Context extinction and associative learning in Lymnaea

Aerial respiratory behavior in the pond snail Lymnaea was operantly conditioned so that snails learned not to perform aerial respiration in a hypoxic environment. Snails were trained in either the standard context (no food odorant) or a carrot (food-odorant) context. An operant training procedure of two 45-min training sessions with a 1-h interval between the sessions followed by a third 45-min training session 18 h later was sufficient to produce associative learning and long-term memory (LTM) that persisted for at least 5 days. If, however, following the third operant training session snails received three 45-min extinction training sessions, with each extinction session separated by at least a 1-h interval, LTM was not observed when tested the following day. That is, the memory was extinguished. Extinction, however, did not occur if the context of the extinction training was different from the context of the associative training. That is, in the snails trained in the standard context, extinction did not occur if the extinction training sessions were performed in the food-odorant context and vice versa.     

When disfluency is—and is not—a desirable difficulty: The influence of typeface clarity on metacognitive judgments and memory

There are many instances in which perceptual disfluency leads to improved memory performance, a phenomenon often referred to as the perceptual-interference effect (e.g., Diemand-Yauman, Oppenheimer, & Vaughn (Cognition 118:111–115, 2010); Nairne (Journal of Experimental Psychology: Learning, Memory, and Cognition 14:248–255, 1988)). In some situations, however, perceptual disfluency does not affect memory (Rhodes & Castel (Journal of Experimental Psychology: General 137:615–625, 2008)), or even impairs memory (Glass, (Psychology and Aging 22:233–238, 2007)). Because of the uncertain effects of perceptual disfluency, it is important to establish when disfluency is a “desirable difficulty” (Bjork, 1994) and when it is not, and the degree to which people’s judgments of learning (JOLs) reflect the consequences of processing disfluent information. In five experiments, our participants saw multiple lists of blurred and clear words and gave JOLs after each word. The JOLs were consistently higher for the perceptually fluent items in within-subjects designs, which accurately predicted the pattern of recall performance when the presentation time was short (Exps. 1a and 2a). When the final test was recognition or when the presentation time was long, however, we found no difference in recall for clear and blurred words, although JOLs continued to be higher for clear words (Exps. 2b and 3). When fluency was manipulated between subjects, neither JOLs nor recall varied between formats (Exp. 1b). This study suggests a boundary condition for the desirable difficulty of perceptual disfluency and indicates that a visual distortion, such as blurring a word, may not always induce the deeper processing necessary to create a perceptual-interference effect.     

Energetic effects of dopants on the eutectoid decomposition of Nb–Si in situ composites

The influences of doping elements (Ti, Zr, Hf, V, Ta, Cr, Mo, W and Al) on the heats of formation of Nb, Nb₅Si₃ and Nb₃Si have been studied using first-principles pseudopotential plane-wave method based on density functional theory. Site preferences of dopants in Nb₅Si₃ and Nb₃Si intermetallics are first determined by comparing the heats of formation of the systems with different site occupations of the doping atoms. The partitionings of dopants between the equilibrium phases Nb and Nb₅Si₃ of Nb–Si in situ composites are then discussed and compared with experimental results. Phase partitioning behaviours of the alloying elements are found to depend strongly on the number of their valence electrons. By calculating the enthalpy of reaction regarding the eutectoid decomposition of Nb₃Si phase, we conclude that Ta is a Nb₃Si stabiliser while other dopants destabilise Nb₃Si at the investigated concentration.     

熟练中-英双语者对多义词早期识别中语义和语法的相互作用

以中、英文的多义词为材料, 采用跨语言隐蔽启动的实验范式, 考察在无语境条件下熟练中–英双语者对多义词的早期识别。结果表明：(1)熟练中–英双语者表现出显著的隐蔽翻译启动效应, 当目标词是主要翻译对等词时, 启动效应更加显著。(2)翻译对等词的性质、多义词的义项联系程度以及是否是词类歧义词都影响熟练中–英双语者对中、英多义词的早期加工。(3)在无语境条件下, 词类信息在意义通达的早期就已经激活, 并且同语义信息之间存在着交互作用。根据研究结果, 扩展和修正了分布式概念表征模型。     

Chinese Corporate Social Responsibility by Multiple Objective Portfolio Selection and Genetic Algorithms

In this paper, we study corporate social responsibility (CSR) in China through the prism of investments. We work with large stocks and assess their CSR performance from agency CSR data. We formulate Chinese CSR by a multiple objective extension of a traditional portfolio selection model and analytically solve the extension. We also solve the extension by a genetic algorithm and directly evaluate the algorithm's performance against the analytical solution. The multiple objective formulation is tested by randomly choosing nondominated portfolios with out‐of‐sample data to identify nondominated portfolios that outperform the 1/n portfolio (equally weighted portfolio). Copyright © 2013 John Wiley & Sons, Ltd.     

副中央凹信息量对中文朗读和默读的调节作用

以往研究者对默读过程中的副中央凹加工进行了大量研究,但很少探讨这一加工进程在朗读过程中的作用.本研究采用移动窗口范式,通过改变移动注视窗口的大小来操纵副中央凹获得的信息量(1字窗口、3字窗口和正常阅读),探讨在中文默读和朗读条件下副中央凹获得的信息量的差异.结果表明,朗读比默读占用更多的资源,与默读相比,朗读时的注视时间更长、注视次数更多;重要的是,副中央凹信息可以提高朗读和默读过程中的阅读速度.然而,与朗读过程相比,副中央凹信息的促进作用在默读过程中更为明显.因此,副中央凹信息量对中文朗读和默读都起着调节的作用.     

Hesitation in communication: Does minority status delay responses?

Past studies indicated that people in a minority (vs. majority) position are slower to express their public/political opinion, and the larger the difference between the size of the two positions, the slower the response. Bassili termed this the minority‐slowness effect (MSE). In the current study, two experiments were conducted to demonstrate that MSE extends to people's understanding of utterances and explored the cognitive basis for this. Participants were asked to judge if an utterance is a ‘direct’ or an ‘indirect’ expression. The results show that participants in the minority (vs. majority) took longer to respond, and the larger the difference between the size of majority and minority, the longer the response latency (Study 1a). Furthermore, participants were aware of their own minority position (Study 1b). In Study 2, when participants were deprived of cognitive resources, MSE disappeared, presumably because participants lack the cognitive resources required to conform to utterance interpretation as favoured by the majority.     

中医问诊的生物心理社会医学模式

问诊是中医临床诊查疾病的重要方法之一.在内容上,中医问诊涵盖了对患者生物、心理和社会因素的全面观察和分析;在方式上,中医问诊重视患者主诉,并对患者主动而有针对性地询问和沟通.中医问诊是医生与患者主动交流互动的平台,体现了现代生物心理社会医学模式,对当前医学模式转变和医患关系改善有重要的参考意义.     

医患会话中的病因自我解释

医患会话中,患者常在被告知诊断结果前进行自我诊断,解释疾病产生的原因,在医生的专业技能与患者自我诊断技能不断协商讨论之中,医患双方可能产生相互影响。首先提出患者病因自我解释的语言特点,分析患者病因自我解释的两难决策。结合语料实例,指出医生回应患者病因解释的三种结构模式,最后对医生的回应策略给出建议。