积极情绪对整体和局部知觉的影响:事件相关电位研究

Effects of positive emotion on global and local processing:An event-related potentials study

目的:采用启动范式和事件相关电位方法,研究积极情绪如何调制视觉系统选择性加工刺激整体特征和局部特征的神经机制。方法:对22名大学生,采用Neuroscan公司64导脑电系统记录其在3种情绪图片启动条件下执行整体和局部加工任务时的事件相关电位(ERPs)和行为学结果。结果:250～320ms时间段内,积极情绪和中性情绪启动条件下整体加工引起的事件相关脑电波幅大于局部加工的脑电波幅(P<0.01),差异主要分布于额-中央区;350～500ms时间段内,积极情绪启动的整体加工(局部加工)诱发的事件相关脑电波幅大于消极情绪启动的整体加工(局部加工)诱发的脑电波幅(P<0.01),差异主要分布于顶-枕区。结论:积极情绪促进整体和局部知觉加工的神经机制,可能存在差别,ERP早期成分的差异可能与额-中央区活动关系密切,晚期成分与顶-枕区活动联系可能更为密切。

Objective： To measure event-related potentials （ERPs） to clarify how different emotions affect neural activity during the visual perception of global or local features. Methods： The ERP elicited by detecting global letters or local letters under three emotion conditions were recorded in 22 college students and their behavior- al performance were collected. The ERP waveforms of these two tasks under three emotion conditions were ana- lyzed. Results： Under the positive and neutral emotion priming conditions, global processing induced larger frontal- central N2 （250 -320 ms） waveforms than local processing （P 〈 0. 01）; both global and local processing induced the larger posterior P3 （350 - 500ms） waveforms under the positive emotion priming condition than under the nega- tive emotion priming （P 〈 0. 01）. Conclusion： The findings suggest that brain mechanisms of global and local pro- cessing under positive emotion condition are different.