上海市大学城学生网瘾调查报告

本调查使用大学生网络成瘾量表,调查了上海市大学城里1286名大学生.调查结果显示:大学城学生不同性别和年级在因特网成瘾障碍量表各维度上的差异不显著,其脱瘾综合症状明显.大学城学生不同性别和年级网络成瘾的发生率有显著差异.上海市大学城学生网瘾发牛率在总体、男生、大二、大四维度上显著低于全市大学生网瘾发生率.     

New Media and Event: A Case Study on the Power of the Internet

With the rapid growth of the number of netizens in China, the Internet has become one of the most important parts in the lives of people who not only can get more information on the Internet, but can also express their own views. In other words, the Internet has also become a part of real-world events. Drawing on a case study about ‘The Boycott of Carrefour’ in China during the spring of 2008, the paper first discusses the role and functions of new media during the incident. Through analyses of a story about the culture of labeling others and a conflict between burning a wrong flag in this case, the paper then explores the capriciousness of Chinese cyberspace. The author proposes an explanation on how the illusion of truth is generated on the Internet and then influences the events in the real world. The paper concludes that the Internet is not just a simple technological tool, but it is intertwined with the sociocultural contexts in which it is rooted.

剖宫产率上升探析

剖宫产作为产科分娩的干预手段,既可以挽救孕妇和胎儿的生命,又会对孕妇和胎儿带来某些预料不到的危险。近年来,许多国家的剖宫产率随着剖宫产术的推广不断上升,引起了社会各界的广泛关注。本文概述了国内外剖宫产率变化的主要特征,综述了导致剖宫产率上升的主要因素及社会各界对剖宫产率上升的不同看法。     

Frontal brain electrical activity (EEG) and heart rate in response to affective infant-directed (ID) speech in 9-month-old infants

Many studies have shown that infants prefer infant-directed (ID) speech to adult-directed (AD) speech. ID speech functions to aid language learning, obtain and/or maintain an infant's attention, and create emotional communication between the infant and caregiver. We examined psychophysiological responses to ID speech that varied in affective content (i.e., love/comfort, surprise, fear) in a group of typically developing 9-month-old infants. Regional EEG and heart rate were collected continuously during stimulus presentation. We found the pattern of overall frontal EEG power was linearly related to affective intensity of the ID speech, such that EEG power was greatest in response to fear, than surprise than love/comfort; this linear pattern was specific to the frontal region. We also noted that heart rate decelerated to ID speech independent of affective content. As well, infants who were reported by their mothers as temperamentally distressed tended to exhibit greater relative right frontal EEG activity during baseline and in response to affective ID speech, consistent with previous work with visual stimuli and extending it to the auditory modality. Findings are discussed in terms of how increases in frontal EEG power in response to different affective intensity may reflect the cognitive aspects of emotional processing across sensory domains in infancy.     

Further analysis of the matching law to describe two- and three-point shot allocation by professional basketball players

The matching law was used to analyze whether the proportion of shots taken from two- or three-point range would match the proportional reinforcement rates produced by those shots when the reinforcement rate of three-point shooting was changed. Rule changes in 1994 and 1997 altered the distance of the three-point line in the National Basketball Association, which created a quasiexperimental reversal design, thereby naturally changing three-point reinforcement rates. The present data partially confirmed predictions made by the matching law, in that increases in the relative rate of three-point shots attempted corresponded to increases in the relative rate of three-point shots made.     

Heart rate and blood pressure responses to a competitive role‐playing game

The effects of the outcome of competitive encounters on physiological parameters have been studied, especially testosterone levels, but hardly on other systems that, however, present a high sensitivity to stress. This study assessed the effect of a competitive game on heart rate (HR) and blood pressure (BP) in a sample of university students. In addition, the influence of anxiety and attributions of the outcome was also explored. Only winners significantly showed a rise in HR during the competition followed by a decrease along the posttask phase in addition to more internal attributions. On the contrary, the average HR for losers during the competition was lower compared with their baseline values. No differences depending on the outcome were found in BP. The cardiovascular response as well as the subjective interpretation of the outcome suggest a more active strategy employed by winners vs. a more passive strategy of losers. Future studies should specifically investigate the importance of coping strategies for psychophysiological adaptation to contests and for the outcome reached. This would permit an advance in the understanding of the role of individual differences in the processes of stress and in associated diseases. Aggr. Behav. 27:351–359, 2001. © 2001 Wiley‐Liss, Inc.     

认知诊断CAT中具有非统计约束选题方法的比较

项目曝光控制和内容约束关系到测验安全、测验的信度和效度, 是计算机化自适应测验(Computerized Adaptive Testing, CAT)中两类重要的非统计约束条件。本文在认知诊断CAT中针对内容约束和项目曝光控制要求, 运用5种方法选择测验项目。它们分别是：(1) Monte Carlo方法与项目合格方法相结合, 记为MC-IE; (2) Monte Carlo方法与最大优先指标方法相结合, 记为MC-MPI; (3) Monte Carlo方法与限制阈值方法相结合, 记为MC-RT; (4) Monte Carlo方法与限制进度指标方法相结合, 记为MC-RPG以及(5) Monte Carlo方法与最大后验概率方法相结合, 记为MC-PP。然后通过在线性、收敛、发散、无结构和独立五种属性结构下构建题库并运用重参化融融统和模型模拟被试反应比较它们的选题表现。研究发现, (1) 相同选题方法在不同属性结构下项目曝光率的分布类似, 测量精度按线性、收敛、发散、无结构和独立结构的顺序依次降低; (2) 相同属性结构下, 不同方法的测量精度高低依次为MC-PP、MC-IE、MC-RT、MC-MPI和MC-RPG方法; 项目曝光均匀性优劣依次为MC-RPG、MC-MPI、MC-RT、MC-IE和MC-PP方法。统一量纲值表明, MC-RPG方法的综合表现最好, MC-MPI方法的表现次之。     

判断与决策中的基线比例忽略

基线比例忽略是指在事件的判断中忽略相关事件统计学上的信息, 而只关注当前呈现的案例信息, 从而造成判断和决策偏差的一种现象。目前对这一现象的解释主要包括双加工理论和线性整合理论, 而影响基线比例忽略的因素有许多方面, 如信息特征、认知能力等等。在未来研究中, 应该深入分析双加工理论的作用机制以及依据模糊痕迹理论提出新的研究视角, 同时拓展在团体和公共领域中的应用性研究。     

不同注意资源水平上核心厌恶和道德厌恶刺激加工分离效应的ERPs研究

厌恶帮助人类避免接触生物病菌、社会道德威胁物。本研究采用“线索—靶”范式考察不同注意资源水平上核心和道德厌恶刺激的认知加工特征。结果发现,核心厌恶刺激诱发的P2波幅显著大于道德厌恶和中性刺激;有效线索下核心厌恶刺激的P3波幅与道德厌恶刺激间差异不显著,而无效线索下核心厌恶刺激的P3波幅显著大于道德厌恶。结果表明两类厌恶刺激在不同注意资源水平上存在加工分离效应,支持了厌恶情绪“异质性”的观点。