Neuromuscular control in individuals with chronic ankle instability: A comparison of unexpected and expected ankle inversion perturbations during a single leg drop-landing

While neuromuscular control deficits during inversion perturbations in chronic ankle instability (CAI) cohorts are well documented in the literature, anticipatory motor control strategies to inversion perturbations in CAI are largely unknown. The purpose of this study was to examine neuromuscular control and ankle kinematics in individuals with CAI (n = 15) and matched controls (n = 15) during unexpected and expected single leg drop-landings onto a tilted surface rotated 20° in the frontal plane. Muscle activity from 200 ms pre- to post-landing was recorded from the tibialis anterior (TA), medial gastrocnemius (MG), peroneus longus (PL) and peroneus brevis (PB). Mean muscle activity, co-contraction index (CCI), and peroneal latency was analyzed. Ankle inversion angle at initial contact, time to maximum inversion angle, maximum inversion angle and velocity were also assessed. Significantly longer PL latency, less time to maximum inversion and greater maximum inversion angle was found in CAI compared to controls. Regarding landing condition, significantly greater maximum inversion angle, less inversion at initial contact, longer PB latency, less TA activity and frontal plane CCI during the post-landing phase was found during the unexpected perturbation. Prolonged PL latency and altered ankle kinematics suggests reduced frontal plane ankle stabilization in CAI. However, similar motor control strategies were utilized in both groups during the ankle inversion perturbations.     

自尊稳定性的认知神经机制

自尊稳定性(自尊在短期内波动的幅度)是一种具有重要心理功能的人格特质, 它既不同于自尊水平, 也区别于情境性自尊, 但在理论和测量上却与后两者具有密不可分的联系。然而, 由于目前人们对于自尊稳定性的认知神经机制知之甚少, 所以并不清楚它与自尊水平在生理机制上的关系是什么, 更不了解它会如何调节情境性自尊。鉴于此, 本研究计划将自尊稳定性、自尊水平和情境性自尊置于整合的认知神经加工模型(神经内分泌-脑-行为)之中, 通过融合心理测量、脑成像与应激诱发等多种技术指标, 力争全方位、多角度揭示自尊稳定性的认知神经机制, 及其与自尊水平、情境性自尊间的区别和联系。     

2～11岁儿童自我控制发展的稳定性与变化及其性别差异

采用实验室行为观察法考察了114名2～11岁儿童自我控制的发展变化及其性别差异。结果表明:(1)儿童的自我控制在2岁到4岁之间具有低等程度的相对稳定性,在4～11岁之间具有低等程度的相对稳定性。(2)女孩在2岁、4岁、7岁和11岁时的自我控制均显著高于男孩。(3)从2岁到11岁,男孩和女孩自我控制的发展变化存在差异。对于女孩来说,4岁时的自我控制显著高于2岁时,4岁与7岁、11岁之间以及7岁与11岁之间的自我控制均无显著差异;对于男孩来说,4岁时的自我控制显著高于2岁时,7岁时显著低于4岁,7岁与11岁之间的自我控制无显著差异。     

自尊水平与自尊稳定性的关系:完美主义的中介作用

采用中介性调节分析方法,探讨了青少年外显自尊、内隐自尊、完美主义和自尊稳定性的关系.研究发现:外显自尊通过在乎缺点这一中介变量影响着自尊稳定性,外显自尊与自尊稳定性之间的关系不存在追求高标准的中介作用;内隐自尊调节着外显自尊和在乎缺点、自尊稳定性的关系,在低外显自尊者中,内隐自尊低者倾向于在乎自己的错误,表现出较高的自尊不稳定性;外显自尊通过在乎缺点影响自尊稳定性的间接效应在低内隐自尊者中更为明显.进一步的研究应考虑内隐自尊稳定性在自尊研究中的作用.     

Work-family conflict and psychological well-being: Stability and cross-lagged relations within one- and six-year follow-ups

The rank-order stability and cross-lagged relations between work-to-family conflict (WFC), family-to-work conflict (FWC), and psychological well-being were examined in two longitudinal studies with full two-wave panel designs. In Study 1 (n = 365), the time lag was one year, and in Study 2 (n = 153), six years. The Structural Equation Modeling showed that the stability for WFC was .69 over one and .73 over six years. The respective stabilities for FWC were .57 and .48. Cross-lagged relations were not detected between WFC/FWC and low psychological well-being (job exhaustion, marital adjustment, parental stress, and psychological distress), expected to exist on the basis of the integrative model of work-family interface [Frone, M. R., Yardley, J. K., & Markel, K. S. (1997). Developing and testing an integrative model of the work-family interface. Journal of Vocational Behavior, 50, 145-167.]. Instead, high job exhaustion preceded high psychological distress, both within one- and six-year time lags, and within a one-year time lag: low marital adjustment preceded high psychological distress, and high psychological distress preceded high parental stress. These findings supported the spillover perspective on work-family interface [Edwards, J. R., & Rothbard, N. P. (2000). Mechanisms linking work and family: Clarifying the relationship between work and family constructs. Academy of Management Review, 25, 178-199.].     

