群组发展模型——干预研究的新方法

群组发展模型(group-based trajectory model,GBTM)是一种用于研究群体异质性的新方法,旨在识别群体内遵循不同发展轨迹的亚组,并描绘亚组成员特征。这一模型为干预研究提供了新的研究视角,群组发展模型不仅可以探讨干预是否引起分组比例变化,也关注干预对个体的发展轨迹的影响,并评估干预对不同轨迹组的效果差异。     

Aggressive behavior among girls and boys during middle childhood: predictors and sequelae of trajectory group membership

Using longitudinal data spanning early elementary through middle school, aggression behavior trajectory groups were identified for boys and girls. Early elementary school predictors of trajectory group membership were examined as well as whether trajectory group predicted physical aggression, covert delinquency, and substance use in 9th grade. Semiparametric group modeling identified aggression behavior trajectory groups. We identified four aggression trajectory groups for both genders described as “not involved,” “low,” “moderate,” and “high.” Attention problems, family conflict, and low school commitment and attachment were predictors of membership in higher aggression groups for both boys and girls. Low family involvement and low parental education predicted membership in higher aggression groups for boys; while depression, low‐income status, and having a single parent predicted higher aggression group membership for girls. For both boys and girls, few risk predictors distinguished between the moderate and high aggression trajectories except that low school commitment and having a teen mother were significant predictors of being in the high group for girls, and low parental education and income were significant predictors of being in the high group for boys. Membership in the higher aggression trajectory groups predicted involvement in violent behaviors, covert delinquency, and substance use in 9th grade. Findings suggest that children who display an early trajectory of high levels of aggressive behavior are more likely to continue involvement in later problem behaviors. Second‐grade predictors suggest commonality of risk across genders and provide evidence of modifiable targets for preventive interventions. Aggr. Behav. 32:1–15. 2006. © 2006 Wiley‐Liss, Inc.     

Life satisfaction trajectories among junior high school students in China: The role of parent–child communication

A 3-year follow-up test (from grades 7 to 9) was administered to 807 junior high school students from two regions in Hunan Province, China, using multilevel analysis to examine trends in junior high school students' life satisfaction, differences by gender and location of life and the effects of father–child/mother–child communication on the development of life satisfaction. The results showed that (1) Chinese junior high school students' life satisfaction showed a decreasing trend from the seventh grade to the ninth grade, and there was a significant decreasing process in the eighth grade; (2) father–child communication and mother–child communication had a significant positive predictive effect on Chinese junior high school students' life satisfaction and (3) father–child communication and mother–child communication had a significant negative predictive effect on the decreasing trend of life satisfaction, in which the effect of mother–child communication was particularly significant.     

中国大学生幸福评价的时间轨迹

幸福评价的时间轨迹是指人们对自己的过去、现在和将来的幸福评价的轨迹。从过去、现在和将来角度来研究幸福, 对于全面理解幸福本质具有重要的意义。本研究用两项研究探索了中国大学生的幸福评价的时间轨迹。研究1让130名大学生完成时间维度生活满意度量表, 结果发现, 中国大学生认为过去与现在的幸福没有显著区别, 将来比过去和现在都幸福, 即过去幸福=现在幸福 < 将来幸福, 这与西方的研究结果过去幸福 < 现在幸福 < 将来幸福的轨迹不同。研究2采用实验法, 让45名大学生对描述幸福和不幸福的形容词进行评定, 再次支持了中国大学生的这一幸福评价的时间轨迹。不幸福评价的时间轨迹呈现出过去不幸福=现在不幸福 > 将来不幸福的趋势。     

