Understanding cooperation in the Prisoner’s Dilemma game

In the standard one-shot Prisoner’s Dilemma game, participants often choose to cooperate, when the optimal strategy is to defect. This puzzling finding has attracted considerable interest both in terms of possible computational frameworks for modeling human judgment, but also regarding the more general debate of human altruism. In this research, we ask how much of human behavior in this task can be explained by a putative bias for cooperative behavior and whether this, in turn, is influenced by personality. We compared performance on the standard task with performance on a matched neutral one; we manipulated the optimal strategy (defect or cooperate); and we manipulated the amount of payoff for responding optimally. Results revealed little evidence for a bias for cooperative behavior, but significant associations with the personality factors of Behavioural Activation System (BAS) Reward Responsivity and Agreeableness were found. These findings are discussed in terms of the attempt to explain judgment in one-shot, Prisoner’s Dilemma tasks with statistical or probabilistic models.     

Continuous priming effects on discrete response choices

When primed by backward-masked, target-like stimuli, discrete responses (e.g. button presses) to simple visual targets can be slower when prime and target match (compatible) than when they do not (incompatible). The current study investigated the nature of the stimulus–response mapping underlying this negative compatibility effect (NCE). Discrete left–right responses to arrow targets were primed with arrows oriented in one of 16 directions. Responses were either a standard button press or a 10 cm movement on a graphics tablet. Both tasks showed an identical NCE; importantly, reaction times in both tasks decreased smoothly as the angular distance between prime and target increased (i.e. as compatibility decreased), with the largest NCE evident between the extreme cases (prime-target distances of 0° and 180°). Primes exerted an effect on the required response in proportion to the amount of overlap (reflecting population vector coding). The mapping between the priming stimulus and response is continuous, not categorical.     

Testing four explanations for the better/worse-than-average effect: Single- and multi-item entities as comparison targets and referents

In six experiments, we tested four explanations for the better/worse-than-average effect (B/WTA) by manipulating the number of items comprising the target or referent of direct comparison. A single-item target tended to be rated more extremely than a single-item or a multi-item referent (Experiments 1–3). No B/WTA was obtained, however, when a multi-item target was compared with either a single- or multi-item referent (Experiments 4 and 5). A bias favoring a multi-item target was found only if cohesiveness among the items was increased through instructions (Experiment 6). The Unique-Attributes Hypothesis generally provided the best explanation the findings; the focalism explanation also demonstrated some empirical viability. The results suggest that important preferential decision-making outcomes can be affected by both the number of items and whether items are strategically manipulated to serve as targets or referents of comparison.     

简单心算中数学学习困难儿童的数字距离效应

采用事件相关电位(ERP)方法,以阿拉伯数字的简单心算为任务,考察数学学习困难儿童(MD)的数字距离效应。行为数据的结果表明:MD组没有出现数字距离效应,对照组儿童出现了数字距离效应。事件相关电位数据显示:与对照组相比,MD组N270的潜伏期更长;两组被试在N270的波幅和潜伏期上都没有表现出数字距离效应。研究结果表明:MD儿童对数量信息的空间表征存在缺陷。     

“超级女生”的公众心理效应分析

本文试图从公众心理效应的角度分析“超级女生”受如此多海内外中国观众钟爱的原因,以及“超级女生”带给个人和组织在如何利用公众心理效应上的启示。     

Effects of test sequence on anterograde and retrograde impairment of negative emotional scenes1

Abstract: The present study examined recognition for sequences of scenes depicting emotional compared with neutral events. In two experiments, participants were presented with a thematic series of 18 slides of scenes in which the content of two critical scenes in the middle of the series were either emotional (dead men's bodies) or neutral (an opera). A two‐item, forced‐choice recognition paradigm was used to test participants’ immediate memory performance of all 18 slides of scenes. In Experiment 1, anterograde and retrograde amnesic effects were observed for the emotional, but not the neutral scenes when a test sequence of scenes was used that did not match the original presentation order. In contrast, in Experiment 2 the test sequence matched the order seen during the original presentation, and both the anterograde and retrograde amnesic effects were not found. These results indicate that the reinstatement of the original event context is an important factor for the recognition of negative emotional memories.     

熟悉与陌生品牌启动效应的实验研究

本研究应用任务分离法对熟悉品牌和陌生品牌启动效应年龄特征进行研究,结果发现大学生被试外显成绩高于内隐成绩,且两者有显著差异。进而再采用二次比较法同样以大学生为被试,对熟悉品牌启动效应进行实验,结果表明:(1)学习前带符号组与不带符号组的成绩之间都有极其显著的差异,学习后带符号组与不带符号组之间也有极其显著差异;带符号与不带符号的两组学习前后的成绩均有极其显著的差异;在二次比较法的应用过程中我们发现:(2)如果学习前后的被试为同一组,则会产生“学习污染”。以陌生品牌为材料,用二次比较法在老、青、少三组被进行实验,并将三个年龄段的被试随机分成两组:学习前组(A)和学习后组(B),结果显示:(3)陌生品牌中存在着启动效应,不同年龄段的消费者外显记忆有差异,但内隐记忆没有差异。     

内隐学习在第二语言语音学习中的作用

本研究以大学生为被试,用符合德语读音规则的人造无意义单词(含4~5个音素)为刺激材料,采用强分离程序———匹配和编辑,并增设时间变量,比较了在先匹配后编辑,先编辑后匹配,只匹配,只编辑4种不同内隐、外显学习方式下被试对语音规则的掌握。结果表明,语音学习中存在内隐学习的优势效应,内隐与外显结合的学习方式最好。此外,实验证实了语音的内隐学习也存在长时效应。     

推理的再认启发模式研究

采用“高校配对比较任务”和“城市配对比较任务”检验Goldstein等2002年提出的推理的再认启发模型,结果证明:人们在相关信息不足、知识和时间都有限的情况下,采用再认启发策略进行推理的比率相当高,并且出现了“少即是多”效应。本研究还探讨了Goldstein等没有考虑的因素,结果发现:在压力作用下,人们仍然会采用再认启发策略进行推理;再认启发中被试会运用无关信息进行推理;在操作时间上也会出现“少即是多”效应。