不同心理一致感初中生对压力的态度激活研究

该研究采用不同加工任务的间接测量方法,探讨不同心理一致感水平初中生对压力的外显认知倾向和内隐态度激活程度。结果表明:1)初中生较为稳定的积极认识和反应倾向在他们关于压力的外显认知加工中起了更为显著的作用;2)不同加工方式的虚惊率差异表明存在着初中生对压力情境的内隐态度,且这种无意识认知较为消极。     

A new orthorhombic approximant of the icosahedral Al–Cu–Fe quasicrystal

We report on the formation of a new crystalline approximant phase of the icosahedral (i-)Al–Cu–Fe quasicrystal. This phase is formed during sintering of Al-based composites reinforced with i-AlCuFeB quasicrystalline particles. The structure of this phase has been characterized by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM). TEM revealed that it is a B-centred orthorhombic phase with lattice parameters a = 1.166 nm, b = 1.195 nm and c = 3.44 nm. Its chemical composition, as determined by electron energy loss spectroscopy (EELS), is close to Al_76.9Cu_2.7Fe_20.4, with an average number of valence electrons per atom e/a of 1.92, similar to the value in all other approximants of the i-phase discovered thus far. Initial results on local atomic arrangements along one of its pseudo-5-fold axes are also presented.     

Effect of lithium-ion irradiation on the crystallization kinetics of glassy Se98In2

Differential scanning calorimetry (DSC) has been used to study the crystallization kinetics of glassy Se₉₈In₂ both before and after irradiation of the alloy with high-energy (50 MeV) lithium ions. After the ion-irradiation, significant changes in the kinetic parameters of crystallization of the glass were observed. The results are explained in terms of a model involving irradiation-induced defects.     

The prediction of turnover intention by means of employee engagement and demographic variables in a telecommunications organisation

This study sought to determine the prediction of turnover intention by employee engagement and demographic variables in a large South African information and communication technology (ICT) organisation. Cross-sectional survey data was collected from the organisation. Using a sample of 2276 participants the Utrecht Work Engagement Scale (UWES) was employed to measure employee engagement, while the Intention to Stay Questionnaire (ISQ) measured turnover intentions. Employee engagement was significantly negatively related with turnover intentions. A factor analysis conducted on the UWES indicated that activation accounted for 10% of the variance in turnover intentions. Age and tenure had statistically significant negative relationships with turnover intentions, whilst qualification and race had significant positive relationships with turnover intentions. The results also confirmed the predictive model of employee engagement as well as the impact of the demographic variables of race, age, tenure on turnover intentions. The study has practical implications in relation to its ability to contribute to human resources activities in the form of differentiated remuneration and retention strategies based on differences in age and tenure.     

Muscle Damaging Exercise Affects Isometric Force Fluctuation as well as Intraindividual Variability of Cognitive Function

Healthy untrained men (N = 11) were asked to perform 10 series of 12 repetitions of knee eccentric extension (EE) at 160° per second. Quadriceps muscle torques evoked by electrical stimulation at 20 Hz (P20) and 100 Hz (P100), maximal voluntary isometric contraction torque (MVC), maximal isokinetic concentric torque (IT) at 30° per second, voluntary activation index (VA), simple reaction time (RTs), complex reaction time (RTc), and torque variability at 30% of MVC were measured before EE, immediately after EE, and 60 min and 24 hr after EE. MVC, IT, P20, P100, and VA decreased significantly after EE and remained depressed 24 hr later. Torque variability increased significantly after EE. Average RTs and RTc did not change after EE, whereas intraindividual variability in RTs and RTc increased significantly after EE.     

Response Facilitation and Inhibition in Manual,Vocal, and Oculomotor Performance: Evidence for a Modality-Unspecific Mechanism

In 2 experiments (N = 10, Experiment 1; N = 16, Experiment 2), the authors investigated whether evidence for response facilitation and subsequent inhibition elicited by masked prime stimuli can be observed for output modalities other than manual responding. Masked primes were followed by target stimuli that required a 2-choice manual, saccadic, or vocal response. Performance was measured for compatible trials in which primes and targets were identical and for incompatible trials in which they were mapped to opposite responses. When primes were presented centrally, performance benefits were obtained for incompatible trials; whereas for peripherally presented primes, performance benefits were found in compatible trials. That pattern of results was obtained for manual responses and for saccadic eye movements (Experiment 1), demonstrating that those effects are not mediated by specialized dorsal pathways involved in visuomanual control. An analogous pattern of effects was found when manual and vocal responses were compared (Experiment 2). Because vocal responding is controlled by the inferotemporal cortex, that result shows that prime-target compatibility effects are not primarily mediated by the dorsal stream, but appear to reflect modality-unspecific visuomotor links that allow rapid activation of motor responses that may later be subject to inhibition.     

