The visual N1 component as an index of a discrimination process
The visual N1 component as an index of a discrimination process
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DOI：
10.1111/1469-8986.3720190
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发表时间：
2000-03-01
期刊：
影响因子：
3.7
通讯作者：
Luck, SJ
中科院分区：
文献类型：
--
作者：
Vogel, EK;Luck, SJ
许多先前的研究表明，视觉N1成分是较大的关注位置刺激比无人关注的位置刺激。这种差异通常只观察到毛皮任务涉及的关注位置刺激的歧视，这表明N1波反映了歧视过程中，适用于关注的位置。本研究测试了这一假设，通过检查N1组件引起的出席刺激的条件下，无论是需要或不需要受试者进行歧视。具体来说，N1引起的中央凹刺激在选择反应时间（RT）的任务与N1引起的相同的刺激在简单的RT任务。在三个实验中，在选择RT任务中观察到比简单RT任务更大的后验N1。即使当消除了几个潜在的混淆（例如，唤醒和运动准备）。即使在不需要运动反应的情况下，也可以观察到这种N1辨别效应，并且这种效应存在于基于颜色和形状的辨别中。此外，这种歧视效应是同样大的容易和困难的歧视，反对一个简单的资源为基础的解释目前的结果。相反，本研究的结果是一致的假设，即视觉N1成分反映了一个歧视过程中的注意焦点的运作。
Many previous studies have demonstrated that the visual N1 component is larger for attended-location stimuli than for unattended-location stimuli. This difference is observed typically only fur tasks involving a discrimination of the attended-location stimuli, suggesting that the N1 wave reflects a discrimination process that is applied to the attended location. The present study tested this hypothesis by examining the N1 component elicited by attended stimuli under conditions that either required or did nor require the subject to perform a discrimination. Specifically, the N1 elicited by foveal stimuli during choice-reaction time (RT) tasks was compared with the N1 elicited by identical stimuli during simple-RT tasks. In three experiments, a larger posterior N1 was observed in choice-RT tasks than in simple-RT tasks. even when several potential confounds were eliminated (e.g., arousal and motor preparation). This N1 discrimination effect was observed even when no motor response was required and was present for both color- and form-based discriminations. Moreover, this discrimination effect was equally large for easy and difficult discriminations, arguing against a simple resource-based explanation of the present results. instead, the results of this study are consistent with the hypothesis that the visual N1 component reflects the operation of a discrimination process within the focus of attention.