海洛因戒断者对金钱奖赏的反馈加工异常：来自ERP的证据

本研究采用金钱奖赏延迟任务考察了海洛因戒断者对金钱奖赏和损失的预期和反馈加工及其电生理机制。结果发现,预期阶段两组被试由不同线索诱发的P3波幅不存在显著性差异。在金钱奖赏加工的反馈阶段,海洛因戒断组由金钱收益条件诱发的RewP波幅显著小于对照组由金钱收益条件诱发的RewP波幅,而在无收益无损失条件下两组被试诱发的RewP波幅不存在显著性差异。此外,海洛因戒断组由金钱收益条件诱发的P3波幅与无收益无损失条件诱发的P3波幅不存在显著性差异,而对照组由金钱收益条件诱发的P3波幅显著大于其由无收益无损失条件诱发的P3波幅。在金钱损失加工的反馈阶段,由金钱损失和无收益无损失条件诱发的RewP波幅在两组被试之间不存在显著性差异,且两组被试由金钱损失条件诱发的P3波幅均显著大于其由无收益无损失条件诱发的P3波幅。以上结果说明海洛因戒断者的金钱奖赏反馈加工存在异常,具体表现为其对金钱奖赏的敏感性降低或对金钱奖赏的趋近动机减弱。     

奖赏刺激的脑电反应特征跨文化差异:一个ERP研究

本研究从文化--社会神经科学的角度出发,采用事件相关电位的方法来探究不同文化背景下的个体对具有进化和社会文化代表性的正性刺激—奖赏刺激的脑电反应特征是否具有差异。本研究采用the Door Task实验范式考察了26名中国人和24名高加索白人对不同反馈反应的脑电特征跨文化差异。结果显示,负性反馈条件下诱发的FRN平均波幅比正性反馈条件诱发的平均脑电波幅更负,这种正负反馈的波幅差异只在中国被试中有体现。在P3成分上,在正性反馈条件下,中国被试诱发的脑电波幅大于西方被试,负性反馈条件下,两组无显著差异。研究结果表明,相对于西方被试,中国被试对奖赏反馈刺激可能具有较高的敏感性。这说明中西方文化下的个体对正负性反馈刺激的加工的脑电反应特征存在显著的差异。     

社会价值取向对自我社会奖赏加工的影响——来自ERPs的证据

社会价值取向(Social Value Orientation, SVO)是相互依存情境下人们对自己和他人分配结果的一种稳定的社会偏好, 按SVO不同可以将个体分为“亲社会取向”和“亲自我取向”个体。已有研究表明SVO影响个体对涉及自我金钱奖赏的结果评价加工, 而它如何影响自我社会奖赏加工过程尚不明确。本研究让亲社会取向和亲自我取向被试完成涉及自我社会奖赏(包含社会接纳和自我成就感)的猜牌建议给予任务, 同时记录其加工他人对建议的反馈(接受vs.拒绝)和他人最终结果(收益vs.损失)时诱发的脑电成分。结果发现, 在建议反馈加工阶段, 相比亲自我取向个体, 亲社会取向个体在反馈相关负波(FRN)波幅(峰-峰值)和P3平均波幅上, 建议被对方接受和被对方拒绝所诱发的波幅差异均显著; 在他人最终结果加工阶段, 建议被对方拒绝后, 对于亲社会取向个体, 对方损失诱发的反馈相关负FRN波幅比对方收益诱发的波幅更负, 而对方损失诱发的P3波幅小于对方收益诱发的波幅; 对于亲自我取向个体, 对方损失与收益诱发的FRN波幅无差异, 对方损失诱发的P3波幅显著大于对方收益诱发的波幅。这些结果表明社会价值取向调节个体对自我社会奖赏的加工。     

视觉工作记忆负载对偏差干扰调控的ERP研究

采用事件相关电位技术（ERPs）,对听视跨通道不同工作记忆负载下偏差干扰效应的加工机制进行研究。当视觉线索50%时,比较有无工作记忆负载条件下偏差干扰效应,分析偏差刺激与标准刺激诱发的差异波,结果发现：（1）存在工作记忆负载和偏差干扰效应;（2）有无工作记忆负载下差异波均出现明显的N1/MMN成分、NP3和RON成分;（3）差异波中N1/MMN成分的平均波幅和潜伏期均没有差异,NP3成分的平均波幅下降;RON成分在平均波幅上没有差异,潜伏期上有工作记忆负载下显著小于无工作记忆负载。研究表明视觉工作记忆负载对偏差干扰调控过程的神经机制并不会因为无关信息与相关信息间冲突竞争增强而改变。     

