Task feedback effects on conflict monitoring and executive control: relationship to subclinical measures of depression

Emerging evidence suggests that depression is associated with executive dysfunction, particularly after committing errors or receiving negative performance feedback. To test this hypothesis, 57 participants performed two executive tasks known to elicit errors (the Simon and Stroop Tasks) during positive or negative performance feedback. Participants with elevated depressive symptoms (Beck Depression Inventory scores >or= 13) were characterized by impaired posterror and postconflict performance adjustments, especially during emotionally negative task-related feedback. Additionally, for both tasks, depressive symptoms were inversely related to postconflict reaction time adjustments following negative, but not positive, feedback. These findings suggest that subclinical depression is associated with impairments in behavioral adjustments after internal (perceived failure) and external feedback about deficient task performance.     

The worried mind: autonomic and prefrontal activation during worrying

To study the psychophysiological correlates of worrying, the authors recorded heart rate, respiratory sinus arrhythmia (RSA), skin conductance level, and alpha electroencephalographic asymmetry in healthy males during baseline, relaxation, worry induction, and anticipation of an impromptu speech task. Compared with baseline, relaxation, and anticipation, worrying was associated with greater heart rate and lower RSA. Worrying was further characterized by higher skin conductance levels compared with baseline but lower levels than during anticipation. Finally, worrying was associated with relatively greater left frontal activity compared with anticipation. Trait public speaking anxiety was positively correlated with left frontal activity during worrying. These results support the notion that worrying is a unique emotional state that is different from fearful anticipation.     

Dislocation motion in silicon: the shuffle-glide controversy revisited

Considering recently computed formation and migration energies of kinks on nondissociated dislocations, we have compared the relative mobilities of glide partial and shuffle perfect dislocations in silicon. We found that the latter should be more mobile over all the available stress range, invalidating the model of a stress driven transition between shuffle and glide dislocations. We discuss several hypotheses that may explain the experimental observations.     

First principles determination of the Peierls stress of the shuffle screw dislocation in silicon

The Peierls stress of the a/2?110? screw dislocation belonging to the shuffle set is calculated for silicon using density functional theory. We have checked the effect of boundary conditions by using two models, the supercell method where one considers a periodic array of dislocations, and the cluster method where a single dislocation is embedded in a small cluster. The Peierls stress is underestimated with the supercell and overestimated with the cluster. These contributions have been calculated and the Peierls stress is determined in the range between 2.4?×?10^?2 and 2.8?×?10^?2?eV?Å^?3. When moving, the dislocation follows the {111} plane going through a low energy metastable configuration and never follows the 100 plane, which includes a higher energy metastable core configuration.     

解读曼殊五部曲

苏曼殊是清末民初萃集革命与刨作于一身的“奇人异僧”。从革命的角度说,他意志坚定,积极投身于孙中山领导的资产阶级民主革命,为推翻清朝统治和袁世凯帝制尽心竭力;从创作的角度说,他多才多艺,以风格独特的诗歌、小说、散、翻译、绘画树帜坛,赢得生前和身后无数读的击节和赞赏;从身份的角度说,他是个亦僧亦俗、亦侠亦儒的革命和艺家。他曾获得的桂冠大体停留在不大反映本质的“诗僧”、“情僧”、“风流和尚”、“革命和尚”等一类称号上,然而随着这位传奇的历史人物的“真面目”越来越清晰呈现于世,而不再继续充当人们揣测的对象。     

注重检验专业学生在微生物检验实习中临床沟通能力的培养

临床检验专业已成为独立的学科,微生物检验对临床抗感染合理用药具有指导意义.微生物检验实习生需通过完善知识结构,强化专业技术实践,加强临床合作,积极参与病例讨论,加强师生之间沟通,以及沟通技巧的学习,促进临床沟通能力的培养.