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首页> 美国卫生研究院文献>other >The Perception of Dynamic and Static Facial Expressions of Happiness and Disgust Investigated by ERPs and fMRI Constrained Source Analysis
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The Perception of Dynamic and Static Facial Expressions of Happiness and Disgust Investigated by ERPs and fMRI Constrained Source Analysis

机译：ERP和fMRI约束源分析研究的幸福和厌恶的动态和静态面部表情的感知

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A recent functional magnetic resonance imaging (fMRI) study by our group demonstrated that dynamic emotional faces are more accurately recognized and evoked more widespread patterns of hemodynamic brain responses than static emotional faces. Based on this experimental design, the present study aimed at investigating the spatio-temporal processing of static and dynamic emotional facial expressions in 19 healthy women by means of multi-channel electroencephalography (EEG), event-related potentials (ERP) and fMRI-constrained regional source analyses. ERP analysis showed an increased amplitude of the LPP (late posterior positivity) over centro-parietal regions for static facial expressions of disgust compared to neutral faces. In addition, the LPP was more widespread and temporally prolonged for dynamic compared to static faces of disgust and happiness. fMRI constrained source analysis on static emotional face stimuli indicated the spatio-temporal modulation of predominantly posterior regional brain activation related to the visual processing stream for both emotional valences when compared to the neutral condition in the fusiform gyrus. The spatio-temporal processing of dynamic stimuli yielded enhanced source activity for emotional compared to neutral conditions in temporal (e.g., fusiform gyrus), and frontal regions (e.g., ventromedial prefrontal cortex, medial and inferior frontal cortex) in early and again in later time windows. The present data support the view that dynamic facial displays trigger more information reflected in complex neural networks, in particular because of their changing features potentially triggering sustained activation related to a continuing evaluation of those faces. A combined fMRI and EEG approach thus provides an advanced insight to the spatio-temporal characteristics of emotional face processing, by also revealing additional neural generators, not identifiable by the only use of an fMRI approach.
机译：我们小组最近进行的功能性磁共振成像（fMRI）研究表明，与静态情绪面孔相比，动态情绪面孔可以更准确地识别并诱发更广泛的血液动力学大脑反应模式。基于此实验设计，本研究旨在通过多通道脑电图（EEG），事件相关电位（ERP）和fMRI约束研究19名健康女性的静态和动态情感面部表情的时空处理。区域来源分析。 ERP分析显示，与中性面孔相比，对于静态面部表情厌恶，LPP（后期后阳）在中心顶叶区域的振幅增加。此外，与静态的厌恶和幸福面孔相比，LPP在动态方面更为广泛并且在时间上有所延长。 fMRI对静态情绪面部刺激的源分析表明，与梭形回中的中性条件相比，与视觉处理流相关的主要后部区域大脑激活的时空调制与两种情感价有关。与时空（例如梭状回）和额叶区域（例如腹膜前额叶皮层，内侧和下额叶皮层）的中性条件相比，动态刺激的时空处理产生了增强的情绪源活动。视窗。当前数据支持这样的观点，即动态面部显示会触发更多反映在复杂神经网络中的信息，特别是因为其变化的特征可能触发与持续评估这些面孔有关的持续激活。因此，通过结合使用fMRI和EEG方法，还可以揭示仅通过使用fMRI方法无法识别的其他神经生成器，从而可以洞悉情感面部处理的时空特性，从而获得更深入的了解。

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