中文摘要：

使用事件相关电位（event-related potentials,ERPs）技术考察场景（scene）的不同空间频率信息对面部表情加工的影响。结果发现：对于完整频谱的正常场景来说,中性场景中的恐惧面孔所诱发的N170波幅显著大于消极场景中的恐惧面孔,但该场景效应并未出现在高、低空间频率场景中;另外,中性场景中的中性面孔所诱发的N170波幅显著大于消极场景中的中性面孔,该效应发生于三类不同空间频率的场景中。该研究结果表明,场景对恐惧面孔早期知觉编码加工的影响依赖于场景完整频谱信息。相对于恐惧面孔,中性情绪面孔的结构化编码加工更容易受到消极情绪场景的干扰,而且这种干扰能够发生在场景仅有粗略轮廓信息以及细节线条信息的情况下。

英文摘要：

Facial expressions are fundamental emotional stimuli as they convey important information in social interaction. Most empirical research on facial expression processing has focused on isolated faces. But in everyday life, faces are embedded in surrounding context. For example, fearful faces always accompany with tight bodies, and happy faces appear in birthday parties more often than in sickrooms. Scenes which faces are embedded in provide typical visual context. Recently some studies attempted to investigate the influence of emotional scenes on facial expression processing. Although a few previous studies in this field demonstrated the scene effects of facial expression processing existed, the studies did not further explore the specific processing mechanism of the scene effects. Because of its excellent temporal resolution, the present study used event-related potentials （ERPs） to investigate the effects of scenes that contain different spatial frequencies on facial expression processing. Our hypothesis was that the different spatial frequencies of scenes affected facial expression processing in different ways. Eighteen right-handed college students （11 females; age range 17-24 years; mean age_20.67±1.91 years） were paid to participate in the experiment. Thirty-two face pictures （16 females and 16 males） with fearful and neutral expressions and thirty-two scene pictures （16 negative scenes and 16 neutral scenes） were presented. Spatial frequency content in the original scene stimuli （broad-band, BSF） was filtered using a high-pass cut-off that was 〉 16cpi for the higher spatial frequency （HSF） scene stimuli, and a low-pass cut-off of 〈 8cpi for the lower spatial frequency （LSF） scene stimuli. In the present study, we used a paradigm in which the scene and the facial expression were presented together, i.e., simultaneous processing of the scene and the facial expression. In simultaneous processing of the scene and the facial expression, the early mental representation of the sce