Revisiting the mediating role of leader–member exchange in transformational leadership: the differential impact model

Transformational leadership (TFL) has been proposed as an essential antecedent of leader–member exchange (LMX), which in turn affects outcomes in organizations. We extend this mediation hypothesis in two ways by proposing a differential impact model, which we test on three organizational outcomes: employee job satisfaction, employee organizational commitment, and leader effectiveness. First, we extend LMX’s mediational impact—which has previously only been tested for employee outcomes—to leader effectiveness. Second, we argue that this mediation will be stronger for outcomes that are more proximal rather than distal to dyadic relations between leader and followers (high proximity: job satisfaction; medium proximity: organizational commitment; low proximity: leader effectiveness). Meta-analytic structural equation modelling based on 132 studies revealed that LMX mediates TFL’s relationships with employee outcomes (more strongly for job satisfaction than for commitment), but not with leader effectiveness, whereas TFL showed a stronger direct link to leader effectiveness. The findings suggest that TLF and LMX contribute differentially to organizational outcomes depending on their proximity to dyadic relations between leaders and followers. The differential impact model uncovers leadership effectiveness processes, integrates influential leadership theories, and highlights the importance of distinguishing between different outcome measures and the processes facilitating them.     

An improved spatial span test of visuospatial memory

In the widely used Corsi Block Test and Wechsler Spatial Span Tests, participants must reproduce sequences of blocks in the order touched by the examiner until two trials are missed at the same sequence length. The examiner records either the maximum number of blocks correctly reported or the total number of correct lists. Here, we describe a computerized spatial span test (C-SST) that uses psychophysical procedures to quantify visuospatial mean span (MnS) with sub-digit precision. Results from 187 participants ranging in age from 18 to 82 years showed that accuracy declined gradually with list length around the MnS (by ～30% per item). Simulation studies revealed high variance and biases in CBT and Wechsler measures, and demonstrated that the C-SST provided the most accurate estimate of true span (i.e., the sequence length producing 50% correct). MnS declined more rapidly with age than mean digit span (MnDS) measured in the same participants. Response times correlated with both MnS and MnDS scores. Error analysis showed that omission and transposition errors predominated, with weaker primacy and recency effects in spatial span than digit span testing. The C-SST improves the precision of spatial span testing and reveals significant differences between visuospatial and verbal working memory.     

失眠的自助式认知行为治疗元分析:疗效、影响因素及证据评价

通过元分析评估自助式失眠认知行为治疗的疗效,考察疗效影响因素,并评价证据质量。元分析共纳入35篇文献,研究发现:(1)自助式失眠认知行为治疗在治疗结束时对睡眠效率、入睡潜伏期、入睡后醒来时长、睡眠总时间、睡眠质量、抑郁和焦虑的效果量分别为0.66、-0.52、-0.47、0.20、0.34、-0.32和-0.33。(2)自助式失眠认知行为治疗与面对面失眠认知行为治疗疗效同等;自助式失眠认知行为治疗疗效显著优于最小化治疗和药物治疗。(3)共病情况与支持形式对疗效有显著影响。证据质量评价表明睡眠效率、入睡后醒来时长、睡眠总时间、抑郁和焦虑5项指标的证据质量为中等,真实值可能接近于估计值;入睡潜伏期与睡眠质量为低,真实值与估计值可能存在着差异。     

中国大学生自尊变迁的横断历史研究:1993～2013

本研究对1993年至2013年间83项采用Rosenberg自尊量表测量中国大学生自尊的研究进行横断历史元分析,考察我国大学生(被试为48384人)的自尊水平在这20年间的变化趋势。结果表明:(1)近20年,我国大学生的自尊水平呈下降趋势,相比于1993年,在2013年我国大学生的自尊下降0.89个标准差;(2)男、女大学生的自尊均呈下降趋势,且自尊的变化趋势性别差异不显著;(3)我国大学生自尊的变迁不存在生源差异,城镇与乡村大学生的自尊均随年代呈下降趋势。     

自我效能感与网络健康信息搜寻关系的元分析

自我效能感与网络健康信息搜寻行为的关系如何,目前研究存在较大分歧。为明确二者关系,探究分歧原因,对检索后获得的44项研究(46个独立效应值)使用随机效应模型进行元分析。结果发现：自我效能感与网络健康信息搜寻行为存在中等显著正相关(r=0.27, 95%CI=[0.21, 0.33]);二者的相关强度受文化背景和被试健康状况的调节,但不受性别、自我效能感测量指标和网络健康信息搜寻行为测量指标的影响。结果初步澄清了健康信念模型、信息搜寻综合模型和风险感知态度框架的争论,表明个体自我效能感水平越高,其网络健康信息搜寻行为往往也会越频繁。研究启示政府和健康医疗从业者可以通过开展网络使用技能培训等干预方式提升公众自我效能感水平,间接促进公众的网络健康信息搜寻行为。     

大学生人际信任变迁的横断历史研究

在当代剧烈的社会变迁背景下, 人们的信任水平可能会发生改变。本文采用横断历史研究方法, 对采用Rotter “人际信任量表”调查大学生人际信任水平的53篇研究报告进行了元分析, 这些文献涉及24233名大学生, 调查的时间跨度为1998年至2009年。研究结果表明：(1)我国大学生人际信任水平在这11年间显著降低, 相比1998年, 2009年时大学生的人际信任水平下降了1.19个标准差; (2)无论男生还是女生, 人际信任水平在11年间均显著下降, 其变化趋势和人际信任水平本身均不存在性别差异; (3)农村生源大学生的人际信任下降趋势呈边缘显著, 而城市生源大学生的人际信任水平没有明显变化, 但人际信任得分本身不存在生源地差异。     

A meta-analysis of aggression in the presence of violent cues: Effects of gender differences and aversive provocation

Meta-analytically examines experimental studies that include violent cues in the setting and assesses the effects of aversive provocation on gender differences in aggression. The results show that when violent cues are present, men are more aggressive than women under neutral unprovoked conditions. However, when they are exposed to both violent cues and aversive provocation, men and women are equally aggressive. Differences in individual reactivity to violent cues as well as the type of aggressive response and the sex of the target also affected the magnitude of gender differences in the presence of violent cues. Aggr. Behav. 23:447–456, 1997. © 1997 Wiley-Liss, Inc.     

中国背景下自我效能感与心理健康的元分析

社会认知理论指出自我效能感对心理健康具有重要意义,但两者的关系在以往的研究中尚不一致。当前研究采用元分析技术分析自我效能感对心理健康影响的主效应,并重点考察各调节变量在两者关系中的调节效应。通过文献检索和筛查,最终符合元分析纳入标准的文献有117篇。结果表明,自我效能感与心理健康积极因素呈显著正相关,而与心理健康消极因素呈显著负相关。此外自我效能感与心理健康的关系受自我效能感层级、社会发展和性别的调节;而年龄阶段仅调节了自我效能感与心理健康积极因素的关系。以上结果说明,高自我效能感个体的心理健康水平更高,同时还要考虑年龄阶段、自我效能感层级、社会发展和性别在两者关系中的作用。