有效学习的三个易控变量:间隔、顺序与提取练习

近年来认知科学领域关于学习问题的研究颇为关注重新探索如何在教育实践中帮助学生找到可操控性强的有效学习策略,真正实现有效学习。三项经典研究的进展体现了这一研究趋势:一是学习时间间隔的动态分配,相比较于传统的学习时段分配,适当扩大各学习时段的时间间隔可使学习结果的保持更为长期有效(学习间隔时间控制在测试间隔时间的5%-10%左右是最佳的);二是不同学习事件的交错式安排,相对于批量式安排,学习事件的交错式安排可极大提升学习效果。三是提取练习对知识识记的作用,研究发现提取练习相比较于其它学习事件(编码)可更为有效地促进学习。尤为值得注意的是,三方面有关研究均发现,学习者所觉知的许多学习策略很可能是次优的甚至是低效的,对其加以纠正将有助于实现有效学习。     

Make New Friends but Keep the Old: The Sisterhood Bonds that Have Shaped Me

The relationships in an Asian American psychologist's life have helped to shape her as a person as well as a professional. Specifically, a review of significant female relationships indicates that they have contributed to the author's therapeutic style. In this article, the author explores some of the relationships with other women in her life and illustrates how they have informed her role as a therapist. She concludes with a case vignette illustrating how some of these concepts were applied to a long-term therapy client.     

Identifying the character of intrinsic stacking faults in the A15 compound Nb3Al

The character of intrinsic stacking faults on {001} in the A15 intermetallic compound Nb₃Al has been investigated using energy-dispersive X-ray spectroscopy in a field-emission-gun transmission electron microscope. Line scans were obtained across edge-on faults with an electron beam of approximate diameter 0.5 nm and it was found that the Al concentration is enhanced at the fault. Taken in conjunction with crystallographic data obtained previously, this implies that a {004} layer composed of Nb atoms only is removed to form these intrinsic stacking faults in Nb₃Al. The configuration of these faults implies that they may form by Nb vacancy coalescence and could act as embryonic nuclei for the precipitation of the D8_bcompound Nb₂Al.     

Prospective memory training in young adults enhances trained-task but not transfer-task performance

ABSTRACT

Training and transfer effects of prospective memory training have not been assessed in healthy young adults yet. The present study examined the effects of an 8-day prospective memory training programme using the Virtual Week computer game in 18–24-year-old students. Using the performance of an active control group as comparison, the study revealed a significant short-lived beneficial training-induced effect on a nearest-transfer task consisting of a different version of the trained task. No evidence was obtained for transfer effects to other tasks measuring prospective memory (near transfer), or to tasks measuring various executive functions or general intelligence (far transfer). These results were compared to those from a previous study in which an identical training and testing protocol was used in 13–15-year-old adolescents. This study did reveal some evidence of near and far transfer. The results of the two studies combined suggest a greater potential for prospective memory training to induce beneficial transfer effects in young adolescents than in young adults.     

Are personality disorders associated with social welfare burden in the United States?

This study examined the association between personality disorders and use of major social welfare services in a nationally representative sample of U.S. adults (N = 43,093). Social welfare services received and diagnoses of personality, substance use, mood, and anxiety disorders were assessed with the Alcohol Use Disorder and Associated Disabilities Interview Schedule-DSM-IV-version. Analyses quantified the association between personality disorders and forms of public assistance while controlling for numerous confounds. Logistic regression analyses revealed dependent personality disorder, paranoid personality disorder, antisocial personality disorder, and avoidant personality disorder were significantly associated with increased odds of receiving public assistance. In contrast, persons diagnosed with histrionic, schizoid, and obsessive-personality disorder were not significantly more likely to receive any public welfare service. Development of effective prevention and treatment of personality disorders would likely lead to reductions in overall social welfare burden.     

