字母Flanker任务中刺激冲突和反应冲突的神经机制  

The Neural Mechanisms of Stimulus and Response Conflicts in the Letter Flanker Task

作　　者：唐丹丹[1,2] 高雪梅 罗念 李文权 朱海[1] 杨青松[1] TANG Dan-dan;GAO Xue-mei;LUO Nian;LI Wen-quan;ZHU Hai;YANG Qing-song(School of Education and Center of Mental Health and Psychological Counseling,Zunyi Normal College,Zunyi Guizhou 563006,China;Faculty of Psychology,Southwest University,Chongqing 400715,China)

机构地区：[1]遵义师范学院教师教育学院,贵州遵义563006 [2]西南大学心理学部,重庆400715

出　　处：《西南大学学报（自然科学版）》2021年第4期146-156,共11页Journal of Southwest University(Natural Science Edition)

基　　金：遵义市科技局、遵义师范学院联合科技研发资金项目(遵市科合HZ字[2020]29号);国家自然科学基金项目(31771254).

摘　　要：在认知控制研究中,字母Flanker任务是考察刺激冲突和反应冲突产生机制的重要模型.然而,在该任务中,现有研究尚未清晰揭示这两类冲突的产生机制.该研究通过两个实验记录了被试完成2∶1字母Flanker任务时的脑电和行为数据,考察了典型Flanker任务中刺激冲突和反应冲突的特定机制.实验一和实验二的行为结果一致表明:反应时随练习而缩短,但刺激冲突和反应冲突无显著变化.实验一的事件相关电位结果显示,练习对中顶部P300波幅无显著影响,反应时与P300波幅负相关.这些结果表明,在字母Flanker任务中,练习对刺激冲突和反应冲突无显著影响.因此,该研究揭示了字母Flanker任务中刺激冲突和反应冲突的稳定特征.In the research field of cognitive control,an important model used to study the mechanisms of stimulus and response conflicts is the letter Flanker task.However,the existing research has not made clear the mechanisms of the two types of conflicts that vary with practice in this task.The present study recorded the behavioral and electroencephalographic data when healthy participants were performing the 2∶1 letter Flanker task in two experiments.The behavioral results in both experiments showed that response time(RT)was significantly reduced with practice,but constant stimulus and response conflicts had no marked changes.The event-related potential(ERP)results in Experiment 1 were consistent with the RT results,and showed that the centro-parietal P300(400-600 ms)amplitudes were stable across blocks and negatively correlated with RT,suggesting a top-down conflict resolution mechanism.Altogether,in the letter Flanker task,stimulus and response conflicts are not significantly affected by the practice.Thus,the present findings reveal a stable feature of stimulus and response conflicts in the typical Flanker task.

关 键 词：2∶1映射设计 冲突 练习 字母Flanker任务 刺激冲突 反应冲突 神经机制 

分 类 号：B845.1[哲学宗教—心理学] Q983[生物学—人类学]