Gianotti Lorena R R, Faber Pascal L, Schuler Matthias, Pascual-Marqui Roberto D, Kochi Kieko, Lehmann Dietrich
The KEY Institute for Brain-Mind Research, University Hospital of Psychiatry, University of Zurich, Lenggstrasse 31, 8032, Zurich, Switzerland.
Brain Topogr. 2008 Spring;20(3):143-56. doi: 10.1007/s10548-007-0041-2. Epub 2008 Jan 4.
The temporal dynamics of the neural activity that implements the dimensions valence and arousal during processing of emotional stimuli were studied in two multi-channel ERP experiments that used visually presented emotional words (experiment 1) and emotional pictures (experiment 2) as stimulus material. Thirty-two healthy subjects participated (mean age 26.8 +/- 6.4 years, 24 women). The stimuli in both experiments were selected on the basis of verbal reports in such a way that we were able to map the temporal dynamics of one dimension while controlling for the other one. Words (pictures) were centrally presented for 450 (600) ms with interstimulus intervals of 1,550 (1,400) ms. ERP microstate analysis of the entire epochs of stimulus presentations parsed the data into sequential steps of information processing. The results revealed that in several microstates of both experiments, processing of pleasant and unpleasant valence (experiment 1, microstate #3: 118-162 ms, #6: 218-238 ms, #7: 238-266 ms, #8: 266-294 ms; experiment 2, microstate #5: 142-178 ms, #6: 178-226 ms, #7: 226-246 ms, #9: 262-302 ms, #10: 302-330 ms) as well as of low and high arousal (experiment 1, microstate #8: 266-294 ms, #9: 294-346 ms; experiment 2, microstate #10: 302-330 ms, #15: 562-600 ms) involved different neural assemblies. The results revealed also that in both experiments, information about valence was extracted before information about arousal. The last microstate of valence extraction was identical with the first microstate of arousal extraction.
在两项多通道事件相关电位（ERP）实验中，研究了在处理情绪刺激过程中实现效价和唤醒维度的神经活动的时间动态。这两项实验分别使用视觉呈现的情绪词（实验1）和情绪图片（实验2）作为刺激材料。32名健康受试者参与实验（平均年龄26.8±6.4岁，24名女性）。两项实验中的刺激都是根据言语报告进行选择的，以便我们能够在控制另一个维度的同时，描绘出一个维度的时间动态。单词（图片）在中央呈现450（600）毫秒，刺激间隔为1550（1400）毫秒。对刺激呈现的整个时段进行ERP微状态分析，将数据解析为信息处理的连续步骤。结果显示，在两项实验的几个微状态中，愉快和不愉快效价的处理（实验1，微状态#3：118 - 162毫秒，#6：218 - 238毫秒，#7：238 - 266毫秒，#8：266 - 294毫秒；实验2，微状态#5：142 - 178毫秒，#6：178 - 226毫秒，#7：226 - 2y6毫秒，#9：262 - 302毫秒，#10：302 - 330毫秒）以及低唤醒和高唤醒的处理（实验1，微状态#8：266 - 294毫秒，#9：294 - 346毫秒；实验2，微状态#10：302 - 330毫秒，#15：562 - 600毫秒）涉及不同的神经集合。结果还显示，在两项实验中，关于效价的信息在关于唤醒的信息之前被提取。效价提取的最后一个微状态与唤醒提取的第一个微状态相同。
