Cortical evidence for negative search templates
Cortical evidence for negative search templates
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DOI：
10.1080/13506285.2017.1339755
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发表时间：
2017-01-01
期刊：
影响因子：
2
通讯作者：
Pollmann, Stefan
中科院分区：
文献类型：
--
作者：
Reeder, Reshanne R.;Olivers, Christian N. L.;Pollmann, Stefan
一个“目标模板”，指定目标功能，被认为是有益的视觉搜索性能。建立一个“负模板”，指定干扰物的功能，应提高干扰物抑制，也有利于目标检测。在目前的fMRI研究中，受试者被要求在彩色圆圈中的干扰物中寻找目标。在搜索之前，出现了三种颜色线索中的一种：一种是积极的线索，表明目标将以相同的颜色出现;一种是消极的线索，表明只有干扰物才会以相同的颜色出现;或者一种是中性的线索，表明相同的颜色不会出现在搜索显示中。功能磁共振成像结果显示，下调神经加工的大部分视觉皮层以下的负面相比，积极的线索。我们进一步发现，与积极和消极线索相比，中性线索在SPL/楔前叶中具有普遍的注意抑制机制。这些结果表明，目标模板，负模板，和任务无关的干扰抑制之间的皮层区别。
A "target template", specifying target features, is thought to benefit visual search performance. Setting up a "negative template", specifying distractor features, should improve distractor inhibition and also benefit target detection. In the current fMRI study, subjects were required to search for a target among distractors enclosed in coloured circles. Before search, one of three colour cues appeared: a positive cue indicating the target will appear in the same colour, a negative cue indicating only distractors will appear in the same colour, or a neutral cue indicating that the same colour will not appear in the search display. fMRI results revealed down-regulation of neural processing in large parts of visual cortex following negative compared to positive cues. We further found a general attention inhibition mechanism in SPL/precuneus for neutral cues compared to positive and negative cues. These results suggest a cortical distinction between target templates, negative templates, and task-irrelevant distractor inhibition.