表和欺负问卷测量了369名大学生,探讨社交回避和被他人容纳在羞怯与受欺负之间的作用。结果表明:(1)羞怯、社交回避和受欺负三个变量彼此之间均呈显著正相关,这三个变量与被他人容纳均呈显著负相关;(2)羞怯不仅直接影响受欺负,也通过社交回避-被他人容纳的链式中介作用间接影响受欺负。     

社会支持对大学生社会幸福感的影响—希望的中介作用

基于积极心理学,采用问卷调查法,对1098名大学生进行调查,探讨社会支持对社会幸福感的影响,并基于希望进行中介效应检验,借此构建三个变量之间的关系模型,探索促进大学生心理健康发展的内在机制。结果表明:社会支持、希望与社会幸福感之间两两相关显著; 社会支持和希望及其各维度,显著正向影响大学生的社会幸福感; 社会支持通过希望影响大学生社会幸福感水平。研究结果证实了希望在社会支持影响社会幸福感中起部分中介作用的心理机制,为大学生心理健康教育提供了参考建议。     

应急救援团队的个体与团队情境意识：社会网络关系的调节作用

采用地震后建筑物倒塌,被困人员转运的任务情景,以99名消防指挥系大四学员为被试,研究个体情境意识和团队情境意识的关系,以及社会网络关系中的网络密度和结构洞指标在其中的调节作用。结果表明：(1)个体情境意识与团队情境意识不相关,即团队情境意识不是个体情境意识的简单相加;(2)共享情境意识对团队情境意识有负向影响：个体情境意识之间的差异越大,团队情境意识就越高;(3)对于网络密度较大的团队,结构洞对共享情境意识和团队情境意识的关系起到正向调节的作用;(4)对于网络密度较小的团队,结构洞对共享情境意识和团队情境意识的关系起到负向调节的作用。     

Approach-avoidance,attentional and evaluation biases in hair pulling disorder and their relationship with symptom severity

The present study examined approach-avoidance, attentional and evaluation biases in Hair Pulling Disorder (HPD). Although none of the tasks showed indications of biased action tendencies in response to hair pulling-related pictures, or biased attention for hair pulling-related words, we found that patients were slower to react to hair pulling-related stimuli than to neutral stimuli. This slowing down may indicate that patients are ambivalent towards hair pulling. This “ambivalence” positively correlated with HPD symptom severity, but only on one of the three severity measures we assessed. Concerning action tendencies towards hair pulling-related words, patients were, however, faster to react to hair pulling-related words when compared to words related to resisting hair pulling. Future research is needed to disentangle this ambivalent response pattern in HPD.     

Perceptual experience shapes our ability to categorize faces by national origin: A new other-race effect

People are better at recognizing own-race than other-race faces. This other-race effect has been argued to be the result of perceptual expertise, whereby face-specific perceptual mechanisms are tuned through experience. We designed new tasks to determine whether other-race effects extend to categorizing faces by national origin. We began by selecting sets of face stimuli for these tasks that are typical in appearance for each of six nations (three Caucasian, three Asian) according to people from those nations (Study 1). Caucasian and Asian participants then categorized these faces by national origin (Study 2). Own-race faces were categorized more accurately than other-race faces. In contrast, Asian American participants, with more extensive other-race experience than the first Asian group, categorized other-race faces better than own-race faces, demonstrating a reversal of the other-race effect. Therefore, other-race effects extend to the ability to categorize faces by national origin, but only if participants have greater perceptual experience with own-race, than other-race faces. Study 3 ruled out non-perceptual accounts by showing that Caucasian and Asian faces were sorted more accurately by own-race than other-race participants, even in a sorting task without any explicit labelling required. Together, our results demonstrate a new other-race effect in sensitivity to national origin of faces that is linked to perceptual expertise.     

The perception of (naked only) bodies and faceless heads relies on holistic processing: Evidence from the inversion effect

Faces and bodies are more difficult to perceive when presented inverted than when presented upright (i.e., stimulus inversion effect), an effect that has been attributed to the disruption of holistic processing. The features that can trigger holistic processing in faces and bodies, however, still remain elusive. In this study, using a sequential matching task, we tested whether stimulus inversion affects various categories of visual stimuli: faces, faceless heads, faceless heads in body context, headless bodies naked, whole bodies naked, headless bodies clothed, and whole bodies clothed. Both accuracy and inversion efficiency score results show inversion effects for all categories but for clothed bodies (with and without heads). In addition, the magnitude of the inversion effect for face, naked body, and faceless heads was similar. Our findings demonstrate that the perception of faces, faceless heads, and naked bodies relies on holistic processing. Clothed bodies (with and without heads), on the other side, may trigger clothes-sensitive rather than body-sensitive perceptual mechanisms.