Efficacy of guided self-help behavioural activation and physical activity for depression: a randomized controlled trial

Behavioural activation and physical activity have received empirical support that highlight their efficacy in reducing depression. Even though both behavioural activation and physical activity share the common goal of reactivating the individual, limited research has directly compared these interventions, and more research is required to evaluate their efficacy when offered in low-intensity formats. The present study involves a randomized controlled clinical trial comparing the efficacy of two guided self-help interventions for the treatment of depression: behavioural activation and physical activity. Fifty-nine participants presenting mild-to-moderate symptoms of depression were randomized either to a behavioural activation intervention (n = 20), a physical activity intervention (n = 19) or a wait-list control group (n = 20). All participants completed symptom measure pre-, mid- and post-intervention, as well as at a two-month follow-up. Mixed-model analyses of variance revealed that both interventions were significantly more efficacious in reducing depressive symptoms in comparison with the control group. Physical activity involved significantly less time-investment compared to the behavioural activation condition (less than half the amount of time). These results indicate that physical activity and behavioural activation both effectively reduce depressive symptoms and are favourably applicable in low-intensity formats. Implications of these results and avenues for future research are discussed.     

Development of a Behavioral Activation–Based Intervention for Cigarette-Smoking Young Adults

Quitting smoking during young adulthood can substantially reduce tobacco-related morbidity and mortality later in life. Depressive symptomatology is prevalent among smokers and increases risk for poor smoking cessation outcomes. However, few integrated behavioral interventions simultaneously target smoking and depressive symptoms and rarely have young smokers been included in the development of these interventions. In this paper we describe an 8-session behavioral activation–based treatment for smoking (BATS; MacPherson et al., 2010) adapted for youth. We conducted a series of focus groups with young adult smokers with depressive symptoms in order to modify treatment manuals to be developmentally appropriate. Subsequently, we completed a small pilot group (n = 5) of the intervention to provide preliminary data on feasibility, acceptability, and outcomes. We provide a case series of the participants in order to provide clinical illustrations of how the modified BATS treatment was implemented among young adults. Most pilot study participants exhibited smoking abstinence and smoking reductions at the end of treatment, as well as improvement in depressive symptoms and maintenance of levels of activation and environmental reward. Participants provided positive qualitative constructive feedback regarding the intervention.     

状态不确定独立否定句的加工机制

采用自定步速阅读方法与图片核证范式(picture verification paradigm)探讨状态不确定独立否定句(如“裙子不是红色的”)的动态表征过程, 包括3个实验。结果发现：(1)在否定加工的初期, 即250 ms间隔时间条件下, 读者表征事件的否定状态; 肯定句已经通达事件的实际状态。(2)在否定加工的中期, 即750 ms间隔时间条件下, 读者仍然表征事件的否定状态, 但已开始对事件的备择选项进行搜索; 肯定句仍然保持对事件实际状态的表征。(3)在否定加工的后期, 即1500 ms间隔时间条件下, 读者表征否定标记与事件的否定状态, 同时完成对备择选项的搜索; 肯定句依旧保持对事件实际状态的表征。据此, 本文提出的锚激活与限制满足模型(anchor-based activation and satisfaction constrained model)得到初步证明。     

一个中枢炎性免疫诱发长时程抑郁样行为的新模型

脂多糖(lipopolysaccharide, LPS)免疫激活模型是研究抑郁症细胞因子假说的重要动物模型, 目前国际上常用外周单次LPS注射诱发抑郁样行为, 但该模型中抑郁样行为持续仅有数小时。为建立诱发较长时程抑郁样行为的免疫激活动物模型, 本研究尝试侧脑室注射LPS激活大鼠中枢免疫炎性反应, 考察单次以及重复中枢LPS注射诱发抑郁样行为的效果, 以及中枢炎性免疫诱发行为改变的时程。结果显示：单次中枢LPS注射后24 h只能诱发旷场自发活动和探索行为下降等部分抑郁样行为, 未能诱导糖水偏好下降和悬尾不动时间增加; 3次重复注射则在末次LPS注射后24 h表现出显著的糖水偏好下降, 自发活动和探索行为减少, 悬尾不动时间增加等行为。且自发活动、探索行为减少和悬尾不动时间增加能够延续至末次LPS注射后72 h。这些结果表明脑室重复LPS注射可诱发较长时程的抑郁样行为, 这种新的中枢炎性免疫激活诱发的抑郁症模型, 为研究抑郁症炎性免疫机制提供了更为有效的动物模型, 有助于深入探讨行为和免疫功能间的复杂关系。