Department of Cognitive Sciences, University of California, Irvine, CA, USA.
Psychol Sci. 2012 Oct 1;23(10):1151-8. doi: 10.1177/0956797612440099. Epub 2012 Aug 23.
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 (f2=8 Hz), and enhancement primarily influenced parietal networks with a preferred frequency in the upper alpha band (f2=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.
注意偏向将感官处理集中在包含与行为相关事件信息的神经元上。这些注意偏向显然反映了特征增强和抑制的综合影响。我们通过确定当闪光特征与被注视位置的目标特征匹配、与这些特征竞争或为中性时，对未被注意的闪烁的反应是否被调制，来检查视觉处理中增强和抑制的单独影响。我们发现，抑制主要调制具有下 alpha 频带（f2=8 Hz）的优先频率的顶叶网络，而增强主要影响具有上 alpha 频带（f2=12 Hz）的优先频率的顶叶网络。这些反应与感知相关，当目标特征与闪烁特征匹配时（即增强期间），对未被注意的闪烁的大反应会导致随后检测到目标。我们的结果表明，增强和抑制是两种不同的过程，它们共同作用塑造视觉感知。
