A note on computing Louis’ observed information matrix identity for IRT and cognitive diagnostic models

Using Louis’ formula, it is possible to obtain the observed information matrix and the corresponding large-sample standard error estimates after the expectation–maximization (EM) algorithm has converged. However, Louis’ formula is commonly de-emphasized due to its relatively complex integration representation, particularly when studying latent variable models. This paper provides a holistic overview that demonstrates how Louis’ formula can be applied efficiently to item response theory (IRT) models and other popular latent variable models, such as cognitive diagnostic models (CDMs). After presenting the algebraic components required for Louis’ formula, two real data analyses, with accompanying numerical illustrations, are presented. Next, a Monte Carlo simulation is presented to compare the computational efficiency of Louis’ formula with previously existing methods. Results from these presentations suggest that Louis’ formula should be adopted as a standard method when computing the observed information matrix for IRT models and CDMs fitted with the EM algorithm due to its computational efficiency and flexibility.     

The effects of exposure to political and domestic violence on preschool children and their mothers

The purpose of this study was to examine the effects of exposure to political violence on preschool children and their mothers. We explored whether these dyads are different from dyads with no known history of exposure to violence and from mother–child dyads with known exposure to domestic violence. Specifically, we explored differences in mothers' psychological status (depression and anxiety), dyadic emotional availability (EA), children's social information processing, and children's social behaviour, in a sample of 216 dyads divided into three groups (exposure to political violence, no exposure to violence, and exposure to domestic violence). We found evidence to support our hypotheses that children exposed to domestic violence exhibit the highest levels of social maladjustment with smaller but still significant differences between children exposed to political violence and children in the comparison group. As expected, the lowest EA scores were found in the exposure to domestic violence group, followed by dyads in the exposure to political violence group. Dyads belonging to the comparison group (no exposure) exhibited the highest levels of EA. These findings contribute to our understanding of the meaning of exposure to political violence, as well as sharpen the difference between exposure to political and domestic violence.     

Things fall apart. The cultural complex in contemporary times1

These extraordinary months due to COVID-19 and the Black Lives Matter protests, set as they are against a backdrop of the increasingly worrying climate emergency, have brought fear, anxiety and discord across the globe. But we have also experienced a deepening of our understanding of our connectedness, protests against injustice, expressions of social concern and a demand for change. The concept of the cultural complex as developed by Singer & Kimbles (2004) offers a helpful means of connecting the psychology of the individual psyche and the political phenomena of power relations. Using a small example to illustrate how it might operate at a local level, I suggest that a fundamental shift is taking place raising profound levels of anxiety as we move from the known to the unknown. The bipolar nature of these complexes means the extremes are surfacing bringing fears of the very real possibility of more entrenched attacks on democracy from the far right and the hunkering down behind armed borders. But there is also hope that different ways of living together may be developing from the ground up, ways that are rooted in our sense of interdependence – with each other and our planetary home.     

Linguistic Distributional Knowledge and Sensorimotor Grounding both Contribute to Semantic Category Production

The human conceptual system comprises simulated information of sensorimotor experience and linguistic distributional information of how words are used in language. Moreover, the linguistic shortcut hypothesis predicts that people will use computationally cheaper linguistic distributional information where it is sufficient to inform a task response. In a pre-registered category production study, we asked participants to verbally name members of concrete and abstract categories and tested whether performance could be predicted by a novel measure of sensorimotor similarity (based on an 11-dimensional representation of sensorimotor strength) and linguistic proximity (based on word co-occurrence derived from a large corpus). As predicted, both measures predicted the order and frequency of category production but, critically, linguistic proximity had an effect above and beyond sensorimotor similarity. A follow-up study using typicality ratings as an additional predictor found that typicality was often the strongest predictor of category production variables, but it did not subsume sensorimotor and linguistic effects. Finally, we created a novel, fully grounded computational model of conceptual activation during category production, which best approximated typical human performance when conceptual activation was allowed to spread indirectly between concepts, and when candidate category members came from both sensorimotor and linguistic distributional representations. Critically, model performance was indistinguishable from typical human performance. Results support the linguistic shortcut hypothesis in semantic processing and provide strong evidence that both linguistic and grounded representations are inherent to the functioning of the conceptual system. All materials, data, and code are available at https://osf.io/vaq56/ .     

自我-朋友冲突情境下智慧推理的文化差异及其机制

相对于面对自己的人际冲突, 以独立自我为主的西方人在面对朋友的人际冲突时表现更智慧(所罗门悖论)。在以互依自我为主的中国人身上所罗门悖论是否会有不同特点?研究1通过在线平台招募中美两国被试, 随机分配到自我与朋友冲突组考察其智慧推理水平, 并考察自我类型的影响。对齐法与方差分析的结果均显示美国文化下朋友组智慧推理显著高于自我组, 而中国文化下两组差异不显著, 进一步分析发现中国文化下独立自我与冲突类型的交互项显著预测智慧推理。在此基础上, 研究2~4在中国文化背景下, 通过启动不同自我类型, 考察个体在自我或朋友冲突组中的智慧推理差异, 结果显示启动独立自我的朋友组显著高于自我组, 而启动互依自我的两组差异不显著。研究表明所罗门悖论可能只存在独立自我高的人身上, 并不具有普适性。可见心理学研究除了关注样本多样性问题外, 更需关注使用单一样本却默认结论具有文化普适性的研究者。     

What could be My Next Job? Using Flat Information Structures to Generate Creative Future Career Ideas

In a dynamic labor market, it is important to help people combine information and generate creative solutions to cope with complex career challenges. In the present research, we apply the theory of information structure to creative career idea generation and hypothesize that flat information structures—that is, structures in which the information is disorganized—are more conducive to creativity than hierarchical information structures—that is, structures in which information is organized in higher‐order categories. In two experimental studies, participants had to combine career information related to self and work preferences that was presented either in flat or hierarchical structures. We found that flat information structures, compared with hierarchical information structures, led to future career ideas that were more creative on average. Our results suggest that cognitive flexibility explains the effect of information structure on the creativity of career ideas. Theoretical implications and suggestions for career management practices are discussed.     

听觉线索与个体差异对音乐紧张感加工的影响

音乐无他, 张弛而已。音乐紧张感架起了客观音响与主观体验之间的桥梁, 是音乐情绪产生的前提和基础。音乐紧张感加工的影响因素主要来自客体与主体两方面。研究发现, 声学要素与调性结构是影响音乐紧张感诱发的声音线索, 而文化背景与音乐能力是影响听者对紧张感加工的个体因素。未来需要对时间结构与长时程调性结构诱发的紧张感及其机制进行深入探究, 这将有助于深化我们对音乐紧张感与情绪加工的认识。     

从个体到集体：心理学视角下的集体记忆

基于拓展思维的社会互动主义视角, 采用流行病学研究思路, 记忆的形成与维护构成了集体记忆心理学研究的核心问题。相关研究一方面以“对话”为研究语境, 系统阐释了集体记忆形成中的社会传染、检索诱发遗忘、共享现实和网络聚合等心理机制; 另一方面, 聚焦于既存的记忆, 阐释了集体记忆有效性的心理原则, 同时, 记忆的身份关联性得到了确证。集体记忆心理学研究仍需拓展视野, 加强对文化记忆的有效性研究, 密切关注媒介技术变革引发的记忆变化, 积极推进本土化研究。