Caharel Stéphanie, Poiroux Stéphane, Bernard Christian, Thibaut Florence, Lalonde Robert, Rebai Mohamed
Université de Rouen, Faculté des Sciences, Labo PSY.CO EA-1780, 76821 Mont-Saint-Aignan, France.
Int J Neurosci. 2002 Dec;112(12):1499-512. doi: 10.1080/00207450290158368.
Event-related potentials (ERPs) triggered by three different faces (unfamiliar, famous, and the subject's own) were analyzed during passive viewing. A familiarity effect was defined as a significant difference between the two familiar faces as opposed to the unfamiliar face. A degree of familiarity effect was defined as a significant difference between all three conditions. The results show a familiarity effect 170 ms after stimulus onset (N170), with larger amplitudes seen for both familiar faces. Conversely, a degree of familiarity effect arose approximately 250 ms after stimulus onset (P2) in the form of progressively smaller amplitudes as a function of familiarity (subject's face < famous face < unfamiliar). These results demonstrate that the structural encoding of faces, as reflected by N170 activities, can be modulated by familiarity and that facial representations acquire specific properties as a result of experience. Moreover, these results confirm the hypothesis that N170 is sensitive to face versus, object discriminations and to the discrimination among faces.
在被动观看期间，分析了由三种不同面孔（不熟悉的、著名的和受试者自己的面孔）引发的事件相关电位（ERP）。熟悉度效应被定义为两种熟悉面孔与不熟悉面孔之间的显著差异。熟悉度程度效应被定义为所有三种条件之间的显著差异。结果显示，刺激开始后170毫秒出现熟悉度效应（N170），两种熟悉面孔的振幅更大。相反，熟悉度程度效应在刺激开始后约250毫秒出现（P2），表现为振幅随着熟悉度增加而逐渐减小（受试者自己的面孔<著名面孔<不熟悉面孔）。这些结果表明，N170活动所反映的面孔结构编码可受熟悉度调节，并且面部表征会因经验而获得特定属性。此外，这些结果证实了以下假设：N170对面孔与物体的辨别以及面孔之间的辨别敏感。
