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首页> 外文期刊>Journal of psychophysiology >The Posterior Contralateral Negativity as a Temporal Indicator of Visuo-Spatial Processing
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The Posterior Contralateral Negativity as a Temporal Indicator of Visuo-Spatial Processing

机译：后对侧负性作为视觉空间处理的时间指标。

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The temporal segmentation of the processing stream between stimulus and response is a declared aim of many EEG-studies on cognitive processing. This goal, however, can only be reached when measures of high temporal sensitivity are available that are unequivocally assigned to a particular cognitive process. The present study evaluates the peak latency of the posterior contralateral negativity (PCN) as a temporal measure of visual spatial processing. In three experiments, we show systematic variability of the PCN latency with task demands. In visual search, PCN latency varied in the same direction as response times with the number of distractors. These effects, however, were smaller than the effects observed on response times, indicating that the process underlying the PCN might contribute to but did not determine response time effects. In contrast, in attentional cueing tasks and a stimulus localization task, where stimulus detection was the primarily addressed process, PCN latency varied to the same amount as manual response times. Thus, it is suggested that the latency of the PCN provides a reliable and valid temporal measure of target localization.
机译：刺激和反应之间的处理流的时间分段是许多关于认知处理的脑电图研究的明确目标。但是，只有在明确地分配给特定认知过程的高时间敏感性度量可用时，才能实现此目标。本研究评估后侧对侧负性（PCN）的峰值潜伏期作为视觉空间处理的时间度量。在三个实验中，我们显示了PCN延迟随任务需求的系统变化。在视觉搜索中，PCN延迟在与响应时间相同的方向上随分散器的数量而变化。但是，这些影响小于在响应时间上观察到的影响，这表明PCN背后的过程可能有助于但未确定响应时间的影响。相反，在注意力提示任务和刺激定位任务中，刺激检测是主要解决的过程，PCN延迟的变化幅度与手动响应时间相同。因此，建议PCN的等待时间提供了目标定位的可靠且有效的时间度量。

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