Körner Christof, Braunstein Verena, Stangl Matthias, Schlögl Alois, Neuper Christa, Ischebeck Anja
Department of Psychology, University of Graz, Graz, Austria.
Psychophysiology. 2014 Apr;51(4):385-95. doi: 10.1111/psyp.12062. Epub 2014 Feb 11.
To search for a target in a complex environment is an everyday behavior that ends with finding the target. When we search for two identical targets, however, we must continue the search after finding the first target and memorize its location. We used fixation-related potentials to investigate the neural correlates of different stages of the search, that is, before and after finding the first target. Having found the first target influenced subsequent distractor processing. Compared to distractor fixations before the first target fixation, a negative shift was observed for three subsequent distractor fixations. These results suggest that processing a target in continued search modulates the brain's response, either transiently by reflecting temporary working memory processes or permanently by reflecting working memory retention.
在复杂环境中寻找目标是一种以找到目标而告终的日常行为。然而，当我们寻找两个相同的目标时，在找到第一个目标后必须继续搜索并记住其位置。我们使用与注视相关的电位来研究搜索不同阶段的神经关联，即找到第一个目标之前和之后。找到第一个目标会影响随后对干扰项的处理。与第一个目标注视之前的干扰项注视相比，随后的三个干扰项注视出现了负向偏移。这些结果表明，在持续搜索中处理目标会调节大脑的反应，要么通过反映临时工作记忆过程而短暂地调节，要么通过反映工作记忆保持而永久地调节。
