Temporal dynamics of face repetition suppression
Temporal dynamics of face repetition suppression
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DOI：
10.1016/j.brainresbull.2006.06.002
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发表时间：
2006-10-16
影响因子：
3.8
通讯作者：
Ungerleider, Leslie G.
中科院分区：
文献类型：
--
作者：
Ishai, Alumit;Bikle, Philip C.;Ungerleider, Leslie G.
单单位记录和功能性脑成像研究表明，视觉皮层对重复刺激的神经反应减少。使用脑磁图，我们比较了由重复的中性面孔引起的反应，由恐惧的面孔，这是任务相关（目标）或不相关（干扰）。面孔在纹外皮层诱发了双相反应，在160-185 ms和220-250 ms达到峰值，在较早的时间间隔对中性面孔的反应更强，在较晚的时间间隔对恐惧面孔的反应更强。在这两个潜伏期，重复中性和恐惧的目标导致降低幅度的MEG信号。此外，我们还发现，目标呈现的背景影响了他们的处理：恐惧的干扰增加了中性和恐惧的目标引起的反应。我们的数据表明，效价增强和上下文的影响，可以检测到在250毫秒内的纹外视皮层，这些过程可能反映了其他地区的反馈。(c)2006年爱思唯尔公司All rights reserved.
Single-unit recordings and functional brain imaging studies have shown reduced neural responses to repeated stimuli in the visual cortex. Using MEG, we compared responses evoked by repetitions of neutral faces to those evoked by fearful faces, which were either task relevant (targets) or irrelevant (distracters). Faces evoked a bi-phasic response in extrastriate cortex, peaking at 160-185 ms and at 220-250 ms, with stronger responses to neutral faces at the earlier interval and stronger responses to fearful faces at the later interval. At both latencies, repetitions of neutral and fearful targets resulted in reduced amplitude of the MEG signal. Additionally, we found that the context in which targets were presented affected their processing: fearful distracters increased the responses evoked by both neutral and fearful targets. Our data indicate that valence enhancement and context effects can be detected in extrastriate visual cortex within 250 ms and that these processes likely reflect feedback from other regions. (c) 2006 Elsevier Inc. All rights reserved.