Sustained preferential processing of social threat cues: bias without competition?
Sustained preferential processing of social threat cues: bias without competition?
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DOI：
10.1162/jocn.2010.21566
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发表时间：
2011-08
影响因子：
3.2
通讯作者：
Keil A
中科院分区：
文献类型：
--
作者：
Wieser MJ;McTeague LM;Keil A
高情感意义的刺激，如社会威胁线索，优先在人脑中处理。然而，关于这些刺激是否会自动捕捉注意力并削弱视野中并发刺激的处理，仍有一个持续的争论。这项研究考察了高社交焦虑个体和低社交焦虑个体在两个空间分离的面部表情竞争过程中大脑皮层易化的持续波动。两个面部表情以不同的频率(14赫兹和17.5赫兹)闪烁3000毫秒，以分离竞争刺激诱发的大脑皮质信号(“频率标记”)。只有在社交焦虑程度较高的个体中，愤怒的表情与快乐和中性表情相比，才与视觉区域的大脑皮层易化有关。这一发现与各自相互竞争的刺激无关。在观看刺激的第一秒，社交焦虑参与者的大脑皮层参与度就会升高，并持续到整个陈述阶段。这些结果基于对注意资源分配的持续测量，支持这样一种观点，即高个人意义的刺激与早期和持续的优先感觉加工有关。然而，这些线索不会干扰空间上分离的同时面孔的大脑皮层处理，这表明它们在吸引注意力方面是有效的，但对资源的竞争较弱。
Stimuli of high emotional significance such as social threat cues are preferentially processed in the human brain. However, there is an ongoing debate, whether or not these stimuli capture attention automatically and weaken the processing of concurrent stimuli in the visual field. This study examined continuous fluctuations of electrocortical facilitation during competition of two spatially separated facial expressions in high and low socially anxious individuals. Two facial expressions were flickered for 3000 ms at different frequencies (14 Hz and 17.5 Hz) to separate the electrocortical signals evoked by the competing stimuli (“frequency-tagging”). Angry faces compared to happy and neutral expressions were associated with greater electrocortical facilitation over visual areas only in the high socially anxious individuals. This finding was independent of the respective competing stimulus. Heightened electrocortical engagement in socially anxious participants was present in the first second of stimulus viewing, and was sustained for the entire presentation period. These results, based on a continuous measure of attentional resource allocation, support the view that stimuli of high personal significance are associated with early and sustained prioritized sensory processing. These cues, however, do not interfere with the electrocortical processing of a spatially separated concurrent face, suggesting that they are effective at capturing attention, but are weak competitors for resources.
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