Gaeta G, Susac A, Supek S, Babiloni F, Vecchiato G
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:2518-21. doi: 10.1109/EMBC.2015.7318904.
The present work aims to investigate the electroencephalographic (EEG) activity elicited by the observation of emotional pictures selected from the International Affective Picture System (IAPS) database. We analyzed the evoked activity within time intervals of increasing duration taking into account the related ratings of Valence and Arousal. The scalp statistical maps of Power Spectral Density (PSD), related to pictures with high valence, revealed an enhanced activity across frontal areas in the theta band and the involvement of fronto-parietal circuits in the alpha band. Difference in the processing of low and high arousing pictures, however, seems to be highly dependent on the valence dimension: for low valenced pictures, the difference in arousal was processed immediately after the observation of the picture, while for the high-valenced ones the processing took part in the second part of the observation. These results appear to be congruent with the literature, while the novelty of the current study is represented by the comparison of the activity elicited in different time windows by both the Arousal and Valence dimensions. It is possible, in this way, to observe how the processing of one variable influences the other, creating a dynamic description of the Valence-Arousal space.
本研究旨在调查观察从国际情感图片系统（IAPS）数据库中选取的情感图片所引发的脑电图（EEG）活动。我们分析了在持续时间不断增加的时间间隔内的诱发活动，并考虑了效价和唤醒度的相关评分。与高价值图片相关的功率谱密度（PSD）头皮统计图显示，θ波段额叶区域的活动增强，α波段额顶叶回路参与其中。然而，低唤醒度和高唤醒度图片的处理差异似乎高度依赖于效价维度：对于低价值图片，唤醒度差异在观察图片后立即得到处理，而对于高价值图片，处理则发生在观察的第二部分。这些结果似乎与文献一致，而本研究的新颖之处在于比较了唤醒度和效价维度在不同时间窗口引发的活动。通过这种方式，可以观察到一个变量的处理如何影响另一个变量，从而创建效价 - 唤醒度空间的动态描述。
