The neural correlates of perceptual load induced attentional selection: An fMRI study
The neural correlates of perceptual load induced attentional selection: An fMRI study
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知觉负荷引起注意选择的神经相关性：一项功能磁共振成像研究。
DOI：
10.1016/j.neuroscience.2013.07.025
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发表时间：
2013-10
期刊：
影响因子：
3.3
通讯作者：
Zhou, X.
中科院分区：
文献类型：
--
作者：
Wei P.;Szameitat, A. J.;Müller, H. J.;Schubert, T.;Zhou, X.
采用功能磁共振成像（fMRI）实验，通过改变目标搜索过程中的知觉负荷来操纵注意选择，研究知觉负荷诱导注意选择的神经相关性。参与者在中央显示器中的非均匀（高负载条件）或均匀（低负载条件）定向的干扰条中搜索垂直或水平定向的条，该干扰条的两侧是左侧或右侧边缘呈现的垂直或水平条。中央显示高负荷时的搜索反应时比低负荷时长，侧翼显示与目标不一致时的搜索反应时比一致时长。更重要的是，侧翼一致性效应只在低负荷条件下表现出来，而在高负荷条件下没有表现出来，这表明目标搜索中的知觉负荷决定了任务无关侧翼是否被加工。成像分析显示一组额顶叶区域在高负荷条件下比低负荷条件下具有更高的激活。前扣带皮层（ACC）更激活的不一致比一致的审判。此外，前扣带回和双侧前扣带回对知觉负荷和侧翼一致性之间的相互作用敏感，因此，在低负荷条件下，不一致和一致条件下的激活差异显著，但在高负荷条件下不显著。这些结果是一致的主张，ACC和双边前额叶可能会施加执行控制，通过选择性地偏置处理有利于任务相关的信息，这种偏置依赖于资源，目前可供控制系统。
The neural correlates of perceptual load induced attentional selection were investigated in an functional magnetic resonance imaging (fMRI) experiment in which attentional selection was manipulated through the variation of perceptual load in target search. Participants searched for a vertically or horizontally oriented bar among heterogeneously (the high load condition) or homogeneously (the low load condition) oriented distractor bars in the central display, which was flanked by a vertical or horizontal bar presented at the left or the right periphery. The search reaction times were longer when the central display was of high load than of low load, and were longer when the flanker was incongruent than congruent with the target. Importantly, the flanker congruency effect was manifested only in the low load condition, not in the high load condition, indicating that the perceptual load in target search determined whether the task-irrelevant flanker was processed. Imaging analyses revealed a set of fronto-parietal regions having higher activations in the high than in the low load condition. Anterior cingulate cortex (ACC) was more activated for the incongruent than for the congruent trials. Moreover, ACC and bilateral anterior insula were sensitive to the interaction between perceptual load and flanker congruency such that the activation differences between the incongruent and congruent conditions were significant in the low, but not in the high load condition. These results are consistent with the claim that ACC and bilateral anterior insula may exert executive control by selectively biasing processing in favor of task-relevant information and this biasing depends on the resources currently available to the control system.
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