Categorization and representation of physics problems by experts and novices

The representation of physics problems in relation to the organization of physics knowledge is investigated in experts and novices. Four experiments examine (a) the existence of problem categories as a basis for representation; (b) differences in the categories used by experts and novices; (c) differences in the knowledge associated with the categories; and (d) features in the problems that contribute to problem categorization and representation. Results from sorting tasks and protocols reveal that experts and novices begin their problem representations with specifiably different problem categories, and completion of the representations depends on the knowledge associated with the categories. For, the experts initially abstract physics principles to approach and solve a problem representation, whereas novices base their representation and approaches on the problem's literal features.     

Age differences in memory span

Five-year-olds recalled fewer items than adults in memory-span tasks involving both familiar and unfamiliar faces. This occurred even though the use of rehearsal and recoding strategies was minimized for adults. This residual age difference may be partially accounted for by two further processing limitations in children. The five-year-olds needed more time than adults to name a face (Experiment 1) and to encode a face (Experiment 2). In order to test whether limitations in children's initial recognition and stimulus-identification processes could account for recall performance, Experiment 3 reduced adults' exposure duration in the memory-span task. This led to a drastic reduction in the age difference. Other factors contributing to remaining age differences included adults' adaptability in using various alternative encoding and retrieval strategies which elevated their recall performance.     

The Effects of Tai Chi Chuan Relaxation and Exercise on Stress Responses and Well-Being: An Overview of Research

The rationale of this article is to review, analyze, and discuss studies concerning the role of Tai Chi in stress management and well-being, linking those studies to research on exercise, yoga, and relaxation with regard to physiological and psychological wellness. All studies reported in PsychLit and Medline between 1996 and 1999 directly related to the subject, plus other studies relevant for the analysis, are addressed in this review. Studies reviewed in this article characterize Tai Chi as a form of moderate exercise. Although Tai Chi may not be suitable for achieving aerobic fitness, it may enhance flexibility and overall psychological well-being. Cognitively, there are indications that Tai Chi exercise may lead to improvements in mood. However, it is not clear whether the positive effects of Tai Chi are due solely to its relaxation and meditation component, or whether they are the consequence of various peripheral factors, since it is known that stress reduction often occurs when we indulge in activities we find pleasurable and satisfying. An important finding is that all studies on the benefits of Tai Chi for senior adults have revealed positive results.     

周敦颐的《太极图说》、《易》象数及西方有关学说

本文从《易》象数的角度来解释周敦颐的《太极图说》与《通书》,认为这种象数的“二对生”的区别性特征是周氏学说的内在发动结构,由此而提出一些很不同于流行的“宇宙论加上伦理学”的解释模式的思路。在一些被长久争论的问题上,比如“太极与无极的关系”、“太极与两仪的关系”、“诚与太极的关系”、“中与太极和诚的关系”,都提出了新的看法。在这新的理解方式中,周敦颐的《太极图说》就不止是程朱陆王的一个含糊的先导,而是融合了儒道释的思想精华,而又有着自己独特的思想原发力与中和的精微境界的划时代的哲理学说,其蕴义(比如超出理气二分的原本发生论)并未被后来的理学家们穷尽。本文最后将周敦颐的思想与西方的毕达哥拉斯及莱布尼兹的学说进行对比,一方面揭示“象数”在伟大的哲理传统中的关键作用,另一方面又表明中西两大传统之间存在的深刻差异在结构上的原因。     

Moderate Aerobic Exercise, T'ai Chi, and Social Problem-Solving Ability in Relation to Psychological Stress

This study evaluated the importance of exercise mode, social problem-solving ability, gender, and age in relation to anxiety and perceived daily hassles. Adult participants were classified as moderate aerobic exercisers, T'ai Chi exercisers, or sedentary via completion of a questionnaire. Social problem-solving ability, state and trait anxiety, and frequency and severity of daily hassles were measured. As predicted, scores indicating effective social problem-solving ability were associated with fewer reported severe daily hassles and with lower scores on state and trait anxiety. For state and trait anxiety, a main effect of exercise mode emerged after age and gender were controlled. A 3-way interaction involving age, gender, and exercise mode suggested that age and gender moderate the effects of exercise on anxiety, that is, the stress-reducing efficacy of different exercise modes may be dependent on a person's age and/or gender. Implications for theory, research, and practice are discussed.     

The beneficial effect of Tai Chi on self‐concept in adolescents

Previous research has documented the beneficial effect of Tai Chi, but most of the studies focused on elders and patients with specific health conditions. The aim of the study was to test whether Tai Chi can help to improve self‐concept in adolescents with a longitudinal study. The sample comprised 160 students from a Chinese middle school; half of students formed the experimental group and the rest formed the control group. A 1‐year Tai Chi intervention was delivered in 60‐minute sessions, five times a week. Both groups were instructed to complete the measure of self‐concept at the beginning and end of the intervention. Statistical analysis shows the significant reduction of good behaviour, intellectual and school status, popularity and anxiety in the experimental group compared with the control group. The results suggest that the Tai Chi intervention could improve self‐concept in adolescents.     

Thomas J. Sweeney: A Visionary Leader and Advocate for the Counseling Profession

The contributions of Thomas J. Sweeney to the counseling profession through professional leadership and advocacy, scholarship, teaching, and the development of Chi Sigma Iota are chronicled through a personal interview and comments from professional colleagues. Readers are provided with a sense of the depth and breadth of his more than 50 years of dedicated service.