Sandwich masking eliminates both visual awareness of faces and face-specific brain activity through a feedforward mechanism.
Sandwich masking eliminates both visual awareness of faces and face-specific brain activity through a feedforward mechanism.
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夹心掩盖可以通过进餐机制消除面部的视觉意识和面部特定的大脑活动。
DOI：
10.1167/11.7.3
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发表时间：
2011-06-07
影响因子：
1.8
通讯作者：
Woldorff MG
中科院分区：
文献类型：
--
作者：
Harris JA;Wu CT;Woldorff MG
人们普遍认为，相当数量的视觉刺激的低级感觉处理可以在没有意识的情况下发生。另一方面，在没有意识的情况下，高级视觉处理的程度还不清楚。在这里，事件相关电位（ERP）的大脑活动的措施记录在一个掩蔽范式，一种常用的方法，用于衰减有意识的视觉刺激内容的意识。特别是，本研究使用了ERP激活对比的组合来跟踪早期感觉处理ERP组件和面部特定的N170 ERP激活，在试验中与无意识。电生理测量结果显示，三明治掩蔽消除了早期的面部特异性N170神经反应（在刺激后约170 ms开始），这一效应消除了对面部刺激的意识消除。此外，然而，掩蔽似乎呈现出较早的前馈视觉感官处理信号的强烈衰减。这种早期衰减可能导致信息不足被馈送到特定于对象类别处理的更高级别的视觉系统路径，从而导致对视觉对象内容的不了解。这些结果支持耦合的视觉意识和面部处理的神经指标，同时也证明了早期低层次的机制，干扰三明治掩蔽。
It is generally agreed that considerable amounts of low-level sensory processing of visual stimuli can occur without conscious awareness. On the other hand, the degree of higher-level visual processing that occurs in the absence of awareness is as yet unclear. Here, event-related potential (ERP) measures of brain activity were recorded during a sandwich-masking paradigm, a commonly used approach for attenuating conscious awareness of visual stimulus content. In particular, the present study used a combination of ERP activation contrasts to track both early sensory-processing ERP components and face-specific N170 ERP activations, in trials with versus without awareness. The electrophysiological measures revealed that the sandwich masking abolished the early face-specific N170 neural response (onset at ~170 ms post-stimulus), an effect that paralleled the abolition of awareness of face stimuli. Furthermore, however, the masking appeared to render a strong attenuation of earlier feed-forward visual sensory-processing signals. This early attenuation presumably resulted in insufficient information being fed into the higher level visual system pathways specific to object category processing, thus leading to unawareness of the visual object content. These results support a coupling of visual awareness and neural indices of face processing, while also demonstrating an early low-level mechanism of interference in sandwich masking.
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影响因子：
3.2
作者：
Fahrenfort, J. J.;Scholte, H. S.;Lamme, V. A. F.
通讯作者：
Lamme, V. A. F.
DOI：
10.1093/cercor/bhn048
发表时间：
2009-01
期刊：
Cerebral cortex (New York, N.Y. : 1991)
影响因子：
--
作者：
Kouider S;Eger E;Dolan R;Henson RN
通讯作者：
Henson RN
影响因子：
5.7
作者：
Henson, R. N.;Mouchlianitis, E.;Matthews, W. J.;Kouider, S.
通讯作者：
Kouider, S.
影响因子：
5.7
作者：
Andrews, TJ;Schluppeck, D
通讯作者：
Schluppeck, D
影响因子：
5.7
作者：
Hung, Yuwen;Smith, Mary Lou;Taylor, Margot J.
通讯作者：
Taylor, Margot J.