听障儿童认知抑制控制的脑电特点

通过认知抑制控制的Stroop范式运用事件相关电位考察听障儿童和对照组儿童在认知抑制控制方面的行为特点以及脑内时程特点。行为结果显示：（1）两类被试在一致条件下认知抑制控制的正确率显著高于不一致条件,反应时显著快于不一致条件,表现出冲突效应;（2）组间结果显示,听障儿童的认知抑制控制正确率显著低于对照组儿童,反应时上差异不显著。脑电结果显示：（1）不一致条件在N450上的负激活显著高于一致条件,听障儿童比对照组儿童诱发了更负的N450波幅;（2）不一致条件在SP上的正激活显著高于一致条件,两类被试在SP上差异不显著。结果提示听障儿童在认知抑制控制过程中的冲突监测功能存在障碍,这是由于冲突监测过程中注意分配能力受损所致。     

注意对人体大脑听觉诱发电位晚成分的影响

本工作在尽量减少其它对注意过程可能发生影响的心理因素的实验条件下,于同一组被试同时研究了选择性注意与实验次序对人体大脑听觉诱发电位晚成份的影响。观察到:选择性注意使N_1波与P_2波潜伏期延长,波幅增高;P_3波波幅增高。先试组N_1波潜伏期延长,波幅增高;P_2、N_2、P_3波波幅增高。实验中观察到一些不符合刺激强度规律的现象。对实验结果进行了讨论。     

正性情绪刺激效价强度的变化对外倾个体注意的调制作用

大量研究证明外倾性与正性情绪相关,且已有行为和fMRI研究表明外倾个体对正性刺激存在注意偏向。研究假设外倾个体对正性情绪刺激投入更多的注意资源,且注意程度受正性刺激效价强度变化的调制。实验采用内隐情绪任务和改进后的oddball的范式,利用ERP技术高度精确的时间分辨率,在一个较短的时间窗口内考察外倾被试在三种效价条件下（极端正性刺激,中等正性刺激,中性刺激）与注意相关的P2波幅是否两两差异显著。结果表明,外倾被试组在三种条件下P2波幅两两差异显著,且极端正性刺激诱发的P2波幅最大,中等正性刺激诱发的P2波幅次之,中性刺激诱发的P2波幅最小;非外倾被试组的P2波幅在三种情况下无显著差异。研究结果从ERP的角度证明了外倾被试对正性刺激存在注意偏向,且注意程度随正性刺激效价强度的变化而变化     

成败反馈对大学生核心自我评价的影响：任务重要性、外向性的调节作用

该研究以247名大学生为被试,采用2（反馈类型：成功、失败）×2（任务重要性：重要任务、不重要任务）×2（外向性：内向、外向）组间设计探讨成败反馈对大学生核心自我评价的影响,以及任务重要性和外向性在其中的调节作用。结果表明：（1）反馈类型、任务重要性和外向性对核心自我评价变化的主效应及三者的交互作用效应均显著。（2）成败反馈与任务重要性对核心自我评价变化存在显著的交互作用;简单效应分析表明,在失败反馈条件下,执行重要任务被试核心自我评价的下降幅度显著大于执行不重要任务被试核心自我评价的下降幅度。（3）成败反馈与外向性对核心自我评价变化存在显著的交互作用;简单效应分析显示,在失败反馈条件下,外向被试核心自我评价的下降幅度显著小于内向被试。（4）在失败反馈条件下,任务重要性和外向性对核心自我评价的变化存在交互作用。     

音乐训练与抑制控制的关系：来自ERPs的证据

抑制控制是人类非常重要的认知功能之一, 它对个体适应环境具有重要的意义。本研究将抑制控制细分为反应抑制和冲突控制, 采用Go/No-go和Stroop任务从行为和脑电层面, 考察了音乐训练与抑制控制能力的关系及其认知神经机制。结果发现：在行为指标上, 音乐训练组比控制组的Stroop干扰效应更小, 但两组被试在Go/No-go任务表现上没有差异。在脑电指标上, 在Go/No-go任务中音乐训练组的N2差异波和P3差异波波幅(No-go减Go条件)显著大于控制组, 在Stroop任务中音乐训练组的N450差异波波幅(不一致减一致条件)也显著大于控制组, 但两组被试的SP差异波波幅(不一致减一致条件)无显著差异。结果表明：音乐训练组被试在反应抑制任务中可能具有更强的冲突监控和运动抑制能力, 在冲突控制任务中也具有更强的冲突监控能力。本研究从电生理的层面反映了音乐训练与抑制控制能力的提升具有一定的关联。     

