Simultaneous and alternate combinations of action-observation and motor imagery involve a common lower-level sensorimotor process

Combining the motor simulation techniques of action observation and motor imagery (AOMI) is known to enhance motor performance more than when these techniques are presented in isolation. The present study examined the involvement of lower-level sensorimotor processes for the improvement in a dart-throwing task using AOMI. Novice participants (n = 70) were assessed on their dart-throwing both before and after a six-week AOMI training intervention that was contingent upon the random allocation of groups. Participants were randomly allocated into groups involving AOMI, where they observed either a congruent action, incongruent action or fixation cross (control), while simultaneously or alternately imagining the dart-throwing task. Dart-throwing performance was significantly more improved for the simultaneous- and alternate-congruent groups compared to the simultaneous-fixation and control groups. There was no indication of improvement by any of the other groups. This improvement appeared to coincide with lower EMG activity at the agonist and antagonist muscles, which would indicate greater movement efficiency. The findings suggest that AOMI involves a common lower-level sensorimotor process, which can lead to motor facilitation or interference, dependent upon whether the simulation techniques are congruent or incongruent with each other, respectively. What's more, this feature does not appear to differ as a function of the structure of delivery (i.e., simultaneous vs. alternate).     

Is doing your homework associated with becoming more conscientious?

Research has shown that sustained homework effort enhances academic performance and that students’ conscientiousness is a powerful predictor of students’ homework effort. But does homework—as homework proponents claim—in turn also influence the development of conscientiousness over time? In the present study, we examined whether students’ homework effort in two subjects (i.e., mathematics and German) was associated with inter-individual differences in students’ development of conscientiousness in the early years of adolescence. Bivariate change models with a total of N = 2760 students revealed that homework effort and conscientiousness were systematically related over time (Grade 5 to Grade 8). Most importantly, students who invested more effort in their homework showed more positive development in conscientiousness.     

Dimensionality of the Beck Anxiety Inventory in a Polytrauma Sample of OEF/OIF/OND Veterans: Findings From Exploratory and Confirmatory Factor Analysis

The Beck Anxiety Inventory (BAI) is commonly used as a screening instrument for symptoms of anxiety in clinical settings. The factor structure has been researched in a variety of different clinical settings with results ranging from a 2- to 5-factor structure. The purpose of this study was to explore the factor structure of this instrument in a polytrauma veteran sample. A sample of 304 veterans was used for this study. All subjects were administered the BAI screening measure as part of an evaluation in an outpatient polytrauma clinic. Exploratory factor analysis was conducted for half of the sample, followed by confirmatory factor analysis for the remaining sample to determine the best model. Factor analyses revealed that a 5-factor model provided a best fit. It is interesting to note that previously identified models of the BAI with other types of samples did not provide the best fit for this polytrauma sample. The BAI may provide additional information for clinicians when examining the 5-factor model with veterans in polytrauma settings. The factor structure of the BAI includes 1 factor (i.e., personal safety) that may be unique for veterans who have served in combat zones.     

“大五”人格模型及其在工业与组织心理学中的应用

“大五”是涵盖人格的5个因素的简称,它包括：神经质、外向性、开放性、宜人性和责任感。在介绍了该模型的基础上,文章重点介绍了它在工业与组织心理学中的应用,即“大五”可以有效的预测工作绩效、工作动机、领导行为、创造性行为和工作满意感等。     

性别在企业员工成人依恋对工作绩效关系中的调节作用

本研究探讨了依恋关系对员工工作绩效影响,并进一步考察了性别在两者关系中的调节作用。通过采用亲密关系经历量表(ECR)、关系问卷(RQ)和工作绩效问卷三个研究工具,对110名不同职业和岗位员工的依恋模式与工作绩效的关系进行调查,结果发现：1. 倾注型被试在情境绩效上的得分显著得低于安全型被试和害怕型被试。2.依恋焦虑与任务绩效和情境绩效均呈显著正相关。3.依恋焦虑可以正向预测情境绩效。4. 通过进一步分析,发现男性和女性在情境绩效和任务绩效上有所不同,说明性别在依恋关系和工作绩效之间起调节作用。     

Influence of chronic stretching on muscle performance: Systematic review

The aim of the current study was to investigate the influence of chronic stretching on muscle performance (MP) by a systematic review. The search strategy included MEDLINE, PEDro, Cochrane CENTRAL, LILACS, and manual search from inception to June 2016. Randomized and controlled clinical trials, non-randomized, and single group studies that have analyzed the influence of flexibility training (FT) (using any stretching technique) on MP were included. Differently, studies with special populations (children, elderly, and people with any dysfunction/disease), and articles that have used FT protocols shorter than three weeks or 12 sessions were excluded. The MP assessment could have been performed by functional tests (e.g. jump, sprint, stretch-shortening cycle tasks), isometric contractions, and/or isotonic contractions. Twenty-eight studies were included out of 513. Seven studies evaluated MP by stretch-shortening cycle tasks, Ten studies evaluated MP by isometric contractions, and 13 studies assessed MP by isotonic contractions. We were unable to perform a meta-analysis due to the high heterogeneity among the included studies. In an individual study level analysis, we identified that 14 studies found positive effects of chronic stretching on MP. The improvements were observed only in functional tests and isotonic contractions, isometric contractions were not affected by FT. Therefore, FT might have an influence on dynamic MP. However, more studies are necessary to confirm whether FT can positively affect MP.     

结果冲突与作业难度对双重作业绩效的影响

运用单作业和双作业操作探讨结果冲突与作业难度对双重作业绩效的影响。结果表明：（１）信息干扰对双作业操作有着明显的影响。信息干扰越大,结果冲突效应越大,双作业操作绩效越差。（２）作业难度对双作业绩效有明显影响。作业难度越大,双作业操作绩效越差。根据实验结果,本研究提出了双因素假设：信息干扰和资源竞争是影响双作业操作绩效的两个主要因素。     

不同认知作业年老化特点的比较研究

本工作应用自行设计的软件程序和微机人机对话方式,完成六项认知作业的年老化特点的比较研究,被试506人,46—75岁。研究结果表明:1)“心算”和“符号数字”两项作业完成速度随年老迅速减慢,但测验成绩随年老缓慢降低,速度变化是该两项作业年老化过程的主要特点;2)“数字鉴别”和“计数”两项作业完成速度随年老减慢较缓;3)“双位数字顺序回忆”和“无意义图形再认”两项作业测验成绩随年老下降迅速,但前者更为明显;4)速度和成绩两项指标的个体差异均随年老有增大趋向。