Involuntary memories and restrained eating

Most involuntary memories are elicited by external cues (e.g., smells, sounds) that have unique associations with specific memories (Berntsen’s cue-retrieval hypothesis), but involuntary memories can sometimes be elicited by weak, even imperceptible, cues that raise the activation level of an already primed memory (Berntsen’s motivation-priming hypothesis) to also reach conscious awareness during times of low attentional focus. The current study examined the effects of a motivation bias (restrained eating) on the involuntary memories recorded in daily diaries for seven days by 56 female participants. A large proportion of the involuntary memories were elicited by food-related cues and occurred in food-related contexts. A significant correlation was found between the participants’ scores on a restrained eating scale and the percentage of involuntary memories involving cooking and eating content. These results parallel previous research involving voluntary memory retrievals during restrained eating.     

无意视盲的认知神经机制

无意视盲现象是指即使某些刺激物出现在视野中, 观察者也并没有觉察到这些刺激物的存在。这种现象在我们的现实生活中普遍存在, 它是许多交通和医疗事故的罪魁祸首。回顾前人的研究结果我们发现, 从认知行为角度出发, 无意视盲主要由两方面原因引起, 即“资源有限”与“注意定势”。一般情况下, “资源有限”与“注意定势”会共同导致无意视盲; 但有时候, “注意定势”也会独立于“资源有限”直接导致无意视盲。另外, 从大脑神经机制的角度来看, “资源有限”与“注意定势”作用于大脑加工的中后期, 即使产生无意视盲, 意识加工脑区对非预期刺激也进行了一定的认知加工, 但是否能进入到意识层面, 一方面取决于刺激呈现后中期枕顶部位的意识输入, 另一方面取决于与刺激驱动相关的颞顶联合区的激活程度以及与记忆负荷相关的顶内沟的抑制程度。     

Conscious knowledge influences decision‐making differently in substance abusers with and without co‐morbid antisocial personality disorder

Decision‐making impairment, as measured by the Iowa Gambling Task (IGT), is a consistent finding among individuals with substance use disorder (SUD). We studied how this impairment is influenced by co‐morbid antisocial personality disorder (ASPD) and conscious knowledge of the task. Three groups were investigated: SUD individuals without co‐morbid ASPD (n = 30), SUD individuals with co‐morbid ASPD (n = 16), and healthy controls (n = 17). Both SUD and SUD+ASPD participants had poor overall IGT performance. A block‐by‐block analysis revealed that SUD participants exhibited slow but steady improvement across the IGT, whereas SUD+ASPD participants exhibited initial normal improvement, but dropped off during the last 40 trials. Conscious knowledge of the task was significantly correlated to performance for controls and SUD participants, but not for SUD+ASPD participants. Our findings suggest that decision‐making proceeds differently in SUD and SUD+ASPD individuals due to differences in acquisition and application of conscious knowledge.     

测试效应：致力于有效学习的基础研究

学习与记忆研究领域关于测试效应的研究重新审视了“测试”的作用。测试除了是衡量学习程度的工具,它对学习的作用相当于甚至大于同等时间的“学习”;相对于重复学习,测试使学习者对学习的元认知判断更准确;学习过程中的自我测试虽然可能延缓学习的进程,但却可促进有效学习。课堂小测或培养学生自我测试策略有助于其知识更好地保持于长时记忆中。     

线索强度对测试效应的调节:时间间隔上的差异

本研究采用不同线索强度(强/弱)的中文词对, 选取大学生被试126人, 考察了不同学习方式(重学/测试)在不同时间间隔(5分钟/2天)最终自由回忆测试成绩上的差异。结果发现:在强线索强度词对上, 学习方式主效应显著, 测试条件的回忆成绩在5分钟以及2天后均高于重学条件;而在弱线索强度词对上, 学习方式与间隔时间交互作用显著, 5分钟时重学条件与测试条件的记忆成绩差异不显著, 而2天后测试条件的记忆成绩却显著高于重学条件。结果表明词对的线索强度能够调节测试对不同时间间隔记忆保持的促进作用, 支持了精细提取假设。     

词窗口条件下老年阅读者信息提取过程的眼动研究

本研究以眼动仪为工具,通过消失文本范式考察老年阅读者从视觉刺激中提取语义信息的必要呈现时间。实验一发现,老年阅读者阅读消失文本的视觉刺激必要呈现时间在120 ms以后。实验二在实验一的基础上,将消失时间设置为120 ms1、40 ms、160 ms、180 ms和200 ms。研究结果发现,老年阅读者阅读消失文本的必要延迟时间是200 ms,结果支持眼动控制理论中认知控制模型。     

Faceted Classification for the Web

The article describes the nature of a faceted classification, and its application in document retrieval. The kinds of facet used are illustrated. Procedures are then discussed for identifying facets in a subject field, populating the facets with individual subject terms, arranging these in helpful sequences, using the scheme to classify documents, and searching the resultant classified index, with particular reference to Internet search.     

From the Universe of Knowledge to the Universe of Concepts: The Structural Revolution in Classification for Information Retrieval

During the twentieth century, bibliographic classification theory underwent a structural revolution. The first modern bibliographic classifications were top-down systems that started at the universe of knowledge and subdivided that universe downward to minute subclasses. After the invention of faceted classification by S.R. Ranganathan, the ideal was to build bottom-up classifications that started with the universe of concepts and built upward to larger and larger faceted classes. This ideal has not been achieved, and the two kinds of classification systems are not mutually exclusive. This paper examines the process by which this structural revolution was accomplished by looking at the spread of facet theory after 1924 when Ranganathan attended the School of Librarianship, London, through selected classification textbooks that were published after that date. To this end, the paper examines the role of W.C.B. Sayers as a teacher and author of three editions of The Manual of Classification for Librarians and Bibliographers. Sayers influenced both Ranganathan and the various members of the Classification Research Group (CRG) who were his students. Further, the paper contrasts the methods of evaluating classification systems that arose between Sayers’s Canons of Classification in 1915–1916 and J. Mills’s A Modern Outline of Library Classification in 1960 in order to demonstrate the speed with which one kind of classificatory structure was overtaken by another.

冲突适应独立于意识：来自行为和ERP的证据

尽管已有研究发现诸如抑制控制和任务转换等认知控制功能独立于意识, 但是对冲突适应是否需要意识的参与目前还存在激烈的争论。为了进一步探讨此问题, 本研究记录了18名被试在完成箭头偏对比掩蔽任务(meta-contrast masking task)时的行为和脑电数据。结果显示, 在有意识和无意识条件下在反应时和额中N2和中顶P3波幅上均表现出了显著的冲突适应效应。这不仅表明冲突控制独立于意识, 而且也表明先前无意识经验对人类信息加工系统的适应性调节作用。本研究对认识认知控制和意识的本质具有重要意义, 也为建构认知控制与意识关系的理论提供了启示。