Controlling for interstimulus perceptual variance abolishes N170 face selectivity
Controlling for interstimulus perceptual variance abolishes N170 face selectivity
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DOI：
10.1038/nn1864
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发表时间：
2007-04-01
影响因子：
25
通讯作者：
Pegna, Alan J.
中科院分区：
文献类型：
--
作者：
Thierry, Guillaume;Martin, Clara D.;Pegna, Alan J.
确定人类大脑何时以及如何区分物体类别是理解视觉认知的关键。事件相关电位（ERP）的研究已经达成共识，面部选择性地引起负波峰值170毫秒后介绍，“N170”。然而，在这样的实验中，面孔几乎总是从一个完整的前视图，而其他刺激是更多的感知变量，导致不受控制的刺激间感知方差（ISPV）。在这里，我们比较了面孔，汽车和蝴蝶引起的ERP，同时首次控制ISPV（低或高）。令人惊讶的是，N170是敏感的，而不是对象类别，但ISPV。此外，我们发现独立于ISPV的类别效应比一般报道的早70 ms。这些结果表明，早期ERP类别的影响，在视觉领域的问题，面对选择性的N170和建立ISPV作为一个关键因素，以控制在实验中依赖于多项试验平均。
Establishing when and how the human brain differentiates between object categories is key to understanding visual cognition. Event-related potential (ERP) investigations have led to the consensus that faces selectively elicit a negative wave peaking 170 ms after presentation, the 'N170'. In such experiments, however, faces are nearly always presented from a full front view, whereas other stimuli are more perceptually variable, leading to uncontrolled interstimulus perceptual variance (ISPV). Here, we compared ERPs elicited by faces, cars and butterflies while-for the first time-controlling ISPV (low or high). Surprisingly, the N170 was sensitive, not to object category, but to ISPV. In addition, we found category effects independent of ISPV 70 ms earlier than has been generally reported. These results demonstrate early ERP category effects in the visual domain, call into question the face selectivity of the N170 and establish ISPV as a critical factor to control in experiments relying on multitrial averaging.