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首页> 外文OA文献 >Independent processing of visual stimulus changes in ventral and dorsal stream features indexed by an early positive difference in event-related brain potentials
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Independent processing of visual stimulus changes in ventral and dorsal stream features indexed by an early positive difference in event-related brain potentials

机译：独立处理视觉刺激的腹侧和背侧流特征的变化，该变化以与事件相关的脑电势的早期正差异为指标

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In event-related brain potential (ERP) studies of brain activity using a visual S1–S2 matching task, change stimuli elicit a posterior positive component with a latency of 100–200 ms. To elucidate the hierarchical organization of the processing of a visual stimulus change based on multiple stimulus features, ERPs were recorded in 12 participants performing an S1–S2 matching task with stimuli defined by color (mediated by the ventral stream) and motion direction (mediated by the dorsal stream). Each trial consisted of two sequentially presented stimuli (S1–S2), where S2 was either (1) the same as S1 (i.e., no change), (2) different from S1 in color only (color change), (3) different in motion direction only (motion direction change), or (4) different in both color and motion direction (color-motion direction change). These trials were presented in random order with equal probability, and the participants were asked to respond to one of these trials in separate blocks. Relative to the no-change stimulus, the three types of change stimuli elicited posterior positivities. The scalp-topography of change positivities differed according to the feature changed. In addition, the amplitude and scalp-topography of change positivities in response to a conjunction change were the respective sums of those in response to changes in the corresponding single features. These results suggest that the change detection system reflected by the change positivity is separate for each feature dimension, and these operate independently.
机译：在使用视觉S1-S2匹配任务进行的与大脑活动有关的事件相关脑电势（ERP）研究中，改变刺激会引起后部阳性成分，潜伏期为100-200 ms。为了阐明基于多种刺激特征的视觉刺激变化处理的层次结构，记录了12名参与者执行S1-S2匹配任务的ERPs，这些任务的刺激由颜色（由腹侧流介导）和运动方向（由腹侧流介导）定义。背流）。每个试验均由两个顺序出现的刺激（S1-S2）组成，其中S2（1）与S1相同（即不变），（2）仅与S1颜色不同（颜色变化），（3）不同仅在运动方向上（运动方向改变），或（4）在颜色和运动方向上都不同（颜色运动方向改变）。这些试验以相等的概率以随机顺序进行展示，并要求参与者在单独的区域中对其中一项试验做出回应。相对于无变化刺激，这三种类型的变化刺激引起后阳性。变化特征的头皮形貌根据变化的特征而不同。另外，响应于合取变化的变化阳性的幅度和头皮形貌分别是响应于相应的单个特征的变化的幅度和头皮形貌。这些结果表明，由变化阳性反映的变化检测系统对于每个特征维都是独立的，并且它们独立运行。

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