Theta Oscillations Index Frontal Decision-Making and Mediate Reciprocal Frontal-Parietal Interactions in Willed Attention.
Theta Oscillations Index Frontal Decision-Making and Mediate Reciprocal Frontal-Parietal Interactions in Willed Attention.
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DOI：
10.1093/cercor/bhy149
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发表时间：
2018-06
期刊：
影响因子：
3.7
通讯作者：
A. Rajan;S. Siegel;Yuelu Liu;J. Bengson;G. Mangun;M. Ding
中科院分区：
文献类型：
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作者：
A. Rajan;S. Siegel;Yuelu Liu;J. Bengson;G. Mangun;M. Ding
注意力可以通过感官信号反射性地吸引，通过学习或奖励产生偏差，或者根据瞬时目标自愿集中注意力。当自愿注意力集中在纯粹的内部决策过程（意志），而不是通过外部线索的指令时，我们称之为“意志注意力”。在之前的工作中，我们报道了 ERP 和 fMRI 在逐次试验提示任务中与意愿空间注意力的相关性。在这里，我们通过对比教学线索和选择线索之间的事件相关脑电图谱，进一步研究了意志注意的振荡机制。使用相同的视觉空间注意力范式在两个不同的地点进行了两个实验。与两个实验一致的是，我们发现，相对于指令性注意力，意志性注意力的额叶 theta 功率（从提示后约 500 毫秒开始）有所增加。这种额叶 θ 的增加伴随着额叶-顶叶 θ 带一致性和双向格兰杰因果关系的增加。此外，与指令性注意力相比，与注意力相关的后α功率偏侧化的发生在意志性注意力中延迟，并且延迟的量与额叶θ增加的时间有关。这些结果在两个实验中得到重复，表明 θ 振荡是指示额叶皮层决策的神经元信号，并在意志注意期间介导额叶执行区域和顶叶注意力控制区域之间的相互通信。
Attention can be attracted reflexively by sensory signals, biased by learning or reward, or focused voluntarily based on momentary goals. When voluntary attention is focused by purely internal decision processes (will), rather than instructions via external cues, we call this "willed attention." In prior work, we reported ERP and fMRI correlates of willed spatial attention in trial-by-trial cuing tasks. Here we further investigated the oscillatory mechanisms of willed attention by contrasting the event-related EEG spectrogram between instructional and choice cues. Two experiments were conducted at 2 different sites using the same visuospatial attention paradigm. Consistent between the 2 experiments, we found increases in frontal theta power (starting at ~500 ms post cue) for willed attention relative to instructed attention. This frontal theta increase was accompanied by increased frontal-parietal theta-band coherence and bidirectional Granger causality. Additionally, the onset of attention-related posterior alpha power lateralization was delayed in willed attention relative to instructed attention, and the amount of delay was related to the timing of frontal theta increase. These results, replicated across 2 experiments, suggest that theta oscillations are the neuronal signals indexing decision-making in the frontal cortex, and mediating reciprocal communications between the frontal executive and parietal attentional control regions during willed attention.