Event-related brain potentials distinguish processing stages involved in face perception and recognition
Event-related brain potentials distinguish processing stages involved in face perception and recognition
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DOI：
10.1016/s1388-2457(99)00285-0
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发表时间：
2000-04-01
影响因子：
4.7
通讯作者：
Eimer, M
中科院分区：
文献类型：
--
作者：
Eimer, M
目的：研究事件相关脑电位(ERP)如何反映面孔识别的不同加工阶段，以及刺激重复和注意设置对这种影响的影响。在第一部分中，被试必须检测不经常出现的目标(手)，在第二部分中，注意力要么指向图片刺激，要么远离图片刺激。结果：面孔特异性N170成分在外侧颞叶电极处被最大限度地诱发，不受面孔熟悉度的影响。与陌生面孔相比，熟悉面孔会在300到500毫秒(‘N400f’)之间引发更强的负性，然后是一个。过去刺激(‘P600f’)超过500毫秒的正性增强。与“经典的”N400不同的是，这些效应是顶端中心分布的。对于重复呈现熟悉的面孔，它们被减弱了，但仍然可靠。当注意力被引导到另一项高难度任务时，没有引起‘N400f’，但我们的‘P600f’效应仍然存在。结论：虽然N170反映了面孔的前范畴结构编码，但‘N400f’和‘P600f’可能指示了面孔识别的后续加工。结构编码受损可能导致人脸识别中断。一个神经心理学的案例研究说明了这一点，该研究表明，面孔失认症患者的面部识别缺乏N170和后来的ERP指标。(C)2000爱思唯尔爱尔兰科学有限公司。保留所有权利。
Objectives: An event-related brain potential (ERP) study investigated how different processing stages involved in face identification are reflected by ERP modulations, and how stimulus repetitions and attentional set influence such effects.Methods: ERPs were recorded in response to photographs of familiar faces, unfamiliar faces, and houses. In Part I, participants had to detect infrequently presented targets (hands), in Part II, attention was either directed towards or away from the pictorial stimuli.Results: The face-specific N170 component elicited maximally at lateral temporal electrodes was not affected by Face familiarity. When compared with unfamiliar faces, familiar faces elicited an enhanced negativity between 300 and 500 ms ('N400f') which was followed by an. enhanced positivity beyond 500 ms past-stimulus ('P600f'). In contrast to the 'classical' N400, these effects were parietocentrally distributed. They were attenuated, but still reliable, for repeated presentations of familiar faces. When attention was directed to another demanding task, no 'N400f' was elicited, but We 'P600f' effect remained to be present.Conclusions: While the N170 reflects the pre-categorical structural encoding of faces, the 'N400f' and 'P600f' are likely to indicate subsequent processes involved in face recognition. Impaired structural encoding can result in the disruption of face identification. This if; illustrated by a neuropsychological case study, demonstrating the absence of the N170 and later ERP indicators of face recognition in a prosopagnosic patient. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.