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.     

Visual pattern memory requires foraging function in the central complex of Drosophila

The role of the foraging (for) gene, which encodes a cyclic guanosine-3',5'-monophosphate (cGMP)-dependent protein kinase (PKG), in food-search behavior in Drosophila has been intensively studied. However, its functions in other complex behaviors have not been well-characterized. Here, we show experimentally in Drosophila that the for gene is required in the operant visual learning paradigm. Visual pattern memory was normal in a natural variant rover (for(R)) but was impaired in another natural variant sitter (for(S)), which has a lower PKG level. Memory defects in for(S) flies could be rescued by either constitutive or adult-limited expression of for in the fan-shaped body. Interestingly, we showed that such rescue also occurred when for was expressed in the ellipsoid body. Additionally, expression of for in the fifth layer of the fan-shaped body restored sufficient memory for the pattern parameter "elevation" but not for "contour orientation," whereas expression of for in the ellipsoid body restored sufficient memory for both parameters. Our study defines a Drosophila model for further understanding the role of cGMP-PKG signaling in associative learning/memory and the neural circuit underlying this for-dependent visual pattern memory.     

对“家属签字”制度的立法思考

李丽云悲剧的发生,使《医疗机构管理条例》第三十三条规定的“家属签字”制度成为公众及法律界人士关注的焦点。“家属签字”制度受到道德和法律的双重拷问。从“家属签字”制度中潜在的法律推定出发,对“家属签字”制度的正当性依据、“特殊情况”下对患者的求生推定等六方面问题做些有益探讨,以期完善我国医疗管理法律法规。     

酒依赖与酒文化

作为一种精神障碍,越来越多的与饮酒有关的问题在我国引起了专业人员的重视。酒依赖不仅对个体的心理和躯体健康有害,还会引起一系列的社会问题。对酒这种精神活性物质作了多维度的评价,描述了形形色色的酒文化现象,探讨了我国酒文化在饮酒及饮酒相关问题发生中的作用。     

开端、裂缝与未来——海德格尔与德里达对"阿那克西曼德之箴言"的双重解读

该文考察了海德格尔与德里达对阿那克西曼德的一条箴言的两种不同解读。海氏从其存在论视野出发,认为该箴言所传达的是古希腊人对于在场与在场者的基本经验。海氏的解读赋予了“聚集”、“嵌合”、“一”以优先性,认为开端处的“裂缝”是消极的、派生的,必须要被克服。但德里达认为海氏的解读错失了另一种本源意义上的“裂缝”。这种“裂缝”不仅不应当被克服,反而应当在开端处就予以保持,如此才能给他者、未来和正义的到来保有一线机会。这两种不同的解读实质上反映了关于开端、历史与未来的两种不同思想。     

论道德能力

道德能力是一个很重要的概念。罗尔斯就把道德能力作为考察和建构现代社会的逻辑起点和价值支点,以此为基础寻求自由和平等的结合方式,安排社会的基本结构。在这里,道德能力不只是一个道德心理学的概念,更是一个道德哲学的概念。其内涵可以概括为三个层面,即合理的价值观、正义感和仁爱心、自主意识和责任感。一、合理的价值观:道德能力的实质罗尔斯把社会理解为一个公平的合作体系,对参与合作的人提出了特定的要求。他认为,合作者必须具备两种基本的道德能力,一是正义感,即一种能够了解、应用并依正义原则行事的能力;二是善观念,即具有一种…     

高级职业经理人胜任特质评定探索

为了方便企业甄选所需要的高级管理人才,本文就“高级职业经理人胜任特质评定量表”的编制过程及其量表的结构分析做一报告。该量表分为认知基质、组织协调、领导力、个性倾向和自我调节五个纬度和一个测谎的分量表。本研究立足于中国本土文化,采用小组中心访谈和多种统计分析技术对中国的高级职业经理人的胜任特质进行测评,结果显示总量表和各纬度上的项目具有较高的同质性信度和结构效度,具有较好的鉴别力。     

大学生因特网成瘾障碍的研究

本研究根据目前广泛认可的因特网成瘾障碍(Internet Addiction Disorder,IAD)诊断标准自编问卷,调查了上海市6所高校370名大学生的上网情况。结果表明:(1)自编问卷质量的各指标皆良好,问卷具有较好的稳定性和准确性。(2)上海市大学生IAD的发生率大约为8.1%。(3)男生比女生、理科比文科、大二年级比其它年级的学生陷入网络的程度深。(4)上网者每周的上网时间、使用网络工具的数量、上网动机的数量与使用网络的程度相关。(5)IAD者在网络使用的特点上明显不同于非IAD者(N-IAD者)。     

情绪启动研究的实验范式

情绪启动是探讨情绪和态度自动激活的有效方法,近期其研究范式有了较大的发展,相继产生了经典情绪启动实验、阈下情绪启动实验、向后情绪启动实验以及情绪启动与其他范式相结合的实验等较有影响的研究范式。文章分别梳理了这些范式及其研究结果,并在此基础上,总结研究所采用的范式并展望今后研究的发展趋势。