产前超声检查的医学伦理学思考

产前超声检查是指在妊娠期间应用超声检查技术检测母体内胎儿是否存在先天性缺陷和遗传性疾病,随着超声技术的迅速普及和发展,产前超声检查已成为产前诊断的不可缺少的有效手段之一。本文从医学与哲学的角度对产前超声检查的必要性、安全性、局限性以及相关医学伦理问题,如知情同意权、隐私权及人工流产等进行综合分析。     

Parental, Behavioral, and Psychological Factors Associated with Cigarette Smoking among Secondary School Students in Nanjing, China

We designed this study to assess parental, behavioral, and psychological factors associated with tobacco use among Chinese adolescents. The data were collected from 995 middle school students in Nanjing, China. Both smoking experimentation and current smoking (smoking in the past 30 days) were assessed among the study sample. Psychosocial measures include family structure, problem behaviors, social influence of smoking (both parental and friends’ approval of smoking), depressive symptoms, social alienation, self-esteem, parental monitoring (social monitoring and academic monitoring) and parenting style (responsiveness and demandingness). Among the study sample (mean age 15.16 years and 50% females), 24% ever smoked and 15% smoked in the past 30 days. Advanced age, male gender, low family SES, low school performance and low educational aspiration were associated with both smoking experimentation and current smoking. Depressive symptoms, social alienation, low self-esteem, low social and academic monitoring, problem behaviors, low maternal and paternal responsiveness, peer smoking, parent smoking, and parental and friends’ approval of smoking were positively associated with current smoking among Chinese adolescents. Future tobacco use prevention efforts among Chinese adolescents need to consider the parental, behavioral, and psychological correlates identified in the current study.     

Gender differences in the effects of post-learning emotion on consolidation of item memory and source memory

Item memory and source memory are two integral elements of episodic memory. Although many studies have examined the effect of emotion on item memory, little research has simultaneously taken into account item memory and source memory. In addition, in the majority of previous studies, learning stimuli are used as the source of emotion, making it difficult to understand whether emotion has an effect on encoding or on consolidation of episodic memory. Furthermore, although gender differences exist in neurophysiological responses to emotional stimuli, in many studies gender differences were neglected and this leaves the picture incomplete regarding the effect of emotion on episodic memory. In this study, we examined gender differences in the effects of post-learning emotion on consolidation of item memory and source memory. Participants learned neutral Chinese nouns, took a memory pretest, and were then randomly assigned to three conditions, in which they either watched a 3-min negative video clip, or watched a 3-min positive video clip, or remained calm and relaxed for 3 min. Thirty minutes after the initial learning, participants took a memory posttest. We found that: (1) For females, post-learning negative emotion enhanced consolidation of item memory; however, neither negative emotion nor positive emotion had a significant effect on consolidation of source memory; (2) For males, neither negative nor positive emotion after learning had a significant effect on either item memory or source memory. Possible reasons for the gender differences, as well as the theoretical significance and practical implications of this study were discussed.     

歧视知觉与农村贫困大学生孤独感:核心自我评价、朋友支持的中介作用

采用问卷测量769名贫困大学生和1014名非贫困大学生的歧视知觉、核心自我评价、朋友支持和孤独感,探讨歧视知觉对贫困/非贫困大学生的影响以及核心自我评价和朋友支持的中介作用。结果表明：（1）贫困大学生歧视知觉和孤独感显著高于非贫困大学生、核心自我评价和朋友支持显著低于非贫困大学生。（2）歧视知觉与贫困/非贫困大学生核心自我评价、朋友支持和孤独感相关显著,歧视知觉显著预测贫困/非贫困大学生孤独感。（3）贫困/非贫困大学生结构模型没有显著差异,核心自我评价和朋友支持部分中介歧视知觉对贫困/非贫困大学生孤独感的影响。     

双特征空间客体捆绑关系的存储机制——来自ERP的证据

利用事件相关电位技术(ERPs),采用延迟匹配任务的实验范式,测查了16名正常被试完成位置客体、方向客体和位置—方向捆绑客体的工作记忆诱发的皮层慢电位。实验发现:在第1个客体呈现后的300ms到600ms之间,在顶叶皮层(CP5、P7、P3),位置客体、方向客体比捆绑客体诱发了一个更负的成分; 在右额(F4、FC6、FC2、F8)、右后颞(TP10)、左颞(T7)、左后颞(TP9)等脑区,捆绑客体比单一特征客体诱发出了一个更正的成分; 在800至1400ms的慢波成分上,位置和方向捆绑客体在F4、FC6和F8三个记录点诱发的波形比单一特征客体的波形波幅更正。右侧前额叶参与了客体整合表征的存储,该结果支持了情景缓冲器的假设。