小学生视觉-空间表征类型和数学问题解决的研究

本研究考察并比较了四至六年级儿童的视觉－空间表征策略、数学问题解决和空间视觉化能力。结果表明：五、六年级儿童的解题正确率、使用图式表征策略的程度显著高于四年级儿童;使用图像表征策略的程度各年级无显著差异。将数学问题分成三个难度等级,发现年级差异主要表现在难度等级1的题目上。另外,六年级儿童的空间视觉化能力显著高于四年级儿童。     

学习不良儿童的心理行为问题

学习不良儿童的心理行为问题已成为人们关注的一个焦点。从心理健康的角度考察,学习不良儿童心理行为问题主要表现在生活和社会适应、学习和违纪,以及焦虑、抑郁和自杀等方面;造成上述现象的主要原因要有自我概念较低、家庭因素的不良影响,以及社会认知方面存在的缺陷。可以通过干预和矫正学习不良儿童的心理行为问题,从而提高他们的心理健康水平。     

问题解决中策略的变化：一项微观发生研究

以30名小学三年级儿童为被试,以一种特殊的方程问题为材料,采用微观发生法,先后进行了5次测查,收集了解题后的口语报告资料,从策略变化的路线、速率、广度、来源以及变化模式的多样性等方面详细探讨了问题解决策略的变化过程。结果发现,在面临新的问题时,被试缺乏相应知识和专门的解题策略,这时以使用多种常规策略以及错误策略为主;此后,当被试建构起对问题的正确表征时,就以使用正确策略为主,甚至发现了非常有技巧性和领域专门性的快捷策略,这时策略的数量明显减少;在面临难度较大的迁移题目时,快捷策略的使用率又降低,而更多借助于常规策略。可见,策略的获得是一个由错误到正确、由多种尝试到选择其一、由一般到专门的演化过程,这主要是一个学生自主建构的过程,当然也受到正式和非正式教育提供的知识的影响。值得说明的是,快捷策略的获得受到问题呈现模式的影响。总是呈现相同题目的单一模式有助于快捷策略的发现,而在混合训练中,插入不同性质的题目会干扰快捷策略的发现;但是,当面临迁移问题时,单一训练相比于混合训练的优势会消失。此外,正确使用常规策略是发现快捷策略的前提。     

儿童早期数学认知能力的结构及其特点

从北京市10所幼儿园中选取234名3、4岁的儿童为被试,采用个别测查的方法对儿童早期数学认知能力的结构及其特点进行了考察。经验证性因素分析发现：(1)儿童早期数学认知能力的结构模型是合理的,可接受的,具有较好的构想效度,具体讲,数、计算、测量、空间／几何和模式认知能力五个维度共同解释着儿童早期的数学认知能力;(2)不同年龄儿童早期数学认知能力的结构具有稳定性,但是结构模型并不完全一致,某些项目的解释率有所不同;(3)男、女儿童早期数学认知能力的结构模型具有一致性。     

Quantum Mechanics and "Song of Myself": Getting a Grip on Reality

Most recent writing linking science and literature has concerned itself with challenges to the epistemological status of scientific knowledge in an attempt to demonstrate its contingency, arguing in the more radical efforts that the structures of science are no more than useful fictions. This essay also includes an epistemological comparison between science and literature, but instead of making grand or meta–statements about the nature of knowing generally in the two fields, mine is a much narrower aim. My exploration entails two tasks. First, I provide a close–up look at a particular type of experiment, called the delayed–choice experiment, which clearly reveals the strangeness of the quantum world. In connection with this experiment, I discuss wave functions—mathematical expressions used by physicists to describe quantum behavior and predict the outcome of experiments involving quanta. Second, I look at Walt Whitman's “Song of Myself” focusing on the meaning of the “self” in the poem. My aim is to treat the object of study in each field as a “text” and to assert and demonstrate a parallel in the strategies of thought and response between physicists (“readers”) pondering the meaning and status of a wave function and poem readers pondering the meaning and status of the poem's self. In Whitman's “Song” we find an attempt to understand complex aspects of human experience that are said to transcend ordinary reality, an effort for which I believe there are parallels in the attempts of modern physicists to understand complex, nonintuitive aspects of the subatomic world. While not making the kind of broad claims eschewed above, I do suggest that this focused study has interesting implications since both the wave function and the poem's self force their respective sets of “readers” to confront questions of ultimacy—to consider, that is, epistemological and ontological issues of more than passing interest to students of science as well as those of metaphysics and theology.     

