Suppression of Salient Objects Prevents Distraction in Visual Search
Suppression of Salient Objects Prevents Distraction in Visual Search
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DOI：
10.1523/jneurosci.4161-13.2014
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发表时间：
2014-04-16
影响因子：
5.3
通讯作者：
McDonald, John J.
中科院分区：
文献类型：
--
作者：
Gaspar, John M.;McDonald, John J.
为了在杂乱且不断变化的视觉环境中找到感兴趣的对象，人类必须经常忽略当前与手头任务无关的显著刺激。最近的神经影像学结果表明，防止显着性驱动的分心的能力取决于当前水平的注意力控制活动在额叶皮层，但这种控制活动防止显着性驱动的分心的具体机制仍然知之甚少。在这里，我们问是否显着性驱动的分心是通过抑制显着的干扰或优先增加相关的视觉尺寸的权重来防止。我们发现，显着的干扰被抑制，即使当他们居住在相同的功能尺寸作为目标（即，当维度加权不是一个可行的选择策略）。我们对抑制的神经生理学测量--事件相关电位的P-D成分--与执行搜索任务所需时间的变化有关：在快速反应试验中，分心物触发了P-D，但在慢反应试验中，它们触发了与工作记忆表征相关的活动。这些结果表明，在搜索过程中，显着性驱动的分心是减轻抑制机制，减少潜在的分散注意力的视觉对象的显着性。
To find objects of interest in a cluttered and continually changing visual environment, humans must often ignore salient stimuli that are not currently relevant to the task at hand. Recent neuroimaging results indicate that the ability to prevent salience-driven distraction depends on the current level of attentional control activity in frontal cortex, but the specific mechanism by which this control activity prevents salience-driven distraction is still poorly understood. Here, we asked whether salience-driven distraction is prevented by suppressing salient distractors or by preferentially up-weighting the relevant visual dimension. We found that salient distractors were suppressed even when they resided in the same feature dimension as the target (that is, when dimensional weighting was not a viable selection strategy). Our neurophysiological measure of suppression-the P-D component of the event-related potential-was associated with variations in the amount of time it took to perform the search task: distractors triggered the P-D on fast-response trials, but on slow-response trials they triggered activity associated with working memory representation instead. These results demonstrate that during search salience-driven distraction is mitigated by a suppressive mechanism that reduces the salience of potentially distracting visual objects.