Trautmann Sina Alexa, Fehr Thorsten, Herrmann Manfred
Department of Neuropsychology and Behavioral Neurobiology, Center for Cognitive Sciences, University of Bremen, Hochschulring 18, D-28359 Bremen, Germany.
Brain Res. 2009 Aug 11;1284:100-15. doi: 10.1016/j.brainres.2009.05.075. Epub 2009 Jun 6.
In social contexts, facial expressions are dynamic in nature and vary rapidly in relation to situational requirements. However, there are very few fMRI studies using dynamic emotional stimuli. The aim of this study was (1) to introduce and evaluate a new stimulus database of static and dynamic emotional facial expressions according to arousal and recognizability investigated by a rating by both participants of the present fMRI study and by an external sample of 30 healthy women, (2) to examine the neural networks involved in emotion perception of static and dynamic facial stimuli separately, and (3) to examine the impact of motion on the emotional processing of dynamic compared to static face stimuli. A total of 16 females participated in the present fMRI study performing a passive emotion perception task including static and dynamic faces of neutral, happy and disgusted expressions. Comparing dynamic stimuli to static faces indicated enhanced emotion-specific brain activation patterns in the parahippocampal gyrus (PHG) including the amygdala (AMG), fusiform gyrus (FG), superior temporal gyrus (STG), inferior frontal gyrus (IFG), and occipital and orbitofrontal cortex (OFC). These regions have been discussed to be associated with emotional memory encoding, the perception of threat, facial identity, biological motion, the mirror neuron system, an increase of emotional arousal, and reward processing, respectively. Post hoc ratings of the dynamic stimuli revealed a better recognizability in comparison to the static stimuli. In conclusion, dynamic facial expressions might provide a more appropriate approach to examine the processing of emotional face perception than static stimuli.
在社交情境中，面部表情本质上是动态的，并且会根据情境需求迅速变化。然而，使用动态情绪刺激的功能磁共振成像（fMRI）研究非常少。本研究的目的是：（1）根据本fMRI研究的参与者以及30名健康女性的外部样本通过评分调查的唤醒度和可识别性，引入并评估一个新的静态和动态情绪面部表情刺激数据库；（2）分别检查参与静态和动态面部刺激情绪感知的神经网络；（3）研究与静态面部刺激相比，运动对动态面部刺激情绪处理的影响。共有16名女性参与了本fMRI研究，她们执行了一项被动情绪感知任务，任务中包含中性、快乐和厌恶表情的静态和动态面部。将动态刺激与静态面部进行比较表明，在海马旁回（PHG）包括杏仁核（AMG）、梭状回（FG）、颞上回（STG）、额下回（IFG）以及枕叶和眶额皮质（OFC）中，出现了增强的情绪特异性脑激活模式。这些区域分别被认为与情绪记忆编码、威胁感知、面部识别、生物运动、镜像神经元系统、情绪唤醒增加以及奖赏处理有关。对动态刺激的事后评分显示，与静态刺激相比，其具有更好的可识别性。总之，与静态刺激相比，动态面部表情可能为检查情绪面部感知的处理提供一种更合适的方法。
