Carretié L, Iglesias J
Departamento de Psicología Biológica y de la Salud, Universidad Autónoma de Madrid, Ciudad Universitaria de Cantoblanco, Spain.
Int J Psychophysiol. 1995 Apr;19(3):183-92. doi: 10.1016/0167-8760(95)00004-c.
Facial expression processing specificity was investigated by means of event-related potentials (ERPs). Stimuli consisted on happiness facial expressions (H) along with three other visual stimuli with different physical and affective characteristics: neutral facial expressions, landscapes and grey slides. The 32 subjects had to rate the stimuli with respect to two affective dimensions: 'valence' and 'arousal'. EEG was recorded at T7, T8, Fz and Cz, and the epoch was of 1000 ms (100 ms prior to stimulus onset). Analyses revealed that the variability of N200 and P200 components, which were not able to detect a differential activity in response to H stimuli, could be explained in terms of physical complexity and relevance of the stimuli. N300 did detect a differentiation between H and the rest of stimuli, sharing some characteristics of previous and later components. With respect to late components, P300 seemed to reflect the trends of 'arousal' ratings and SW results suggest that its amplitude was influenced by the stimulus recognition effort. Not a clear right or left hemisphere advantage in facial expression processing was found. These ERP results suggest that the specificity of facial expression processing is not strictly circumscribed to a particular latency or to a specific neural area, but it resides in a particular combination of discrete processes.
通过事件相关电位（ERP）研究面部表情加工特异性。刺激包括快乐面部表情（H）以及其他三种具有不同物理和情感特征的视觉刺激：中性面部表情、风景和灰色幻灯片。32名受试者必须根据两个情感维度对刺激进行评分：“效价”和“唤醒度”。在T7、T8、Fz和Cz记录脑电图，时程为1000毫秒（刺激开始前100毫秒）。分析表明，N200和P200成分的变异性无法检测到对H刺激的差异活动，这可以根据刺激的物理复杂性和相关性来解释。N300确实检测到了H与其他刺激之间的差异，具有先前和后续成分的一些特征。关于晚期成分，P300似乎反映了“唤醒度”评分的趋势，而慢波（SW）结果表明其振幅受刺激识别努力的影响。在面部表情加工中未发现明显的右半球或左半球优势。这些ERP结果表明，面部表情加工的特异性并不严格局限于特定的潜伏期或特定的神经区域，而是存在于离散过程的特定组合中。
