Concurrent schedules of positive and negative reinforcement: differential-impact and differential-outcomes hypotheses

Considerable evidence from outside of operant psychology suggests that aversive events exert greater influence over behavior than equal-sized positive-reinforcement events. Operant theory is largely moot on this point, and most operant research is uninformative because of a scaling problem that prevents aversive events and those based on positive reinforcement from being directly compared. In the present investigation, humans' mouse-click responses were maintained on similarly structured, concurrent schedules of positive (money gain) and negative (avoidance of money loss) reinforcement. Because gains and losses were of equal magnitude, according to the analytical conventions of the generalized matching law, bias (log b (double dagger) 0) would indicate differential impact by one type of consequence; however, no systematic bias was observed. Further research is needed to reconcile this outcome with apparently robust findings in other literatures of superior behavior control by aversive events. In an incidental finding, the linear function relating log behavior ratio and log reinforcement ratio was steeper for concurrent negative and positive reinforcement than for control conditions involving concurrent positive reinforcement. This may represent the first empirical confirmation of a free-operant differential-outcomes effect predicted by contingency-discriminability theories of choice.     

FINDING AND FOSTERING THE PHILOSOPHICAL IMPULSE IN YOUNG PEOPLE: A TRIBUTE TO THE WORK OF GARETH B. MATTHEWS

Abstract: This article highlights Gareth Matthews's contributions to the field of philosophy for young children, noting especially the inventiveness of his style of engagement with children and his confidence in children's ability to analyze perplexing issues, from cosmology to death and dying. I relate here my experiences in introducing philosophical topics to adolescents, to show how Matthews's work can be successfully extended to older students, and I recommend taking philosophy outside the university as a way to foster critical thinking in young students and to improve the public status of the profession.     

Effects of personality and threat of evaluation on divergent and convergent thinking

This study explores the effects of the Big Five personality traits and threat of evaluation on divergent and convergent thinking in a sample of 82 UK students. Results showed that Openness and Extraversion predicted divergent thinking under both threat of evaluation and no evaluation, whilst Neuroticism correlated significantly with divergent thinking (negatively) only under threat of evaluation. However, mediational analysis showed that the effects of Neuroticism on divergent thinking under threat of evaluation were fully accounted for by Extraversion. Thus neurotics’ divergent thinking was significantly more impaired because they were more introverted. Theoretical and practical implications are discussed.     

情绪冲突控制过程的脑电特征研究

应用Flanker研究范式探讨了正常成人被试在情绪冲突控制过程中的脑电特征.结果发现:干扰刺激的特征主要在P200上得到体现,判断刺激的特征主要在N300上得到体现,干扰刺激与判断刺激的特征体现了个体注意控制的过程.积极情绪和消极情绪在判断过程中发挥着不同的作用,但无论是作为干扰刺激还是作为判断刺激,消极情绪都使任务难度增大,对加工过程造成干扰;积极情绪则不然.     

思维风格对中美大学生课堂学习行为的影响研究

对长期以来具有争议的中美学生存在课堂学习行为差异的现象,研究者推测中美学生由于具有思维风格的差异,造成他们对课堂内容的处理方式的区别,从而影响他们不同的课堂行为反应。研究对来自于中国学生、中国留美学生和美国学生三组样本的数据进行分析。结果表明在控制了文化组别和学习动机因素后,思维风格仍能显著预测课堂学习行为,并能部分地解释中美学生之间存在的课堂学习行为差异。     

注意和非注意条件下的整体和局部性质加工

以往关于整体和局部知觉的研究通常要求被试直接对出现在复合刺激整体或局部水平上的靶目标做反应,因此复合刺激与任务相关并被注意。该研究通过测量复合字母的整体和局部性质对随后出现的探测刺激的启动效应来研究在非注意条件下整体和局部性质加工的差异。实验一发现复合刺激的整体和局部性质对探测刺激产生负启动效应,但二者没有显著差异。实验二缩短了启动刺激与探测刺激之间的时间间隔,复合刺激的整体和局部性质对探测刺激都不再产生启动效应。在实验一、二中,当要求被试直接对复合刺激做反应时,其分辨局部性质的错误率都比分辨整体性质的错误率高。根据这些结果,讨论了在注意和非注意下的整体和局部性质加工的差异。     

小学低年级儿童的等值分数概念发展及干预

等值分数概念的发展要以相对量概念和乘法思维为基础。实验1将小学一至三年级儿童等值分数概念的发展划分为3个阶段：整体量概念、数量化的相对量概念、正式的等值分数概念, 结果表明一年级儿童尚未获得数量化的相对量概念, 二年级儿童尚未发展起成熟的乘法思维。基于此, 依据最近发展区原理设计了干预实验。实验2的干预方法是在一年级儿童的整体量概念基础上促进其数量化的相对量概念的发展, 实验3的干预方法是通过熟悉的任务情境来促进二年级儿童对乘法关系的实际意义的理解, 从而促进其乘法思维的发展。这些干预方法达到了预期效果, 为开展等值分数的早期教学提供了借鉴。     

条件性的关联学习和消退过程的性别差异

采用事件相关电位技术和条件性关联学习模型相结合的方法, 考察在负性背景下男女性对一般事件的关联学习和消退是否存在差异。结果表明：在关联学习阶段, 男性较女性表现出P2潜伏期缩短和N2波幅增大, 而女性比男性表现出更大的P3波幅。在消退阶段, 女性较男性出现更小的P2波幅和更大的P3/LPP波幅。这说明女性可能慢于男性探索到条件刺激和非条件刺激之间的关联, 并且保持时间更久; 男性在相对早期对消退产生更大的反应, 女性则在相对晚期对消退投入更多的资源及努力。     

负性偏向的神经机制

负性偏向是指负性信息比其他信息得到优先的注意和加工。在负性偏向中注意偏向既是一种自动化的过程也是一种受控制的过程, 杏仁核和眶额皮层在这过程中起着重要作用, 杏仁核调节早期的自动化注意偏向而眶额皮层则控制着自上而下的注意偏向; 负性记忆偏向不仅表现在负性信息得到更深的编码, 还表现在负性信息的再认标准降低。未来应开展负性偏向的皮层?皮层连接、基因、负性偏向的拓展以及负性偏向的干预研究。     

个人自立与自我图式、他人图式

根据前期系列研究的结果提出了高个人自立者的自我图式、他人图式均比低个人自立者积极的假设, 从外显和内隐两个方面分别设计实验对个人自立高分组和低分组各30名大学生进行了研究, 以检验该假设。研究1采用形容词4级评定任务, 结果发现：①在反应时指标上, 高、低个人自立组的差异不显著; ②在评价等级指标上, 个人自立高分组对积极词的评价等级显著高于低分组, 对消极词的评价等级边缘显著的低于低分组。研究2采用外来情绪Simon任务(extrinsic affective Simon task, EAST), 结果发现：①在反应时指标上, 在过去自我和将来自我条件下, 高、低个人自立组的EAST分数没有显著差异, 在现在自我条件下, 个人自立高分组的EAST分数显著高于低分组; 在过去、现在和将来他人条件下, 个人自立高分组的EAST分数均显著高于低分组。②在错误率指标上, 高、低个人自立组的差异不显著。总的来看, 两个子研究的结果均支持了研究假设。