Experimental Power for Indirect Effects in Group-randomized Studies with Group-level Mediators

Mediation analyses have provided a critical platform to assess the validity of theories of action across a wide range of disciplines. Despite widespread interest and development in these analyses, literature guiding the design of mediation studies has been largely unavailable. Like studies focused on the detection of a total or main effect, an important design consideration is the statistical power to detect indirect effects if they exist. Understanding the sensitivity to detect indirect effects is exceptionally important because it directly influences the scale of data collection and ultimately governs the types of evidence group-randomized studies can bring to bear on theories of action. However, unlike studies concerned with the detection of total effects, literature has not established power formulas for detecting multilevel indirect effects in group-randomized designs. In this study, we develop closed-form expressions to estimate the variance of and the power to detect indirect effects in group-randomized studies with a group-level mediator using two-level linear models (i.e., 2-2-1 mediation). The results suggest that when carefully planned, group-randomized designs may frequently be well positioned to detect mediation effects with typical sample sizes. The resulting power formulas are implemented in the R package PowerUpR and the PowerUp!-Mediator software (causalevaluation.org).     

Simple lines and shapes are associated with,and communicate,distinct emotions

We investigated whether lines and shapes that present face-like features would be associated with emotions. In Experiment 1, participants associated concave, convex, or straight lines with the words happy or sad. Participants found it easiest to associate the concave line with happy and the convex line with sad. In Experiment 2, participants rated (valence, pleasantness, liking, and tension) and categorised (valence and emotion words) two convex and concave lines that were paired with six distinct pairs of eyes. The presence of eyes affected participants’ valence ratings and response latencies; more congruent eye–mouth matches produced more consistent ratings and faster reaction times. In Experiment 3, we examined whether dots that resembled eyes would be associated with emotional words. Participants found it easier to match certain sets of dots with specific emotions. These results suggest that facial gestures that are associated with specific emotions can be captured using relatively simple shapes and lines.     

权力感对个体的影响:调节定向的视角

采用4个研究探究了权力感对调节定向的影响。研究1通过测量被试的特质性权力感和特质性调节定向初步探索权力感水平与调节定向的关系。研究2和研究3分别通过外显角色扮演和故事回忆法来探究状态性权力感对调节定向目标表征和策略选择的影响。研究4采用身体姿势法启动权力感,进一步探究在内隐层面权力感对调节定向的影响。结果发现,高权力感个体更倾向于促进定向;而低权力感个体更倾向于预防定向,并且排除了其中可能的无关变量(情绪)的影响。本研究有助于更好地理解和整合现有的权力感研究结果,并能预测更多未知的权力感效应。     

权力感对风险决策框架效应的影响

框架效应是指由于对事物描述方式的改变而引起决策者偏好反转的现象。以权力的接近-抑制理论以及模糊痕迹理论为基础,研究探索了权力感对风险决策框架效应的影响及其发生机制。实验一通过回忆法对170名学生被试进行权力操纵,综合运用四种类型的决策情境,研究考察了权力感与框架效应的关系。结果发现,高权力组被试的框架效应显著,低权力组被试者的框架效应不显著。实验二探讨权力感与框架效应的内在机制。结果发现,信息加工深度中介权力感与框架效应之间的关系     

Maintaining Men's Dominance: Negotiating Identity and Power When She Earns More

This article examines the power dynamics in marriages where wives earn substantially more than their husbands based on in-depth interviews with husbands and wives in 30 couples. The results demonstrate how normative gender expectations constrain interactions between spouses and how spouses in these unconventional marriages struggle to construct appropriate gender identities that are more or less consistent with the conventional expectations that men should be breadwinners and women should be homemakers. These data represent an important counterpoint to the growing body of quantitative work that demonstrates that a woman's power diminishes as her income exceeds her husband's by illuminating how men's power is preserved within marriage, even in the absence of their traditional economic dominance.     

预期想象对拖延的影响:想象过程和想象结果的效应分离

摘要 为了考察预期想象对不同拖延水平个体拖延行为的影响,本研究采用一般拖延量表(General Procrastination Scale)选取高拖延被试和低拖延被试,要求被试在进行模拟现实的拖延任务之前分别对任务过程和任务结果进行预期想象,比较不同拖延水平的被试在预期想象作用下拖延行为的变化。结果表明：(1)在两组被试中,相比于无想象条件下的拖延行为,对任务过程的预期想象增强拖延行为,对任务结果的预期想象削弱拖延行为;(2)对任务不同成分的预期想象所引发的情绪与拖延行为的变化相关显著。这说明情绪和预期想象是影响拖延的重要因素,合理地操纵对任务不同成分的预期想象可以有效干预拖延行为。     

公共物品困境中自我权力和他人权力对初中生合作行为的影响

本研究分别操纵被试稳定的权力（实验1）和不稳定的权力（实验2）,并与不同权力个体进行公共物品困境任务,以考察了自我权力和他人权力对初中生合作行为的交互作用及其权力稳定性在其中的作用。结果发现,在权力稳定情境下,高权力的初中生合作水平低于低权力组和控制组,而在权力不稳定的情境下,高权力的初中生合作水平高于低权力组。无论权力稳定与否,与低权力同伴合作时,低权力者的合作水平均显著高于与高权力同伴合作时。     

用不同外部表征方式集中呈现信息条件下的因果力判断

在分别用文字陈述、表格和图形三种外部表征方式集中呈现因果信息的条件下,用直接估计因果力大小的实验范式考察单一因果关系因果力估计的特点,检验概率对比模型,效力PC理论和pCI规则。让287名大学生被试估计不同化学药物影响动物基因变异的能力。结果发现,对单一因果关系因果力估计具有以下4个特点：⑴不对称性：在预防原因条件下的因果力估计较多符合效力PC理论,而在产生原因条件下的因果力估计一般符合概率对比模型;⑵文字陈述、表格和图形三种信息外部表征方式,不影响产生原因条件下的因果力估计,但影响预防原因条件下的因果力估计。在预防原因条件下,与文字陈述和表格表征相比,图形表征会促使更多被试按效力PC理论来做因果力估计;⑶没有被试使用pCI规则;⑷被试估计因果力所使用的规则存在明显的个体差异。     

权力操作范式的分析与比较

从认知的视角研究权力已是目前权力研究的主流,但权力的认知研究结果和外部效度均受制于其实验操作范式.对国外现有权力操作范式进行分析,可在促进其完善的同时,更对建构适合中国背景下的权力操作方式有一定的借鉴意义.从对现有主流权力操作范式,即奖惩法、回忆法、信息控制法、具体数值法、BATNA法、语义唤起等方法介绍,以及对其实证应用与检验结果中,可以明显对比出各种范式的优势与不足.现有学者较少意识到该点,使用各范式时不加区分,这引起了各范式在适用研究、多等级操作、相关概念操作等方面的混乱.未来研究仍需从角色分配、区分自我权力与他人权力操作、操作检验等角度,改进现有权力操作范式.     

中央线索化对听觉障碍人群辨别任务返回抑制的影响

选取一组先天聋被试和与之匹配的听力正常被试,采用线索提示范式考察中央线索化对听觉障碍被试在辨别任务中基于位置返回抑制的影响。实验结果发现,在有中央线索化的任务实验中,听力正常和听觉障碍被试都出现了返回抑制,但是听觉障碍被试消失得比听力正常被试早。无中央线索化的辨别任务实验中,听力正常被试组仅在SOA=650ms时,听觉障碍被试没有发现返回抑制现象。结果表明听觉障碍被试辨别任务的返回抑制更易受中央线索化条件的影响,听障被试的空间注意调节机制更具策略性和有效性。