心房颤动的病因、发病机制与射频导管消融治疗现状

随着人们研究的不断深入,对心房颤动的病因、发病机制有了更新的认识。后者从起搏点兴奋性增高,折返机制,发展到对心肌袖、电重构的认识;以及肺静脉、迷走神经在阵发性心房颤动中的作用,遗传物质异质性及基因突变等。同样,心房颤动的射频导管消融治疗也取得了突破性的进展。     

情境相关性及其对“特质-工作结果”的调节作用

情境相关性是指当情境能够对个体表达特质提供相关行为的线索时, 该情境即具有相关性, 它和情境强度共同组成特质激活的潜能, 并在工业组织心理学中逐渐受到广泛关注。基于情境相关性有研究提出情境维度说, 建立特质激活与评估模型。受到情境中相关线索激活, 特质表达为工作行为。在与不同水平各个维度的线索相一致时, 工作行为被评估为工作绩效。研究表明, 情境调节变量可以在3个水平提供特质激活线索, 调节“特质&;#8722;工作结果”关系, 如任务水平的工作控制、群体水平的领导行为以及组织水平的领导&;#8722;成员交换(LMX)关系等。情境相关性研究在人才选任、绩效管理、改善生产等方面起到积极作用。     

如何建立聊天机器人与用户间的数字治疗联盟：关系线索的作用

近年来,研究者们将“治疗联盟”(Therapeutic Alliance,TA)的概念与在线自助干预(Internet-based Self-help Interventions,ISIs)相结合,以解决ISIs中用户参与度较低的问题。这种在数字环境中形成的TA,被称之为“数字治疗联盟”(Digital Therapeutic Alliance, DTA)。随着人工智能的迅速发展,聊天机器人可模拟人类指导,相对于传统ISIs程序更易于与用户建立关系,可通过友好、尊重、倾听、鼓励、真诚、理解、信任这几个关系线索来促进DTA的发展,为解决用户低参与度的问题提供了一种新思路。未来的研究可从影响因素、ISIs技术迭代、测量规范、实验操纵等方面对DTA作进一步的探索。     

When two sources of fluency meet one cognitive mindset

Fluency, the subjective experience of ease associated with information processing, has been shown to affect a host of judgments. Previous research has typically focused on specific factors that affect the use of a single, specific fluency source. In the present study we examine how cognitive mindsets, or processing modes, moderate fluency emanating from two simultaneous sources of fluency. As a cognitive mindset manipulation, participants performed Jacoby's process dissociation paradigm. Subsequently, participants engaged in a metamemory task that incorporates (and can separately measure the influence of) two simultaneous sources of fluency: familiarity and accessibility. Our results confirmed that our content-unrelated mindset procedure had affected the use of fluency. Moreover, the use of both fluency sources was attenuated, demonstrating the generality of the effect. The findings highlight the causal dependency of fluency on a complex, cognitively-rich environment.     

Discriminating direction of motion trajectories from angular speed and background information

The effects of a background scene on the perception of the trajectory of an approaching object and its relation to changes in angular speed and angular size were examined in five experiments. Observers judged the direction (upward or downward) of two sequentially presented motion trajectories simulating a sphere traveling toward the observer at a constant 3-D speed from a fixed distance. In Experiments 1–4, we examined the effects of changes in angular speed and the presence of a scene background, with changes in angular size based either on the trajectories being discriminated or on an intermediate trajectory. In Experiment 5, we examined the effects of changes in angular speed and scene background, with angular size either constant or consistent with an intermediate 3-D trajectory. Overall, we found that (1) observers were able to judge the direction of object motion trajectories from angular speed changes; (2) observers were more accurate with a 3-D scene background, as compared with a uniform background, suggesting that scene information is important for recovering object motion trajectories; and (3) observers were more accurate in judging motion trajectories based on angular speed when the angular size function was consistent with motion in depth than when the angular size was constant.     

Effects of retinal eccentricity and acuity on global-motion processing

The present study assessed direction discrimination with moving random-dot cinematograms at retinal eccentricities of 0, 8, 22, and 40?deg. In addition, Landolt-C acuity was assessed at these eccentricities to determine whether changes in motion discrimination performance covaried with acuity in the retinal periphery. The results of the experiment indicated that discrimination thresholds increased with retinal eccentricity and directional variance (noise), independent of acuity. Psychophysical modeling indicated that the results for eccentricity and noise could be explained by an increase in channel bandwidth and an increase in internal multiplicative noise.     

健康城市建设的新理念及其导向

健康城市的理论与实践的发展以及人类对健康及其决定因素认知的深入使健康城市的内涵和理念不断扩充,吸纳了健康的社会模式及健康决定因素的理念,为健康城市建设注入了新的机制,并成为健康城市建设发展的新导向.我国建设健康城市的实践,从基线评估、规划制定到建设推进,已着力体现国际上健康城市的新理念和导向.     

理想与长寿

记得,一位外国名作家说过：人类不会因为时间的推移而出现老人,而往往是因为理想的破灭才出现了逝者。初听起来,此话的确有些不太顺耳,但仔细想来却又不无道理。众所周知,人之所以能成为地球生物的灵长,进而主宰了世界,就是因为人类有比较发达的大     

以科学发展观统领社会主义新农村建设

社会主义新农村建设是事关中国社会主义现代化全局性的战略决策,必须以科学发展观作为根本的指导思想。以科学发展观统领社会主义新农村建设,要充分尊重农民在新农村建设中的主体地位,促进农村经济社会全面协调可持续地发展,走生产发展、生活宽裕、生态良好的文明发展之路。     

Expectancy and frequency effects on perceptual and motor systems in choice reaction time

Three experiments investigated the effects of expectancy and stimulus frequency in character classification and identification tasks. Both expectancy and frequency were found to have effects on overall response latency, but the two factors had different patterns of interaction with two other experimental variables. The effect of visual quality was larger for low-frequency stimuli than for high-frequency stimuli, whereas the effect of quality was independent of expectancy. The effect of S-R compatibility was more strongly influenced by whether a stimulus was expected than by the frequency of the stimulus. The results suggest that expectancy and frequency have somewhat different effects on human information processing mechanisms. Expectancy allows temporary preparation for a specific S-R pair in response selection processes, but it has no effect on perceptual processes. Stimulus frequency, on the other hand, influences the efficiency of both perceptual and response selection processes. The overall effect of stimulus probability may be interpreted as having as components both expectancy and frequency effects.