The activation of attentional networks
The activation of attentional networks
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DOI：
10.1016/j.neuroimage.2005.02.004
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发表时间：
2005-06-01
期刊：
影响因子：
5.7
通讯作者：
Posner, MI
中科院分区：
文献类型：
--
作者：
Fan, J;McCandliss, BD;Posner, MI
警觉、定向和执行控制被广泛认为是注意力的相对独立的方面，与可分离的大脑区域有关。然而，神经影像学研究尚未检验在执行相同任务的相同受试者中这三个方面注意力在解剖学上可分离性的证据。注意力网络测试（ANT）检查线索和目标在单一反应时间任务中的作用，以提供一种探索注意力中涉及的警觉、定向和执行控制网络的效率的方法。它还提供了一个机会，以检查这三个网络的大脑活动，因为它们在一个单一的综合任务。我们使用事件相关功能磁共振成像（fMRI）来探索ANT针对的三个注意系统所涉及的脑区。警戒对比显示强烈的丘脑参与和激活的前部和后部皮质网站。正如预期的那样，定向对比激活了顶叶部位和额叶眼区。执行控制网络对比显示，前扣带沿着与其他几个大脑区域的激活。除了一些例外，这三个网络在这个单一任务中的激活模式与以前在单独任务中研究的功能磁共振成像研究是一致的。总的来说，功能磁共振成像结果表明，在这个单一的任务差异激活三个可分离的解剖网络有关的注意力的组成部分。(c)2005年爱思唯尔公司All rights reserved.
Alerting, orienting, and executive control are widely thought to be relatively independent aspects of attention that are linked to separable brain regions. However, neuroimaging studies have yet to examine evidence for the anatomical separability of these three aspects of attention in the same subjects performing the same task. The attention network test (ANT) examines the effects of cues and targets within a single reaction time task to provide a means of exploring the efficiency of the alerting, orienting, and executive control networks involved in attention. It also provides an opportunity to examine the brain activity of these three networks as they operate in a single integrated task. We used event-related functional magnetic resonance imaging (fMRI) to explore the brain areas involved in the three attention systems targeted by the ANT. The alerting contrast showed strong thalamic involvement and activation of anterior and posterior cortical sites. As expected, the orienting contrast activated parietal sites and frontal eye fields. The executive control network contrast showed activation of the anterior cingulate along with several other brain areas. With some exceptions, activation patterns of these three networks within this single task are consistent with previous fMRI studies that have been studied in separate tasks. Overall, the fMRI results suggest that the functional contrasts within this single task differentially activate three separable anatomical networks related to the components of attention. (c) 2005 Elsevier Inc. All rights reserved.