Feature-selective attention enhances color signals in early visual areas of the human brain
Feature-selective attention enhances color signals in early visual areas of the human brain
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DOI：
10.1073/pnas.0606668103
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发表时间：
2006-09-19
影响因子：
11.1
通讯作者：
Hillyard, S. A.
中科院分区：
文献类型：
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作者：
Mueller, M. M.;Andersen, S.;Hillyard, S. A.
使用选择性刺激处理（稳态视觉诱发电位，SSVEP）的电生理措施，以调查特定功能的注意颜色线索。受试者观看由空间上混合的红色和蓝色点组成的显示器，这些点不断随机移动位置。红点和蓝点以不同的频率闪烁，从而在视觉皮层中引起可区分的SSVEP信号。选择性地关注红点或蓝点群体产生了其频率标记的SSVEP的增强幅度，该幅度通过源建模定位到视觉皮层的早期水平。控制实验表明，这种选择是基于颜色，而不是闪烁频率线索。这种信号放大出席的颜色项目提供了一个经验基础，在视觉搜索过程中的快速识别功能连接，提出了“引导搜索”模型。
used an electrophysiological measure of selective stimulus processing (the steady-state visual evoked potential, SSVEP) to investigate feature-specific attention to color cues. Subjects viewed a display consisting of spatially intermingled red and blue dots that continually shifted their positions at random. The red and blue dots flickered at different frequencies and thereby elicited distinguishable SSVEP signals in the visual cortex. Paying attention selectively to either the red or blue dot population produced an enhanced amplitude of its frequency-tagged SSVEP, which was localized by source modeling to early levels of the visual cortex. A control experiment showed that this selection was based on color rather than flicker frequency cues. This signal amplification of attended color items provides an empirical basis for the rapid identification of feature conjunctions during visual search, as proposed by "guided search" models.