Spatial separation between targets constrains maintenance of attention on multiple objects

Humans are limited in their ability to maintain multiple attentional foci. In attentive tracking of moving objects, performance declines as the number of tracked targets increases. Previous studies have interpreted such reduction in terms of a limit in the number of attentional foci. However, increasing the number of targets usually reduces spatial separation among different targets. In this study, we examine the role of target spatial separation in maintaining multiple attentional foci. Results from a multiple-object tracking task show that tracking accuracy deteriorates as the spatial separation between targets decreases. We propose that local interaction between nearby attentional foci modulates the resolution of attention, and that capacity limitation from attentive tracking originates in part from limitations in maintaining critical spacing among multiple attentional foci. These findings are consistent with the hypothesis that tracking performance is limited not primarily by a number of locations, but by factors such as the spacing and speed of the targets and distractors.     

历史进步的寓意——关于历史普遍性与历史特殊性的解读

两百多年前,哲学家康德提出了一个十分重要的历史哲学命题:世界公民观点之下的普遍历史观念何以认知并读写?康德认为,人类的历史进程不过是大自然的一个隐秘计划的实施过程,它充满了个体、民族与类的种种对抗,贯通着历史普遍性与历史特殊性的矛盾冲突.     

项目特征曲线等值的抽样误差

现在,等值越来越受到各考试测验机构及测量学研究人员的重视,特别是项目反应理论等值的优越性更使他们有了信心。然而,很多人却没有注意到被试能力分布形态可能给等值结果带来的影响效果及程度。本研究以项目反应理论两级记分模型的项目参数等值在不同被试能力分布形态下的结果差异作为重点,探讨被试抽样偏差可能给项目特征曲线等值带来的误差问题。研究结果表明,被试能力分布形态会显著地影响项目参数等值的系数,特别地,能力分布的偏态系数与等值方程的截距存在显著的线性相关关系,但能力分布形态的变化对等值方程中斜率的影响并不明显     

下腰痛综合征的诊治与人文思想

下腰痛是一种常见的骨科病症,轻者可影响患者生活,重者可使患者丧失劳动力。它的发病原因有很多,治疗方法各有不同。在下腰痛的诊断中要按照适度医疗的原则选择合适的检查;在下腰痛的治疗中须按照最优化医疗的原则选择最佳的治疗方案。在治疗中要注意结合人文思想来提高下腰痛的治疗效果。     

检验导出的等值新方法及其表现探讨

该文受Berkson将检验方法用于估计未知参数的启发,根据三个拟合优度统计量导出三种新的求取等值系数的方法,即:平方根等值方法(Square Root criterion,SQRTcrit)、对称相对熵等值方法(Symmetric Relative Entropy criterion,SREcrit)、加权等值方法(Weighted criterion,Wcrit),即Haebara准则的加权式。虽然在被检验的两个分布列很接近时,这三个多项拟合优度检验方法是渐近等价的,然而用它们求取等值系数时,Monte-Carlo模拟结果表明这三种新等值方法的行为表现存在差异。它们之间的差异和随机误差的大小有密切关系,即与项目参数估计的精度有关;还与等值系数A的范围有关。     

道德金律的内涵本质及其当代意义

对"己所不欲,勿施于人"道德金律正反两方面的表述进行分析,指出其存在某种缺陷,肯定其已具备的道德本质精神.在当代,充分揭示和确定其内在的基本价值理念,使之转化为人们的现实基本权利并加以践履,是十分重要与必要的.     

投壶话动在两汉魏晋时期的道教化

投壶活动在我国历史非常久远,至迟在周朝时期已成为大型宴饮礼仪上的一项重要活动内容,由于它可能是承袭射礼而来,有着许多繁琐的礼节;后经秦汉时期的民间化、民间宗教和道家求仙思想的影响,约在魏晋时期被纳人道家视野,并成为道教仙境的文化象征.下面从史籍、图像和出土文献等几个方面试述这一嬗变轨迹.     

Acquisition of habitual visual attention and transfer to related tasks

Extensive research has shown that statistical learning affects perception, attention, and action control; however, few studies have directly linked statistical learning with the formation of habits. Evidence that learning can induce a search habit has come from location probability learning, in which people prioritize locations frequently attended to in the past. Here, using an alternating training–testing procedure, we demonstrated that the initial attentional bias arises from short-term intertrial priming, whereas probability learning takes longer to emerge, first reaching significance in covert orienting (measured by reaction times) after about 48 training trials, and in overt orienting (measured by eye movements) after about 96 training trials. We further showed that location probability learning is persistent after training is discontinued, by transferring from a letter search task to a scene search task—emulating another characteristic feature of habits. By identifying the onset of probability learning and investigating its task specificity, this study provides evidence that probability cuing can induce habitual spatial attention.     

Implications of the Dutch Book: Following Ramsey��s axioms

The Dutch Book Argument shows that an agent will lose surely in a gamble (a Dutch Book is made) if his degrees of belief do not satisfy the laws of the probability. Yet a question arises here: What does the Dutch Book imply? This paper firstly argues that there exists a utility function following Ramsey’s axioms. And then, it explicates the properties of the utility function and degree of belief respectively. The properties show that coherence in partial beliefs for Subjective Bayesianism means that the degree of belief, representing a belief ordering, satisfies the laws of probability, and that coherence in preferences means that the preferences are represented by expected utilities. A coherent belief ordering and a utility scale induce a coherent preference ordering; a coherent preference ordering induces a coherent belief ordering which can be uniquely represented by a degree-of-belief function. The preferences (values) and beliefs are both incoherent or disordered if a Dutch Book is made.     

大学生自我同一性发展特点研究

目的:调查并探讨大学生自我同一性状态发展特点。方法:从湖南某大学随机抽取320名大学生,采用王树青等人修订的EOM-EIS-II量表作为测量青少年自我同一性的工具。结果:(1)大学生自我同一性的性别、独生和非独生、城乡的差异比较结果显示,不同性别、独生非独生大学生在自我同一性的一些维度上存在显著差异,而来自城市和来自农村的大学生之间不存在差异;(2)不同年级大学生的同一性状态得分的方差分析结果显示,不同年级大学生在总体获得、总体延缓、总体早闭、意识早闭、人际早闭、人际延缓和人际获得7个维度上差异显著。结论:大学生自我同一性的发展存在一定的不平衡性。