视觉搜索
心理学
独生子女
N2pc
负效应
认知心理学
背景(考古学)
突出
沟通
认知
神经科学
视觉注意
人工智能
计算机科学
遗传学
生物
古生物学
怀孕
作者
Brandi Lee Drisdelle,Martin Eimer
摘要
Abstract The hypothesis that salient distractors in visual search are actively suppressed is supported by the fact that these objects elicit P D components believed to be associated with inhibition. This account was challenged by researchers who found that a P D to lateral color singleton distractors was followed by a contralateral negativity, which they interpreted as an N2pc indicative of attentional capture. As this would be at odds with successful distractor suppression, they proposed an alternative lateral‐first serial scanning hypothesis, which assumes that the P D might actually be an N2pc elicited when a lateral context item is selected. We tested this hypothesis by measuring lateralized ERP components to search displays with two lateral and two vertical midline items, including a color singleton and a shape‐defined target. Color singletons triggered P D components not only in blocks where attention was unfocused because target location was unpredictable, but critically also in blocks where targets only appeared on the midline and participants had no reason to attend to lateral items. This is inconsistent with the serial scanning hypothesis and supports the idea that the P D reflects signal suppression. P D components to singleton distractors were followed by a contralateral negativity, which we interpreted as a second P D elicited by nonsalient distractors on the opposite side. Our sequential inhibition account reconciles conflicting results of recent studies and emphasizes the role of inhibitory processes during attentional target selection in visual search.
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