显性度对隐喻加工的影响:事件相关电位研究

为探明意义显性度因素对隐喻与直义语言加工的影响,本研究采用修改后的S1－S2范式,使用ERP技术考察高、低不同显性度条件下隐喻与直义材料加工的差异。被试判断S1、S2词间的语义关联强度,记录S2词的事件相关电位。实验发现：低显性度比高显性度材料诱发更负的N400,在低显性度条件下隐喻比直义材料诱发了更负的N400;P600时间窗内低显性材料平均波幅更低,隐喻与直义平均波幅差异不显著。结果支持意义显性度假说,显性度因素影响隐喻加工,同时在隐喻加工的后期语义整合阶段,可能还有其他因素影响隐喻加工。     

When and why do we want to know? How experienced regret promotes post‐decision information search

The effect of emotional and situational factors on the decision to seek out post‐decision information about un‐chosen alternative was examined in five experiments. Experiment 1 tested participants' willingness to find out the outcome of an un‐chosen investment that was likely to have a higher value than the chosen investment. It was found that participants were more willing to acquire information when they were responsible for the decision. Experiment 2 showed that responsibility affects information seeking, in particular when one suspects that a wrong decision was made. Experiments 3–5 examined the role of regret on information seeking. It was shown that regret about making the wrong investment (Experiment 3), forgetting to send in a lottery ticket (Experiment 4), and missing an opportunity to use a discount card after spending a month in Australia (Experiment 5), mediates the information‐seeking behavior. Experiment 5 also demonstrated that the experience of regret (and not its anticipation) influences post‐decision information seeking even when the information is of no future use. Copyright © 2006 John Wiley & Sons, Ltd.     

决策中后悔的ERP研究

采用运气轮博弈范式探讨后悔的加工时程。分析决策正误的ERPs发现,200～300ms决策错误比正确诱发更为负走向的波,表现为典型的FRN（feedback-related negativity, FRN）;300～400ms决策正确比错误诱发更大的P300。500～900ms决策正确比错误诱发更大的LPC（late positive component, LPC）,并表现出明显的右半球优势效应。上述结果支持了FRN加工反馈刺激显著性信息和P300加工反馈刺激效价的观点,研究发现后悔与LPC可能具有密切关联。将来研究须在控制得失程度基础上,考察FRN、P300和LPC与效价、得失及得失程度和情绪体验的关系。     

The role of anticipated regret in escalation of commitment

This research tests the general proposition that people are motivated to reduce future regret under escalation situations. This is supported by the findings that (a) escalation of commitment is stronger when the possibility of future regret about withdrawal is high than when this possibility is low (Studies 1a and 1b) and (b) escalation of commitment increases as the net anticipated regret about withdrawal increases (Studies 2a and 2b). Furthermore, the regret effects in the 4 studies were above and beyond the personal responsibility effects on escalation. This research indicates that people in escalation situations are simultaneously influenced by the emotions they expect to experience in the future (e.g., anticipated regret) and by events that have happened in the past (e.g., responsibility for the initiating previous decision).     

作为效应的ERP研究

晚正成分能够反映不同效价和不同唤醒度的情绪。作为后悔的一种现象,作为效应是否与晚正成分具有关联是研究关心的问题。采用运气轮博弈的范式,记录与分析被试在“做”与“不做”决策下的ERPs。研究发现,决策结果的正误显著影响了FRN、P300和LPC的波幅大小。作为类别对FRN、P300和LPC波幅的影响受到不同决策结果的影响,在决策正确的条件下,作为类别对FRN、P300和LPC波幅不产生影响,而在决策错误的条件下,作为类别对FRN、P300和LPC波幅产生了显著的影响。结果表明作为效应不仅影响了FRN、P300的波幅,同时也影响了LPC的波幅,将来研究应进一步探明晚正成分与后悔的密切关联。     

Social feedback interferes with implicit rule learning: Evidence from event-related brain potentials

The human brain can learn contingencies built into stimulus sequences unconsciously. The quality of such implicit learning has been connected to stimulus social relevance, but results so far are inconsistent. We engaged participants in an implicit-intentional learning task in which they learned to discriminate between legal and illegal card triads on the sole basis of feedback provided within a staircase procedure. Half of the participants received feedback from pictures of faces with a happy or sad expression (social group) and the other half based on traffic light icons (symbolic group). We hypothesised that feedback from faces would have a greater impact on learning than that from traffic lights. Although performance during learning did not differ between groups, the feedback error-related negativity (fERN) was delayed by ~20 ms for social relative to symbolic feedback, and the P3b modulation elicited by infrequent legal card triads within a stream of illegal ones during the test phase was significantly larger in the symbolic than the social feedback group. Furthermore, the P3b mean amplitude recorded at test negatively correlated with the latency of the fERN recorded during learning. These results counterintuitively suggest that, relative to symbolic feedback, socially salient feedback interferes with implicit learning.     

