Zhuang Ning, Jiang Lin, Yan Bin, Tong Li, Shu Jun, Yang Kai, Yao Dezhong, Xu Peng, Zeng Ying
Henan Key Laboratory of Imaging and Intelligent Processing, PLA Strategy Support Force Information Engineering University, Zheng Zhou 450001, China.
The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Lab for Neuroinformation, University of Electronic Science and Technology of China, Chengdu 610054, China.
Neuroscience. 2021 May 1;461:44-56. doi: 10.1016/j.neuroscience.2021.02.012. Epub 2021 Feb 17.
Emotion plays an important role in people's lives. However, the neural mechanism of affective perception is still unclear. In this study, steady-state visual evoked potentials (SSVEPs) were used to explore information processing speed and interactions among cortical structures involved in affective perception. Pleasant, unpleasant, and neutral pictures selected from the International Affective Picture System were presented either in intact or phase-scrambled form at a fixed frequency, where the induced SSVEPs could be used as a frequency marker of brain activity with high temporal resolution and signal-to-noise ratio. Source estimation methods were used to reconstruct the cortical signals. The information processing of affective images was studied by phase and causal connection analysis in the cortical space to investigate the information processing speed of the local brain region and the dynamic interactions across brain regions. Experimental results showed that affective and semantic perception was accompanied by the acceleration of information processing speed in the ventral pathway. Unpleasant emotions had the fastest information processing speed in the ventral stream compared with pleasant and neutral emotions, including the middle occipital gyrus and the middle temporal gyrus, with a right hemisphere bias. In addition, unpleasant emotions were stronger than pleasant emotions in long-term causal connections in the bilateral middle temporal gyrus, and the direction was from the right hemisphere to the left hemisphere. These results provide unique insights into the cortical activities for affective perception and support the view that unpleasant emotions have priority in information perception in the middle temporal gyrus compared with pleasant and neutral emotions, with a right hemisphere bias.
情绪在人们的生活中起着重要作用。然而，情感感知的神经机制仍不清楚。在本研究中，稳态视觉诱发电位（SSVEPs）被用于探索情感感知中涉及的皮质结构之间的信息处理速度和相互作用。从国际情感图片系统中选取的愉快、不愉快和中性图片以完整或相位打乱的形式以固定频率呈现，其中诱发的SSVEPs可作为具有高时间分辨率和信噪比的脑活动频率标记。使用源估计方法重建皮质信号。通过皮质空间中的相位和因果连接分析研究情感图像的信息处理，以调查局部脑区的信息处理速度和跨脑区的动态相互作用。实验结果表明，情感和语义感知伴随着腹侧通路中信息处理速度的加快。与愉快和中性情绪相比，不愉快情绪在腹侧流中的信息处理速度最快，包括枕中回和颞中回，且存在右半球偏向。此外，在双侧颞中回的长期因果连接中，不愉快情绪比愉快情绪更强且方向是从右半球到左半球。这些结果为情感感知的皮质活动提供了独特的见解，并支持了这样一种观点，即与愉快和中性情绪相比，不愉快情绪在颞中回的信息感知中具有优先性，且存在右半球偏向。
