Distinct Attention Networks for Feature Enhancement and Suppression in Vision
Distinct Attention Networks for Feature Enhancement and Suppression in Vision
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DOI：
10.1177/0956797612440099
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发表时间：
2012-10-01
影响因子：
8.2
通讯作者：
Srinivasan, Ramesh
中科院分区：
文献类型：
--
作者：
Bridwell, David A.;Srinivasan, Ramesh
注意力使感觉加工偏向于包含行为相关事件信息的神经元。这些注意偏向显然反映了特征增强和抑制的共同影响。我们考察了视觉加工中增强和抑制的单独影响，方法是确定当闪光特征与注意位置的目标特征匹配、与这些特征竞争或中性时，对无人注意的闪光的反应是否受到调制。我们发现，抑制主要调制了在较低α频段(f(2)=8 Hz)具有首选频率的顶神经网络，而增强主要影响在较高α频段(f(2)=12 Hz)具有首选频率的顶神经网络。这些响应与感知相结合，当目标特征与闪烁特征匹配时(即，在增强期间)，对无人值守的闪烁的大响应导致随后检测到目标。我们的结果表明，增强和抑制是两个截然不同的过程，它们共同作用形成视觉感知。
Attention biases sensory processing toward neurons containing information about behaviorally relevant events. These attentional biases apparently reflect the combined influence of feature enhancement and suppression. We examined the separate influence of enhancement and suppression in visual processing by determining whether responses to an unattended flicker were modulated when the flicker features matched target features at the attended location, competed with those features, or were neutral. We found that suppression primarily modulated parietal networks with a preferred frequency in the lower alpha band (f(2) = 8 Hz), and enhancement primarily influenced parietal networks with a preferred frequency in the upper alpha band (f(2) = 12 Hz). These responses were coupled with perception, with large responses to the unattended flicker leading to subsequently detected targets when the target features matched the flicker features (i.e., during enhancement). Our results suggest that enhancement and suppression are two distinct processes that work together to shape visual perception.