When Subjectivism Matters

Abstract: In this article I consider when the question of whether entities exist subjectively (only in the minds of subjects) or objectively (in themselves, independently of the minds of subjects) is important, both theoretically and practically. I argue that when it comes to the metaphysics underlying three types of moral questions, broadly conceived, the subjectivity question does not matter practically, although it is widely thought to matter. Subjectivism does not matter in these moral questions in the same way(s) it matters in some nonmoral metaphysical issues. The moral questions I consider are the meaning of life, normative ethics, and the free‐will problem. The nonmoral issues I address are the existence of God, the traditional mind/body problem, and personal identity. I explain the difference by noting that certain metaphysical issues on the fact side of the fact/value distinction impinge on persons' lives more prominently than do the metaphysics behind the three moral questions.     

父母教养态度与儿童在2-4岁期间的问题行

考察父母的教养态度和儿童在2—4岁间的问题行为的发展变化。采用交叉时序滞后设计,对172名儿童从2岁起进行2年追踪,在被试2岁和4岁时,分别对他们的父母进行间卷调查。结果发现：儿童外显问题行为与父母教养态度的相互作用较强,儿童在2岁时的外显问题行为可以预测4岁时母亲的惩罚性,内隐问题行为与父母教养态度的相互作用较弱;从2岁到4岁之间,儿童外显问题行为具有较高的稳定性,内隐问题行为的稳定性相对略低,父母教养态度也都具有一定的稳定性。     

对肾移植输血问题的思考

就肾移植受者输血的几个问题进行了回顾和探讨。提出肾移植受者输血应该考虑的问题有：如何权衡输血对肾移植受者的有益作用与输血风险,输血医学的发展如何为肾移植提供更有力的保障,应该深入探讨输血有益于肾移植的机制,推进供者特异性输血在我国的应用。     

Competing stimulus assessments: A systematic review

The current review summarizes the literature on competing stimulus assessments (CSAs). CSAs are pretreatment assessments designed to systematically identify stimuli that reduce problem behavior (PB), ostensibly through reinforcer competition or substitution. We report on the participant characteristics, outcomes, and predictive validity of published CSAs that included (a) no-stimulus control trial(s), (b) test trials during which each stimulus was available singly and noncontingently, and (c) measurement of PB and stimulus engagement or contact. Results showed that CSAs have broad utility across a variety of topographies and functions of PB. In the majority of CSA applications for which extended analyses, or validations, were performed, stimuli shown to reduce PB during the CSA produced similar reductions during extended analysis. This was the case regardless of topography or function of PB, or whether the stimuli were assumed to be “matched” to the stimulation thought to be produced by PB. Implications for future research are discussed.     

In search of the ‘Aha!’ experience: Elucidating the emotionality of insight problem‐solving

Although the experience of insight has long been noted, the essence of the ‘Aha!’ experience, reflecting a sudden change in the brain that accompanies an insight solution, remains largely unknown. This work aimed to uncover the mystery of the ‘Aha!’ experience through three studies. In Study 1, participants were required to solve a set of verbal insight problems and then subjectively report their affective experience when solving the problem. The participants were found to have experienced many types of emotions, with happiness the most frequently reported one. Multidimensional scaling was employed in Study 2 to simplify the dimensions of these reported emotions. The results showed that these different types of emotions could be clearly placed in two‐dimensional space and that components constituting the ‘Aha!’ experience mainly reflected positive emotion and approached cognition. To validate previous findings, in Study 3, participants were asked to select the most appropriate emotional item describing their feelings at the time the problem was solved. The results of this study replicated the multidimensional construct consisting of approached cognition and positive affect. These three studies provide the first direct evidence of the essence of the ‘Aha!’ experience. The potential significance of the findings was discussed.