冲突观察所诱发的冲突适应:ERP研究

Conflict Adaptation is Induced by the Observation of Conflict:an ERP Study

为考察冲突观察条件下冲突适应的神经机制,记录了15个正常成人被试在完成字母Flanker任务时的行为和脑电数据.行为结果显示,在反应时上,观察条件的一致性和反应条件的一致性交互作用显著.事件相关电位结果显示:在观察任务中,不一致条件的N450波幅比一致条件的波幅更负,这个差异只出现在大脑的中前区.在反应任务中,在左前额叶,持续电位的差异波波幅SP(iI-iC)显著小于SP(cI-cC),并且SP的差异波波幅SP[(cI-cC)-(iI-iC)]和反应时的冲突适应RT[(cI-cC)-(iI-iC)]呈负相关.这些结果证明,在观察任务中,N450的波幅调整反映了大脑对冲突的监测;在反应任务中,SP的波幅调整反映了冲突观察所诱发的冲突适应.

Recent research shows that the observation of conflict can induce conflict adaptation. In the present study, to examine the neural dynamics of conflict adaptation, the behavioral and electroencephalography （EEG） data were recorded from fifteen healthy human subjects when they performed a letter Flanker task within the conflict observation paradigm. Behavioral results showed a significant interaction between the congruency in the observation condition and the congruency in the response condition for response time （RT）. Event-related potentials （ERPs） results showed that in the observation condition, the mean amplitude of the N450 was more negative in the incongruent type compared with the congruent type, which was found only in the centro-frontal region; in the response condition, the amplitude difference was significantly smaller for SP（iI-ic） than for SP（cI-cC） and a significant negative correlation between the SP[（cI-cC）-（iI-iC）] and the RT[（cI-cC）_（iI-iC）l in the centro-frontal region. These results confirm that in the observation task, modulations of amplitude of N450 reflect the process of conflict detection; in the response task, modulations of amplitude of SP reflect conflict adaptation that is induced by the observation of conflict.