Decision making and the P300 component of the cortical evoked response

The amplitude of P300, and of other components of the evoked potentials, was examined during a task which required Ss to make a response appropriate to the conjoint properties of two rapidly successive visual patterns. In one set of conditions, the task was structured such that both stimuli were needed for the choice judgment. In another set of conditions, the task was changed from choice to simple RT by presenting the patterns in a predictable order. It was observed that P300 was enhanced during the choice RT conditions and that this enhancement was present only for the P300 following the stimulus permitting the choice and not the other, relevant but not decisive, stimulus appearing in close temporal proximity. An appreciable degree of independence between P300 and other components was indicated by the appearance of P300 under conditions in which other evoked potential components were entirely refractory. The data support an account for P300 in terms of poststimulus processes, such as decision making, and not in terms of preparatory adjustments.     

Understanding and predicting parental decisions about early childhood immunizations.

This research investigated the factors that influence decisions about immunizations. Women in the third trimester of pregnancy (N=195) rated their likelihood of immunizing their child; stated their reasons for and against immunizing; and rated their perceptions of the benefits and risks of immunization, feelings of responsibility, and anticipated regret if harm occurred. Immunization status was determined at follow-up. Stepwise regression analyses demonstrated that immunization decisions are strongly influenced by omission bias factors such as anticipated responsibility and regret variance (which explained more than 50% of variance). It is suggested that parents may benefit from antenatal decision aids that address omission bias and encourage them to assess benefits and risks of immunizations on the basis of scientific evidence.     

Perpetrators' Freedom of Choice as a Determinant of Responsibility Attribution

Abstract

In the present study, a swindler had high versus low freedom of choice while deciding to commit a crime. He actually swindled Polish university students (involved observers) out of a large versus a small amount of money (high vs. low loss). Other students (noninvolved observers) were informed about the swindler's action. All students suggested the punishment that they believed the swindler deserved (the punishments chosen were used as an index of responsibility attribution). Involved students assigned more severe punishments than noninvolved students did. In the high-loss condition, involved observers were more punitive than they were in the low-loss condition. The judgments of the swindler's victims were determined by the magnitude of their loss; they ignored information about the swindler's freedom of choice. In contrast, the responsibility attributed by the noninvolved observers was influenced by the swindler's freedom of choice, but only in the low-loss condition. Noninvolved observers informed that the swindler had high freedom of choice were insensitive to information about the magnitude of the consequences for the victim.     

Memory with and without awareness: performance and electrophysiological evidence of savings.

Event-related potentials (ERPs) recorded on the scalp were shown to be sensitive indicators of the strength of a memory trace on both implicit and explicit tests of memory. In explicit recognition tests, the amplitude of a positive potential identified as P300 was larger for "old" than for "new" words regardless of whether the subject categorized the items correctly. This effect, however, was statistically reliable only when the recognition memory (d') was relatively high. In contrast to ERPs, the reaction times in explicit recognition were sensitive to accuracy but not to repetition. In implicit tests, lexical decisions to repeated words were faster than to newly presented words. The magnitude of the repetition effect varied neither with elapsed time since the last repetition nor with the number of previous repetitions. In contrast, the P300 elicited by the same words were sensitive to both lag and recency of repetition, suggesting that they were influenced by the episodic memory strength of the items.     

Reconsidering the Relation between Regret and Responsibility

Recently Connolly, Ordóñez, and Coughlan challenged the view that regret is partly determined by perceived responsibility for the regretted outcome [Connolly, T. Ordóñez, L. D., & Coughlan, R. (1997). Regret and responsibility in the evaluation of decision outcomes.Organizational Behavior and Human Decision Processes, 70, 73–85]. In a series of experiments they manipulated whether actors arrived at an outcome through their own decision or through a “computer assignment” over which they had no influence. This decision agency manipulation did not affect their “regret measure.” We show in two experiments that this null-effect is due to the fact that regret was measured by means of a general happiness assessment. In the present research we replicated the basic design of their experiments and also found no effects of decision agency on the happiness assessment. However, the results showed the predicted effects of decision agency when regret was directly measured. Moreover, a measure of disappointment seemed to indicate the opposite effect: People are more disappointed when a negative outcome is caused by a computer assignment than when caused by their own choice. The role of regret and disappointment in decision making is discussed.