预防性气管切开在上段食管癌手术中的效用

探讨预防性气管切开在伴慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)且长期大量吸烟的上段食管癌术后的应用,分析其对患者术后肺部感染、低氧血症、心律失常的影响.回顾性分析我科2011年6月~2013年1月伴有COPD及长期大量吸烟的上段食管癌行手术切除颈部吻合的病例,并分为预防性气管切开组和非预防性气管切开组.统计并分析两组术后肺部感染、低氧血症、心律失常等并发症的发生情况.结果对于上段食管癌行根治手术的患者,尤其是伴有长期大量吸烟及COPD的患者来说,预防性气管切开可以起到预防术后呼吸道并发症的发生,并能减少术后心律失常的发生的作用,其可以做为上段食管癌重症患者的一种预防围手术期并发症的方式.     

高考数学试卷多维项目反应理论的分析及应用

高考数学学科试卷的试题综合性较强,一道试题通常考查多种能力属性,而基于单维性假设下的经典测量理论和传统的项目反应理论无法完成该种情形下试卷测量性能分析和考生作答表现分析.本文以MIRT理论为基础,使用CONQUEST软件为工具进行分析,可以获得试卷内部不同能力维度之间的相关以及考生不同维度的能力参数,为提升命题质量和改进教学提供了依据,表明MIRT具有很好的应用前景.由于MIRT理论的复杂性以至于目前分析软件的不足制约其进一步的深入应用,这是今后应该深入研究的问题.     

行为决策中的基线比例忽略：心理机制与影响因素

基线比例忽略是指个体进行决策和判断时不能充分利用或者忽略基线比例而偏好新信息的现象。该现象普遍存在于日常行为与决策的许多领域,尤其显著表现在临床医疗领域,因此对这一现象的研究具有重要的应用价值。目前,基线比例忽略的心理机制主要有双加工理论和因果贝叶斯框架等。基线比例忽略的影响因素主要包括认知能力、年龄、基线比例的表述形式等。未来的研究需要从基线比例忽略的神经机制、影响因素以及应用研究的拓展等方面着手。     

Culture,social class,and independence–interdependence: The case of Chinese adolescents

Social class demarcates sociocultural environments differing in the relative abundance and scarcity of resources, which in turn differentially afford independent and interdependent psychological processes. The relationships between social class and psychological processes are well documented in Western populations but less so elsewhere. Examining such a relationship is particularly important in China, with its unique historical and sociocultural issues surrounding social class. This research examined the relationship between social class and independence–interdependence among Chinese adolescents (N = 1184). Findings were consistent across a diverse array of psychological processes implicated by independence–interdependence: Participants with well‐educated parents experienced more socially disengaging emotions and a higher level of self‐esteem, and were more inclined toward dispositional attribution and focused attention, compared to participants with less well‐educated parents. These findings highlight the cross‐cultural commonality in the relationship between social class and independence–interdependence.     

Refining the two‐parameter testlet response model by introducing testlet discrimination parameters

For testlet response data, traditional item response theory (IRT) models are often not appropriate due to local dependence presented among items within a common testlet. Several testlet‐based IRT models have been developed to model examinees' responses. In this paper, a new two‐parameter normal ogive testlet response theory (2PNOTRT) model for dichotomous items is proposed by introducing testlet discrimination parameters. A Bayesian model parameter estimation approach via a data augmentation scheme is developed. Simulations are conducted to evaluate the performance of the proposed 2PNOTRT model. The results indicated that the estimation of item parameters is satisfactory overall from the viewpoint of convergence. Finally, the proposed 2PNOTRT model is applied to a set of real testlet data.     

On the Role of Goal Orientation Traits and Self-Efficacy in the Goal-Setting Process: Distinctions That Make a Difference

We conducted a field study to investigate how goal orientation traits and two variants of self-efficacy affect the goal-setting process and, in turn, performance. Participants were 255 college students enrolled in psychology or biochemistry courses at a large east-coast university in the People's Republic of China. Structural equation modeling analyses largely supported the argument that self-efficacy defined as a trait interacts with goal orientation traits, whereas self-efficacy defined as a state mediates the trait effects in the goal-setting process. The specific Trait × Trait interaction form was consistent with Dweck's original goal orientation theory and Brockner's behavior plasticity theory.     

Concept Abstractness and the Representation of Noun–Noun Combinations

Research on noun–noun combinations has been largely focusing on concrete concepts. Three experiments examined the role of concept abstractness in the representation of noun–noun combinations. In Experiment 1, participants provided written interpretations for phrases constituted by nouns of varying degrees of abstractness. Interpretive focus (the modifier, the head noun, or both) for each noun–noun phrase was evaluated. In Experiment 2, a different group of participants directly indicated which noun, the modifier or the head noun, was the focus of the meaning of each noun–noun phrase. Finally, participants in Experiment 3 assessed similarity of noun–noun phrases with overlapping modifiers. If abstractness of constituent nouns affects information distribution between modifier and head noun, it would accordingly affect similarity ratings for noun–noun phrases with overlapping modifiers. Results showed that the pattern of information distribution within a noun–noun phrase differed between phrases with abstract head nouns and phrases with concrete head nouns. Specifically, the center of representation was more on the head noun side for phrases with concrete head nouns, whereas the center seemed to shift to the direction of the modifier for phrases with abstract head nouns. Some issues related to effects of concept abstractness on noun–noun combinations are discussed.     

Abstract Rule Learning in 11- and 14-Month-Old Infants

This study tests the hypothesis that distributional information can guide infants in the generalization of word order movement rules at the initial stage of language acquisition. Participants were 11- and 14-month-old infants. Stimuli were sentences in Russian, a language that was unknown to our infants. During training the word order of each sentence was transformed following a consistent pattern (e.g., ABC–BAC). During the test phase infants heard novel sentences that respected the trained rule and ones that violated the trained rule (i.e., a different transformation such as ABC–ACB). Stimuli words had highly variable phonological and morphological shapes. The cue available was the positional information of words and their non-adjacent relations across sentences. We found that 14-month-olds, but not 11-month-olds, showed evidence of abstract rule generalization to novel instances. The implications of this finding to early syntactic acquisition are discussed.     

Biological motion cues trigger reflexive attentional orienting

The human visual system is extremely sensitive to biological signals around us. In the current study, we demonstrate that biological motion walking direction can induce robust reflexive attentional orienting. Following a brief presentation of a central point-light walker walking towards either the left or right direction, observers' performance was significantly better on a target in the walking direction compared with that in the opposite direction even when participants were explicitly told that walking direction was not predictive of target location. Interestingly, the effect disappeared when the walker was shown upside-down. Moreover, the reflexive attentional orienting could be extended to motions of other biological entities but not inanimate objects, and was not due to the viewpoint effect of the point-light figure. Our findings provide strong evidence that biological motion cues can trigger reflexive attentional orienting, and highlight the intrinsic sensitivity of the human visual attention system to biological signals.