汉语双字词在心理词典中的表征方式:来自fNIRS的证据

以汉语双字构成的真词与假词为实验材料,22名大学生为被试,采用功能性近红外脑成像技术(f NIRS)和事件相关设计,考察被试在完成词汇判断任务时的大脑激活模式,探索汉语双字词在心理词典中的表征方式。结果发现:(1)在完成真假词判断任务时,被试大脑左侧额叶和左侧颞叶均被激活;(2)与判断假词相比,被试在判断真词时显著地激活左额上回和左额中回。这一结果说明汉语双字词在心理词典中是混合表征的。     

Judging the implications of a concession: Conversational distance and belief bias effects

An arguer's position at a given point in an argument can be characterized as a set of commitments. The present study considers the perceptions of ordinary language users about the implications of making a concession for the contents of the conceder's commitment set. In particular, we examine two sources of influence on such lay perceptions—conversational distance (i.e., the number of turns separating the concession from commitments incurred earlier in the argument) and an individual's prior beliefs regarding the content of the argument. Across two studies, college students were administered an argument task assessing the extent to which a concession by the protagonist of an argument on the last move indicated changes to other commitments incurred earlier in the argument. Results indicated that participants were more likely to judge a concession as indicating a change in prior commitments if (a) the commitment was incurred later in the argument than earlier, and (b) the participant disagreed with the protagonists’ thesis in the argument. In addition, performance on deductive reasoning tasks predicted individual differences in the conversational distance effect, but not the belief bias effect.     

Common magnitude representation of fractions and decimals is task dependent

Although several studies have compared the representation of fractions and decimals, no study has investigated whether fractions and decimals, as two types of rational numbers, share a common representation of magnitude. The current study aimed to answer the question of whether fractions and decimals share a common representation of magnitude and whether the answer is influenced by task paradigms. We included two different number pairs, which were presented sequentially: fraction–decimal mixed pairs and decimal–fraction mixed pairs in all four experiments. Results showed that when the mixed pairs were very close numerically with the distance 0.1 or 0.3, there was a significant distance effect in the comparison task but not in the matching task. However, when the mixed pairs were further apart numerically with the distance 0.3 or 1.3, the distance effect appeared in the matching task regardless of the specific stimuli. We conclude that magnitudes of fractions and decimals can be represented in a common manner, but how they are represented is dependent on the given task. Fractions and decimals could be translated into a common representation of magnitude in the numerical comparison task. In the numerical matching task, fractions and decimals also shared a common representation. However, both of them were represented coarsely, leading to a weak distance effect. Specifically, fractions and decimals produced a significant distance effect only when the numerical distance was larger.     

Influence of bidirectional perspective on learning routes and spatial layout

The capacity to remain spatially oriented is an essential function in our day to day lives and it seems that the form in which we acquire the spatial information affects the way in which the spatial knowledge is represented in our memory. The goal of this research was to investigate whether the acquisition of spatial information through the learning of three routes within an immersive environment was improved or impaired when participants have access to the backward perspective in addition to the forward perspective. Results, both in reproduction and drawing tasks, showed a poorer performance of the bidirectional group maybe due to the extra-effort involved in updating the spatial information trial by trial. However it seems that the experience enhanced the performance of the bidirectional group in one respect, as they were able to reduce significantly the number of error directions in the last path.     

Disproportionate Representation in Special Education: A Synthesis and Recommendations

Disproportionate representation of minority students in special education remains a very controversial, unresolved issue. This synthesis summarizes historical perspectives and current knowledge about disproportionate representation with respect to: (a) definitions of disproportionate representation and related issues of interpretation; (b) national and state-level estimates of disproportionality for four ethnic groups; (c) legal, policy, research and teacher education responses to disproportionality; and (d) hypothesized causes and predictors of disproportionality. Authors stress the need for: coherent and well-articulated conceptual frameworks, responsible use and representation of data, research dialog that is informed by appreciation of the complex sociopolitical history and current context, and the need for effective advocacy to improve the educational success of minority students.     

Palestinian Educational Philosophy Between Past and Present

The article discuses the education issue as a central and decisive factor inshaping, reproducing and representing individual and collective identity.I present the Palestinian case study because the Palestinian people are atthe present in a very critical period of constructing their national identityand education is part of the nation-building project. I have chosen to studytwo periods in the life of Palestinians, 1972 during the revolution and thepresent 1999 the start of the establishment of an independent Palestinianentity and to examine how the economic, social, political conditions etc.affect the formation of the educational philosophy of those periods; aneducational philosophy that will affect the formation of education and theformation of private and collective consciousness.     

Symbolic Representation by Pigeons

The capacity for symbolic representation is a prerequisite for the development of human language because words, the basic units of language, are symbols that represent things. But symbolic representation may also serve a nonlinguistic role of organizing events into categories having the same meaning, and such a capacity could have considerable survival value for many species. In a number of experiments, my co-workers and I have found that pigeons that are trained to treat two different stimuli similarly also learn that those stimuli are commonly represented and, thus, that they have the same meaning. We have demonstrated evidence for such common representations in a number of ways, but perhaps the most convincing is when pigeons learn a new association involving one of the presumed commonly represented stimuli, and without further training demonstrate that they have learned a similar association involving the other stimulus. Furthermore, we have found that when pigeons are trained to treat two stimuli similarly, one of those stimuli is represented in terms of the other. These results have implications not only for the generality of cognitive processes across species, but also for the generality of symbolic representation beyond language use.     

Delayed imitation of complex behavioural sequences by 14- to 16-month olds

The present study was conducted to determine if children under the age of 18 months can exhibit delayed imitation of three-event sequences when they have no opportunity to practice. Twenty-three 14- to 16-month-old children underwent two different imitation conditions. In the practice condition the children could imitate the sequence immediately after modelling; then they were tested 1 or 7 days later. In the no practice condition the children had the chance to imitate only on the test day. Children were able to imitate the sequences under both conditions irrespective of the delay period. They produced significantly more target actions, and more target actions in the correct order, in the test phase and cued recall phase, compared with the baseline. There were no differences between the two conditions with a 1-day delay period, but after a 7-day delay, the number of target actions produced during the practice condition was significantly higher than those in the no practice condition. The results are discussed in terms of nonverbal mimetic representations. © 1998 John Wiley & Sons, Ltd.