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|本期目录/Table of Contents|

 不同预测率的不确定决策的ERP研究

《心理学探新》[ISSN:1003-5184/CN:36-1228/B]

期数:
 2011年31卷05期
页码:
 421-427
栏目:
 认知心理学
出版日期:
 2012-09-01

文章信息/Info

Title:
 The Uncertainty Decision for Different Probability： An Event-related Potential Study
作者:
 张凤华1; 张庆林2; 胡竹菁1
 1.江西师范大学 心理学院，南昌 330022；2.西南大学 心理学院，重庆 400715
Author(s):
 Zhang Fenghua1; Zhang Qinglin2; Hu Zhujing1
 1.Psychology College，Jiangxi Normal University，Nanchang 330022； 2.Psychology College，Southwest University，Chongqing 400715
关键词:
 不确定决策; 预测; 刺激显著性假说; 扩散模型; N2
Keywords:
 uncertainty decision making; predictable; incentive-salience hypothesis; diffusion model; N2
分类号:
 B842.5
DOI:
 -
文献标识码:
 A
摘要:
 该研究采用事件相关电位技术，对不同预测率的不确定决策的加工机制进行了研究。实验条件为四种不同预测率的不确定决策任务，控制条件为确定决策任务，对两种条件下的数据进行比较，结果发现：1）反应时，随着不确定性程度的增强而逐渐增长；2）正确率，被试决策的平均正确率基本上符合数字本身的可预测率。脑电结果发现：在200～300ms的时间窗口内，不确定和确定决策任务下的预测率都诱发了一个晚期的负成分（N2），五种任务之间（随着不确定程度的降低）存在着一个梯度的变化，其中50%和62.5%之间不存在着显著差异，其它预测率之间都存在着显著差异。这些结果表明被试在不确定决策任务中会对不同预测率进行归类表征，并会对不同的不确定程度有不同的知觉。
Abstract:
 High-density event-related potentials were recorded to examine the processing mechanism of the uncertainty decision.The uncertainty decision for four different probabilities was the experimental condition and the certain decision was the control condition.The result indicated that the response time was increased with the strength of the uncertainty degree by contrasting the data of two conditions.The results showed that the mean correct percentage of the decision was accord with the percentage of prediction.The ERPs result indicated that both the uncertain decision and the certain decision elicited a later negative ERP component (N2) from 200 ms to 300 ms.There was a change in the mean amplitude among the five tasks and there was no difference between the probability of 50% and the probability of 62.5%.These results indicated the participants would make the representation of categorization when facing the uncertain decision and have the different perception to the different uncertainty degree.

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备注/Memo

备注/Memo:
 基金项目：江西省社会科学规划项目（10JY72），江西师范大学博士启动基金项目（3373）。通讯作者：张庆林，E-mail：zhangql@swu.edu.cn。
更新日期/Last Update:  2011-11-01