PIGEONS (COLUMBA LIVIA) APPROACH NASH EQUILIBRIUM IN EXPERIMENTAL MATCHING PENNIES COMPETITIONS

The game of Matching Pennies (MP), a simplified version of the more popular Rock, Papers, Scissors, schematically represents competitions between organisms with incentives to predict each other's behavior. Optimal performance in iterated MP competitions involves the production of random choice patterns and the detection of nonrandomness in the opponent's choices. The purpose of this study was to replicate systematic deviations from optimal choice observed in humans when playing MP, and to establish whether suboptimal performance was better described by a modified linear learning model or by a more cognitively sophisticated reinforcement‐tracking model. Two pairs of pigeons played iterated MP competitions; payoffs for successful choices (e.g., “Rock” vs. “Scissors”) varied within experimental sessions and across experimental conditions, and were signaled by visual stimuli. Pigeons' behavior adjusted to payoff matrices; divergences from optimal play were analogous to those usually demonstrated by humans, except for the tendency of pigeons to persist on prior choices. Suboptimal play was well characterized by a linear learning model of the kind widely used to describe human performance. This linear learning model may thus serve as default account of competitive performance against which the imputation of cognitively sophisticated processes can be evaluated.     

影响决策的情感因素——后悔理论的研究述评

情感因素在决策中起着重要的作用。本文对决策中最重要的情感因素——后悔因素的研究发展及其成果做了归纳总结,同时也将一些零散的发现整合在一起,使之更加系统化。后悔情绪对决策的影响作用不容忽视,作为决策理论之一的后悔理论在决策理论中的重要地位日益凸显出来。未来的研究将仍旧主要集中在其对决策的影响方面。后悔理论成为理性决策的一个可替代理论,已为时不远。     

Criterion knowledge: A moderator of using the recognition heuristic?

The recognition heuristic (RH) claims that people base inferences on recognition only. This has been questioned by several studies which found that additional knowledge was influential. However, in some of these studies, participants' additional knowledge might have encompassed criterion knowledge thus rendering any inferential strategy superfluous. The present study was therefore designed to test the effect of criterion knowledge on use or non‐use of the RH. Eighty‐one participants made pair‐wise comparisons with respect to the size of Belgian cities and also provided estimates of the cities' actual size. We found that relative criterion knowledge (i.e., knowledge about the relative position of an object on the criterion dimension) did indeed play some role, but its exclusion left the main critical findings intact, nonetheless. We thus conclude that previous studies conducted in the paradigm of natural recognition should not be generally refuted by the argument of participants possessing criterion knowledge. Copyright © 2009 John Wiley & Sons, Ltd.     

下咽癌治疗的临床决策

下咽癌是一种预后较差的头颈部肿瘤。目前下咽癌治疗的临床决策还存在很多不规范和不合理的问题。运用循证医学的原则来指导和规范下咽癌治疗的临床决策,以期提高患者的治疗效果、降低医疗费用及提高生活质量。     

影响无痛分娩推广的因素分析及临床对策

分娩是生殖健康的一个重要组成部分,如何减轻分娩疼痛,倡导生殖健康是现代医学领域研究的课题之一。本文通过反映我国无痛分娩率较低的现状,分析了影响无痛分娩推广的因素,指出了无痛分娩推广的重大临床意义及社会效益,并提出有效提高无痛分娩率的临床对策。     

初中生乐观主义与其学业成绩的关系及中介效应分析

通过问卷考察了初中生乐观人格和乐观解释的关系、乐观主义与学生学业成绩的关系以及积极应对策略的中介效应,分析表明两种乐观主义存在着联系,乐观主义与学业成绩存在密切关系,不同水平的乐观对学生学业成绩产生的影响不一样,积极应对策略的中介效应不明显。结论:乐观主义是影响初中生学业成绩的一个重要影响因素,不同乐观主义对学业成绩产生的直接影响不一样,高水平的乐观是有利于学业成绩的。     

低收入女性的生活史特质与繁衍策略的关系

本研究探讨了单一性伙伴（n = 222）、两个以上性伙伴（n = 145）与无性伙伴（n = 106）三组低收入女性的长期配偶偏好、人生阅历、生活史特质与个人特征的关系。研究结果显示三组女性的配偶偏好趋于一致,繁衍策略的组别差异与人生阅历和所处环境具有较高相关,三组女性并不偏好特定类型的配偶。路径分析显示首次生育年龄直接预测配偶数量,受教育水平和初次性交时间对配偶数量与首次生育年龄之间的关系具有显著调节作用;女儿与父亲相处的时间可以预测初次性交年龄。研究结果显示父亲投资影响青少年性行为发展的时间表,人类繁衍的长期进化是性行为变化的根源     

产前筛查的几点思考

在临床工作中,患者因某些原因不能得到有效或常规的治疗,而最终选择停止继续治疗、即放弃治疗,及时、合理、正确地处理放弃治疗对患者、医务人员、家庭、社会等是极其重要的。对临床上常见的放弃治疗原因进行了全面分析,包括患方、医生、功利、无奈、道德等方面的原因,并提出了解决放弃治疗的临床决策,该研究为临床治疗过程中提供了重要的理论参考。     

难治性抑郁症成因与优化治疗的思考

抑郁症是一种高患病率、高致残率及高自杀率的严重精神疾患。在过去10年中,抗抑郁药物研究取得了突飞猛进的进展,然而,在临床上仍约有30％～50％的抑郁症患者最终成为难治性抑郁症病例。目前针对难治性抑郁症尚无较好的治疗策略。本文运用系统论方法学分析生物、心理、社会各个要素在病因中所起作用,探讨最佳治疗策略。     

非小细胞肺癌的综合诊治策略——NCCN肿瘤学临床实践指南（2006第二版）评析

肺癌目前位于世界肿瘤死亡原因的首位。肺癌的治疗应根据临床不同的分期,选择规范化的治疗方案。肺癌规范化综合治疗可使早期肺癌患者5年生存率达50%~70%左右。中晚期达到25%左右。美国NCCN肿瘤学临床实践指南在2006年发布了第二版非小细胞肺癌治疗方案,对于规范化治疗肺癌以及提高肺癌病人生存率和生存质量有着积极的意义。