冲突适应的神经振荡机制  

Neural Oscillation Mechanisms of Conflict Adaptation

作　　者：唐丹丹[1] 陈安涛[1,2] 

机构地区：[1]西南大学心理学院、 认知与人格教育部重点实验室, 重庆 400715 [2]辽宁师范大学心理学院,大连116029

出　　处：《中国科学：生命科学》2013年第11期992-1002,共11页Scientia Sinica(Vitae)

基　　金：国家自然科学基金(批准号:31170980,81271477);全国优秀博士学位论文作者专项资金(批准号:201107);教育部新世纪优秀人才支持计划(批准号:NCET-11-0698);中央高校基本科研业务费专项资金(批准号:SWU1009001)资助

摘　　要：靶刺激和干扰刺激的不一致性会造成人类的行为冲突.特别地,连续的冲突情境能诱发大脑对冲突的适应.然而,目前的研究结果还不能清楚地阐释冲突适应的认知和神经机制.为了考察冲突适应的神经振荡过程,采用冲突观察实验范式,记录了15个健康成人被试在完成字母Flanker任务时的行为和脑电数据.对EEG数据进行时频分析,结果揭示了冲突适应的神经振荡机制.在观察任务中,对于不一致条件,α频带（9~13 Hz,480~980 ms）在左前额叶和中前区展现了显著的事件相关异步性（ERD）;对于一致条件,α频带在这些区域展现了显著的事件相关同步性（ERS）.在反应任务中,θ频带（6~8 Hz,50~1000 ms）的ERS在左前额叶和中前区表现为iI〈cI,反映了冲突适应.这些结果表明,冲突能诱发特定频带范围内大脑能量的调整,从而使大脑对冲突进行有效的控制.The incongruence between the target and the distractor stimuli will trigger human behavioral conflicts. Specially, thesequential conflict contexts can induce an adaptation to the conflict in the human brain. However, the cognitive andneural mechanisms of conflict adaptation are not clear in the existing studies. To investigate the neural oscillationcourses of conflict adaptation, we adopted a conflict observation task and recorded the behavioral andelectroencephalographic （EEG） data from 15 healthy human subjects when they were performing the letter Flankertask. For the EEG data, time-frequency analysis showed the neural oscillation mechanisms of conflict adaptation. Inthe observation task, the alpha-band （9-3 Hz, 480-980 ms） event-related desynchronization （ERD） in the left- andcentro-frontal regions was observed in the incongruent condition; however, the alpha-band event-relatedsynchronization （ERS） in these regions was observed in the congruent condition. In the response task, the magnitudeof theta-band （6-8 Hz, 50-1000 ms） ERS in the left- and centro-frontal regions was significantly stronger in cIcondition than that in iI condition, which reflected conflict adaptation. The results indicate that the conflict caninduce the modulations of magnitudes within special frequency ranges, which makes the brain implement the controlof conflict more effectively.

关 键 词：冲突适应 冲突观察 脑电 时频分析 Flanker任务 

分 类 号：B845[哲学宗教—心理学]