THE RELATIONSHIP BETWEEN N2 AND N400 - SCALP DISTRIBUTION, STIMULUS PROBABILITY, AND TASK RELEVANCE
THE RELATIONSHIP BETWEEN N2 AND N400 - SCALP DISTRIBUTION, STIMULUS PROBABILITY, AND TASK RELEVANCE
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DOI：
10.1111/j.1469-8986.1991.tb00411.x
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发表时间：
1991-03-01
期刊：
影响因子：
3.7
通讯作者：
VAUGHAN, HG
中科院分区：
文献类型：
--
作者：
DEACON, D;BRETON, F;VAUGHAN, HG
从多个维度比较了事件相关脑电位的N2和N400分量。在一个任务中，被试根据大小进行区分，在另一个任务中，被试根据语义类别进行区分。在一组条件下，刺激很少沿着一个刺激维度（大小或语义类别）偏离，在另一组条件下，刺激很少沿着两个刺激维度（大小和语义类别）偏离。当受试者根据大小进行区分时，刺激大小的少量偏差与负面情绪相关，负面情绪在320 ms （N2）左右达到峰值。当被试根据语义类别进行区分时，刺激语义类别的不频繁偏差与负性相关，负性在400 ms左右达到峰值（N400）。N2和N400在头皮分布、半球不对称性和对刺激概率的敏感性方面基本相似。当尺寸变化与任务无关时，不产生N2；当语义范畴变化与任务无关时，不产生N400。
The N2 and N400 components of the event-related brain potential were compared along several dimensions. In one task, subjects discriminated on the basis of size, and in another task, subjects discriminated on the basis of semantic category. In one set of conditions stimuli deviated infrequently along one stimulus dimension (either in size or semantic category) and in another set of conditions stimuli deviated infrequently along two stimulus dimensions (both size and semantic category). When subjects discriminated on the basis of size, infrequent deviation in the size of the stimuli was associated with a negativity that peaked around 320 ms (N2). When subjects discriminated on the basis of semantic category, infrequent deviation in the semantic category of the stimuli was associated with a negativity that peaked around 400 ms (N400). N2 and N400 were found to be generally alike in scalp distribution, hemispheric asymmetry, and sensitivity to stimulus probability. N2 was not elicited when size changes were task irrelevant and N400 was not elicited when changes in semantic category were task irrelevant.