情绪调节效应的发展:一个V型发展趋势

从青少年早期到成人早期,个体情绪调节等高级社会认知功能得到进一步完善,对情绪调节的需求也日趋增长。情绪调节的发展是青少年情绪社会化发展一个重要的任务,学会采用有效的调节策略对自身情绪进行调节是青少年社会性发展的一个重要表现。在众多关于青少年社会行为研究中,对负性情绪调节能力的探究最为成熟与深入。以往研究指出,儿童青少年对负性情绪的体验激活和调控失败都是导致其非适应性行为的原因,情绪调节方式的错误选择会与其外化行为问题和和内化行为问题有很大的关联。由于青少年适应性行为的习得是多种社会性发展指标的重叠和交叉作用的体现,我们无法完全理清其中的复杂交互作用,因此从情绪调节策略的使用效应发展入手探讨个体的适应是寻求问题解决的一个可行手段。 以往研究者认为,成熟且有效的情绪调节指的是,个体能够通过控制自身的激活和唤醒以达到情绪性、生理性和社交的适应,最后达成个人的目标。情绪调节的发展也可被看作是从被动式的、有他人参与的调节（例如,社会性参照）逐渐进步为主动的、有意识的根据外部线索进行的情绪调节（例如,根据指导语提示调整自己情绪状态）。 本研究旨在探究不同年龄被试（青少年早期、青少年晚期、成人早期）在按照不同指导语提示要求下增强调节和减弱调节调节效应量的年龄差异。选取上海市初中生被试35名（22男,13女;M = 14.06岁,SD = 0.42 岁, 年龄范围：13-15岁）、高中生被试37名（13男,24女;M=16.56岁, SD=0.56岁, 年龄范围：16-18岁）以及成人被试35名（9男,26女;M = 23.60岁,SD = 1.96岁, 年龄范围：20-29岁）,采用3（年龄：初中生、高中生、成人,被试间变量）? 3（情绪刺激：正性、中性、负性,被试内变量）? 3（调节策略：增强调节、减弱调节、不调节,被试内变量）混合实验设计,使用情绪反应性—调节图片任务（Reactivity and Regulation-Image Task,REAR-I Task）对不同年龄被试情绪调节策略使用的效应量进行考察（Carthy, Horesh, Apter, Edge, & Gross, 2010）。 研究发现,从总体趋势来说,情绪调节策略的效应发展呈V型发展趋势。当不同年龄被试按照指导语要求对其情绪体验进行主动调节时,成人被试的调节效应是最大的,初中生次之,而高中生的调节效应则最低。情绪调节的V型发展趋势与以往研究中关于情绪调节态度以及自我发展的趋势相一致。另外,与增强调节策略的使用相比,减弱调节策略效应的发展是最大的。这可能与中国背景下减弱调节的适应价值有关。     

Effect of Heel Heights on Female Postural Control During Standing on a Dynamic Support Surface With Sinusoidal Oscillations

The authors aimed to investigate female balance or stability control with comparative analysis of the center of pressure trajectory and plantar pressure distribution with different high-heeled shoes while standing on a dynamic surface with multidirectional perturbations. College females with at least 2 years' history of wearing high-heel shoes voluntarily participated in the test with a Novel Pedar insole (Novel, GmBH, Munich, Germany. With heels height increasing, the pressure time integral obviously transfer to the medial forefoot region, with center of pressure trajectory medially deviated significantly, either under anteroposterior or mediolateral perturbations. The passive plantarflexion position of ankle incurred by high heel increased the range of motion in the frontal plane but decreased ankle stability, thus increasing the challenge of body balance maintenance.     

(Re)evaluating the Implications of the Autoregressive Latent Trajectory Model Through Likelihood Ratio Tests of Its Initial Conditions

The autoregressive latent trajectory (ALT) model synthesizes the autoregressive model and the latent growth curve model. The ALT model is flexible enough to produce a variety of discrepant model-implied change trajectories. While some researchers consider this a virtue, others have cautioned that this may confound interpretations of the model's parameters. In this article, we show that some—but not all—of these interpretational difficulties may be clarified mathematically and tested explicitly via likelihood ratio tests (LRTs) imposed on the initial conditions of the model. We show analytically the nested relations among three variants of the ALT model and the constraints needed to establish equivalences. A Monte Carlo simulation study indicated that LRTs, particularly when used in combination with information criterion measures, can allow researchers to test targeted hypotheses about the functional forms of the change process under study. We further demonstrate when and how such tests may justifiably be used to facilitate our understanding of the underlying process of change using a subsample (N = 3,995) of longitudinal family income data from the National Longitudinal Survey of Youth.     

PTSD symptom trajectories: from early to chronic response

This study aimed to identify posttraumatic stress disorder (PTSD) symptom trajectories across the first 12 months following traumatic injury. Three hundred and seven consecutively admitted injury survivors were assessed for severity of PTSD symptoms just prior to discharge, and at 3 and 12 months postinjury. Growth modeling was used to determine the curve that best fit the trajectory for each symptom cluster over the 12-month period. Individuals with 12-month PTSD showed significantly higher re-experiencing, arousal, and avoidance symptoms at eight days posttrauma relative to those without, and these symptoms escalated over time. Those without PTSD maintained their relatively low symptom levels. These findings highlight that individuals who will go onto develop PTSD have a distinctly different symptom course than those who recover.