认知诊断评价中测验结构的优化设计

Q矩阵是认知诊断评价的基础和核心要素, 它反映了测验的构念和内容设计, 直接影响着测验诊断分类的效果。本文采用Monte Carlo模拟, 研究了6种属性层级关系下, 不同的Q矩阵设计对于认知诊断效果的影响。用模式判准率的均值和标准差分别从分类准确性和稳定性的角度来评价诊断效果。实验结果表明：(1) 不同属性层级关系下, 分类准确性会随着测验长度的增加而提高, 但当测验长度增加到一定程度时, 会出现“天花板效应”; (2) Q矩阵中R*的个数(NR*)会影响测验的分类准确性及稳定性：NR*越大, 测验的分类稳定性越高, 当测验长度为属性个数的整数倍, 且NR*为测验长度相对属性个数的最大奇数倍时分类准确性最高; (3) Q矩阵中除R*以外的项目考察的属性个数会随着属性层级关系的不同对测验的分类准确性和稳定性产生不同的影响。根据实验结果, 本研究提出了进行诊断评价时Q矩阵优化设计的一些建议。     

稳定性与可变性：西方儿童青少年“大五”人格发展研究概述

弄清儿童青少年人格发展特点,可为人格发展与教育工作提供参考。文章梳理了近30年西方儿童青少年“大五”人格发展的研究进展,区分了人格发展的两种主要表现形式,并分别从这两方面总结出儿童青少年“大五”人格结构的稳定性、人格特质平均水平的可变性。最后基于现有研究存在的问题,结合当前时代特点,提出未来研究方向。     

当代民众信仰状况及其相关因素的心理学研究

为研究当代民众的信仰状况及其相关因素,采用自行设计的调查问卷对745名天津市民进行测量。结果显示:不同类别人群在信仰追求上存在非常显著的差异。物质信仰、伦理信仰与年龄有显著的正相关,精神信仰基本上不存在年龄差异。精神信仰和国家社会信仰与文化程度存在非常显著的正相关,而物质信仰、伦理信仰和宗教信仰均与文化程度存在非常显著的负相关。精神信仰和国家社会信仰与社会安定意识呈正相关,物质信仰和宗教信仰与社会安定意识呈负相关。     

The Stability of Child Problem Behaviors: A Longitudinal Analysis of Inner-City African American Children

We focused on the stability of child problem behaviors in a sample of 124 low-income inner-city African American families. Internalizing and externalizing problems were assessed longitudinally across four years. Test-retest correlation coefficients indicated that the relative stability of both internalizing and externalizing problems over the four-year assessment was high for both child and mother reported variables. Partial support was obtained for absolute stability of child problem behavior as analyses of variance revealed that two of four variables of interest did not change significantly over time. Mother report of child problem behavior was more stable than child report, but gender of child or type of problem behavior (internalizing vs. externalizing) was not related to stability. Hierarchical multiple regression analyses revealed that the historical context of child problem behaviors is important to consider, as earlier problem behaviors accounted for unique variance in later problem behaviors, beyond that accounted for the most recent assessment.     

Personality Changes in the Old–Old: A Longitudinal Study

Although many studies have examined the issue of personality stability in early and middle adulthood, few have explored the limits of personality stability in the very old, who are often confronted with major changes in their health and life circumstances which can severely impact adaptive behavior. We conducted a longitudinal study of 74 elderly women with a mean age of 80. They were assessed on the personality traits of Neuroticism, Extroversion, and Openness. Although multiple regression analyses revealed moderate stability on all 3 traits, their stability was found to be influenced by negative changes in life circumstances. For example, decreased social support and increased unmet needs were associated with more Neuroticism. Less Extroversion was associated with poorer health and greater psychosocial needs. The trait of Openness was very stable and was the least affected by life events. These contradictory findings are reconciled by considering personality development within an interaction framework.