Missed losses loom larger than missed gains: Electrodermal reactivity to decision choices and outcomes in a gambling task

Loss aversion is a defining characteristic of prospect theory, whereby responses are stronger to losses than to equivalently sized gains (Kahneman & Tversky Econometrica, 47, 263–291, 1979). By monitoring electrodermal activity (EDA) during a gambling task, in this study we examined physiological activity during risky decisions, as well as to both obtained (e.g., gains and losses) and counterfactual (e.g., narrowly missed gains and losses) outcomes. During the bet selection phase, EDA increased linearly with bet size, highlighting the role of somatic signals in decision-making under uncertainty in a task without any learning requirement. Outcome-related EDA scaled with the magnitudes of monetary wins and losses, and losses had a stronger impact on EDA than did equivalently sized wins. Narrowly missed wins (i.e., near-wins) and narrowly missed losses (i.e., near-losses) also evoked EDA responses, and the change of EDA as a function of the size of the missed outcome was modestly greater for near-losses than for near-wins, suggesting that near-losses have more impact on subjective value than do near-wins. Across individuals, the slope for choice-related EDA (as a function of bet size) correlated with the slope for outcome-related EDA as a function of both the obtained and counterfactual outcome magnitudes, and these correlations were stronger for loss and near-loss conditions than for win and near-win conditions. Taken together, these asymmetrical EDA patterns to objective wins and losses, as well as to near-wins and near-losses, provide a psychophysiological instantiation of the value function curve in prospect theory, which is steeper in the negative than in the positive domain.     

萨班对摩诃衍遗教的批判

David Seyfort Reugg说,摩诃衍在吐蕃僧诤中失败的记录系萨迦班智达伪造的。其实,萨班在这个事件上的说法之所以成为一种权威,并不在于基本事实上的出新,而在于他的论述有力。他较早站在因明的立场来分析双方的"见地"与"修行",立意既高,便影响深远。萨班对摩诃衍和大手印的批判,我们不应该仅仅评判其是非,而应关注他的出发点,即他所面对的藏传佛教的因缘。他的体系完整、次第井然的教言不仅满足了藏族社会的需要,而且一度成为大元帝国用来维系各个民族的精神纽带,是中华民族宝贵的精神遗产。     

Hoarding in obsessive-compulsive disorder: results from the OCD Collaborative Genetics Study

Hoarding behavior occurs frequently in obsessive-compulsive disorder (OCD). Results from previous studies suggest that individuals with OCD who have hoarding symptoms are clinically different than non-hoarders and may represent a distinct clinical group. In the present study, we compared 235 hoarding to 389 non-hoarding participants, all of whom had OCD, collected in the course of the OCD Collaborative Genetics Study. We found that, compared to non-hoarding individuals, hoarders were more likely to have symmetry obsessions and repeating, counting, and ordering compulsions; poorer insight; more severe illness; difficulty initiating or completing tasks; and indecision. Hoarders had a greater prevalence of social phobia and generalized anxiety disorder. Hoarders also had a greater prevalence of obsessive-compulsive and dependent personality disorders. Five personality traits were independently associated with hoarding: miserliness, preoccupation with details, difficulty making decisions, odd behavior or appearance, and magical thinking. Hoarding and indecision were more prevalent in the relatives of hoarding than of non-hoarding probands. Hoarding in relatives was associated with indecision in probands, independently of proband hoarding status. The findings suggest that hoarding behavior may help differentiate a distinct clinical subgroup of people with OCD and may aggregate in some OCD families. Indecision may be a risk factor for hoarding in these families.     

知觉信息先期呈现下两可图的命名和相似判断

在实物图片或轮廓图先期呈现的条件下研究了6岁、9岁、12岁及成人被试对两可图形的命名或相似判断。结果表明：（1）命名项目或相似判断与线索项目有关时,各年龄被试对判断项的命名或相似判断均表现出与线索项目一致的倾向。（2）轮廓图作为线索项目时．命名或相似判断反应时较长;实物作为线索项目时,命名或相似判断反应时较短。无关项目作为为线索项目时．被试命名或相似判断的反应时居中;命名项目或相似判断项目均与线索项目一致时反应时较短;命名项目或相似判断项目均与线索项目不一致时反应时延长。（3）被试命名或相似判断的反应时随其年龄的增长而下降,6岁和9岁儿童的反应时较长;12岁儿童的反应时较短;成人的反应时最短。     

神经心理学手段及其在行为遗传学研究中的应用

神经心理学的检测手段包括神经心理学测验和仪器检查。行为遗传学是一门在多学科基础上发展形成的的交叉学科。近年来,应用神经心理学手段进行行为遗传学研究,已经取得了一些可喜的进展。     

中国青少年心理健康素质·认知风格的研究

应用《青少年心理健康素质调查表·认知风格分量表》对全国23个不同省市地区的44063名青少年进行了调查,对不同年级阶段青少年认知风格的发展特点进行了分析。结果发现：（1）我国青少年认知风格的发展是常态的;（2）我国青少年认知风格的发展具有比较明显的阶段性,随着年级的升高其得分出现了“高—低—高”的变化趋势。     

图形的相似性与差异性判断的关系及机制的研究

本研究采用与标准刺激特征相似和关系相似的图形组成的图片,让80名大学生被试选择与标准刺激更相似的和差异更大的图形,分析相似性和差异性判断的关系以及两种判断过程的机制。结果发现：相似性判断和差异性判断不是镜像关系;差异性判断的时间长于相似性判断的时间;在特征与关系共存的时候,特征和关系在相似性判断和差异性判断中起着不同的作用,相似性判断更多地考虑关系,差异性判断更多地考虑特征。     

4～6岁幼儿相似性判断与类别判断的知识效应

采用类别知识的分类学习模式,选取72名4-6岁幼儿作为被试,对相似性判断和类别判断的知识效应进行实验研究。结果表明：（1）相似性判断和类别判断存在知识效应。（2）相似性判断的知识效应存在显著的年龄差异,类别判断的知识效应不存在显著的年龄差异;5岁是知识学习对幼儿相似性判断产生影响的关键时期。（3）相似性判断知识效应的性别差异不显著,类别判断知识效应的性别差异极其显著,男孩更倾向于依据学习概念所强调的属性进行类别判断。     

社会转型时期大学生的价值优先性

本研究以Schwartz开发的价值观量表(SVS)为工具,以北京地区1077位大学生为被试,运用结构方程模型、方差分析等方法考察社会变迁背景下大学生价值观的内容和结构。研究结果发现(1)大学生价值观由4类高阶价值和10类基本价值构成,在总体结构上不存在性别差异。(2)大学生的价值优先性呈现出三个基本特征:价值取向多元、利益指向多元、现实性。鉴于对研究局限的认识,本研究亦对后续研究方向提出建议。