The time-course of global and local attentional guidance in Kanizsa-figure detection
The time-course of global and local attentional guidance in Kanizsa-figure detection
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DOI：
10.1016/j.neuropsychologia.2011.04.023
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发表时间：
2011-07-01
期刊：
影响因子：
2.6
通讯作者：
Mueller, Hermann J.
中科院分区：
文献类型：
--
作者：
Conci, Markus;Toellner, Thomas;Mueller, Hermann J.
对象配置可以在不同的层次级别上以感知方式表示。例如，在视觉搜索中，全局 Kanizsa 图形可以被有效地检测到，而对局部分组的搜索效率很低，在定义目标的层次级别上会出现依赖于相似性的非目标干扰（Conci、Muller 和 Elliott，2007）。本研究旨在检查这种全局-局部搜索不对称性的电生理学相关性。结果表明，层次对象级别之间的差异在多个处理阶段中都很明显：搜索全局目标（与局部目标相比）会在早期感觉成分（P1、N1）中引起更大的振幅。此外，注意力集中于目标的效率反映在后对侧负性（PCN）中，与全局目标相比，PCN 延迟显着延迟（大约 70 毫秒）。最后，后期成分（P3 和慢波-SW）反映了整体搜索效率，该效率由定义目标的层次级别和基于相似性的非目标干扰决定。总而言之，这种模式表明，对象完成的多个顺序过程有助于全局绑定对象的注意力优先于纯粹的本地元素分组。 (C) 2011 Elsevier Ltd. 保留所有权利。
Object configurations can be perceptually represented at various hierarchical levels. For example, in visual search, global Kanizsa figures are detected efficiently, whereas search for local groupings is inefficient, with similarity-dependent nontarget interference arising at the hierarchical level that defines the target (Conci, Muller, & Elliott, 2007). The present study was designed to examine the electrophysiological correlates of this global-local search asymmetry. The results revealed differences between hierarchical object levels to be evident throughout a number of processing stages: search for a global, versus a local, target elicited larger amplitudes in early sensory components (P1, N1). Moreover, the efficiency of attentional orienting towards a target was mirrored in the Posterior Contralateral Negativity (PCN), with PCN latencies being substantially delayed (by similar to 70 ms) with local, versus global, targets. Finally, late components (P3 and slow wave-SW) reflected the overall search efficiency, which was determined by both the hierarchical level at which the target was defined and the similarity-based nontarget interference. Taken together, this pattern shows that multiple, sequential processes of object completion contribute to the attentional precedence of a globally bound object over a mere local element grouping. (C) 2011 Elsevier Ltd. All rights reserved.