Temporal orienting precedes intersensory attention and has opposing effects on early evoked brain activity
Temporal orienting precedes intersensory attention and has opposing effects on early evoked brain activity
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DOI：
10.1016/j.neuroimage.2017.01.039
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发表时间：
2017-03-01
期刊：
影响因子：
5.7
通讯作者：
Senkowski, Daniel
中科院分区：
文献类型：
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作者：
Keil, Julian;Pomper, Ulrich;Senkowski, Daniel
感觉间注意（IA）描述了将注意力引导到特定模态的过程。时间定向（TO）的特点是将注意力集中在特定的时刻。以前的研究表明，这两个过程可能对早期诱发的大脑活动产生相反的影响。这两个进程的确切时间进程和处理阶段仍然未知。在这项人类脑电图研究中，我们研究了IA和TO在一个范式内对视觉触觉刺激处理的影响。IA操纵听觉线索，以表明是否参与者应该检测视觉或触觉刺激的目标。通过以固定或可变的刺激间间隔逐块呈现刺激来操纵TO。我们观察到TO影响IA之前对视觉触觉刺激的诱发活动。此外，我们发现，TO降低了早期诱发脑活动的幅度，而IA增强了它。使用波束形成器源定位，我们观察到，IA增加了神经反应的感官领域的出席方式，而TO降低了大脑活动在广泛的皮层区域。基于这些发现，我们得出一个更新的工作模型的时间和感觉间注意的影响，早期诱发脑活动。
Intersensory attention (IA) describes the process of directing attention to a specific modality. Temporal orienting (TO) characterizes directing attention to a specific moment in time. Previously, studies indicated that these two processes could have opposite effects on early evoked brain activity. The exact time-course and processing stages of both processes are still unknown. In this human electroencephalography study, we investigated the effects of IA and TO on visuo-tactile stimulus processing within one paradigm. IA was manipulated by presenting auditory cues to indicate whether participants should detect visual or tactile targets in visuo-tactile stimuli. TO was manipulated by presenting stimuli block -wise at fixed or variable inter-stimulus intervals. We observed that TO affects evoked activity to visuo-tactile stimuli prior to IA. Moreover, we found that TO reduces the amplitude of early evoked brain activity, whereas IA enhances it. Using beamformer source localization, we observed that IA increases neural responses in sensory areas of the attended modality whereas TO reduces brain activity in widespread cortical areas. Based on these findings we derive an updated working model for the effects of temporal and intersensory attention on early evoked brain activity.