Differential electrocortical responses to increasing intensities of fearful and happy emotional expressions
Differential electrocortical responses to increasing intensities of fearful and happy emotional expressions
复制标题
DOI：
10.1016/j.brainres.2007.06.060
复制
发表时间：
2007-08-29
期刊：
影响因子：
2.9
通讯作者：
Hietanen, Jari K.
中科院分区：
文献类型：
--
作者：
Leppanen, Jukka M.;Kauppinen, Pasi;Hietanen, Jari K.
以往的研究表明，差异事件相关电位（ERP）的恐惧和快乐/中性的面部表情。为了研究这些ERP差异背后的大脑系统是否对恐惧和快乐的强度敏感，当观察者将低强度（50%），原型（100%）和漫画（150%）的恐惧和快乐的面部表情分类时，测量了行为识别准确性和反应时间以及ERP。情绪分类的速度和准确性随着表达强度的增加而提高，并且100%和150%的表达始终被分类为预期情绪的表达。100%和150%表达的ERP比较显示，在刺激后190-290 ms，枕-颞电极上100%和150%恐惧表达的ERP的差异模式（高强度恐惧表达的ERP活动负移）。在100%和150%的快乐表情中没有观察到类似的ERP差异，排除了对高强度恐惧的ERP反映了对表达强度增加本身的反应的可能性。总之，这些结果表明，通过后部电极对恐惧面部表情的差异性皮层电反应是由神经系统产生的，该神经系统对消极而非积极的情绪表达的强度做出反应。(c)2007 Elsevier B. V.保留所有权利。
Previous studies have shown differential event-related potentials (ERPs) to fearful and happy/neutral facial expressions. To investigate whether the brain systems underlying these ERP differences are sensitive to the intensity of fear and happiness, behavioral recognition accuracy and reaction times as well as ERPs were measured while observers categorized low-intensity (50%), prototypical (100%), and caricatured (150%) fearful and happy facial expressions. The speed and accuracy of emotion categorization improved with increasing levels of expression intensity, and 100% and 150% expressions were consistently classified as expressions of the intended emotions. Comparison of ERPs to 100% and 150% expressions revealed a differential pattern of ERPs to 100% and 150% fear expressions over occipital-temporal electrodes 190-290 ms post-stimulus (a negative shift in ERP activity for high-intensity fearful expressions). Similar ERP differences were not observed for 100% and 150% happy expressions, ruling out the possibility that the ERPs to high-intensity fear reflected a response to increased expression intensity per se. Together, these results suggest that differential electrocortical responses to fearful facial expressions over posterior electrodes are generated by a neural system that responds to the intensity of negative but not positive emotional expressions. (c) 2007 Elsevier B.V. All rights reserved.