SPATIAL-FILTERING DURING VISUAL-SEARCH - EVIDENCE FROM HUMAN ELECTROPHYSIOLOGY
SPATIAL-FILTERING DURING VISUAL-SEARCH - EVIDENCE FROM HUMAN ELECTROPHYSIOLOGY
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DOI：
10.1037/0096-1523.20.5.1000
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发表时间：
1994-10-01
影响因子：
2.1
通讯作者：
HILLYARD, SA
中科院分区：
文献类型：
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作者：
LUCK, SJ;HILLYARD, SA
通过抑制来自周围干扰物的竞争信息，可以提高视觉搜索阵列中目标的识别能力。本研究提供的证据表明，这种假设的滤波过程具有神经关联，即事件相关电位波形的“N2pc”分量。当目标项被竞争的干扰项包围时，可以观察到N2pc，但当该阵列可以根据简单的特征信息被拒绝为非目标时，N2pc不存在。此外，当通过删除干扰项、使干扰项相关或使数组中的所有项相同来阻止过滤时，N2pc被消除。结合先前的地形分析，这些结果表明，在对刺激阵列进行初步的基于特征的分析后，注意过滤发生在枕骨皮层，受到来自高层皮质区域的反馈的控制。
The identification of targets in visual search arrays may be improved by suppressing competing information from the surrounding distractor items. The present study provided evidence that this hypothetical filtering process has a neural correlate, the ''N2pc'' component of the event-related potential waveform. The N2pc was observed when a target item was surrounded by competing distractor items but was absent when the array could be rejected as a nontarget on the basis of simple feature information. In addition, the N2pc was eliminated when filtering was discouraged by removing the distractor items, making the distractors relevant, or making all items within an array identical. Combined with previous topographic analyses, these results suggest that attentional filtering occurs in occipital cortex under the control of feedback from higher cortical regions after a preliminary feature-based analysis of the stimulus array.