Praamstra Peter, Boutsen Luc, Humphreys Glyn W
Behavioural Brain Sciences Centre, School of Psychology, University of Birmingham, Birmingham B15 2TT, UK.
J Neurophysiol. 2005 Jul;94(1):764-74. doi: 10.1152/jn.01052.2004. Epub 2005 Mar 2.
Relations between spatial attention and motor intention were investigated by means of an EEG potential elicited by shifting attention to a location in space as well as by the selection of a hand for responding. High-density recordings traced this potential to a common frontoparietal network activated by attentional orienting and by response selection. Within this network, parietal and frontal cortex were activated sequentially, followed by an anterior-to-posterior migration of activity culminating in the lateral occipital cortex. Based on temporal and polarity information provided by EEG, we hypothesize that the frontoparietal activation, evoked by directional information, updates a task-defined preparatory state by deselecting or inhibiting the behavioral option competing with the cued response side or the cued direction of attention. These results from human EEG demonstrate a direct EEG manifestation of the frontoparietal attention network previously identified in functional imaging. EEG reveals the time-course of activation within this network and elucidates the generation and function of associated directing-attention EEG potentials. The results emphasize transient activation and a decision-related function of the frontoparietal attention network, contrasting with the sustained preparatory activation that is commonly inferred from neuroimaging.
通过将注意力转移到空间中的某个位置以及选择一只手进行反应所引发的脑电图电位，研究了空间注意力与运动意图之间的关系。高密度记录将这种电位追溯到一个由注意力定向和反应选择激活的共同额顶叶网络。在这个网络中，顶叶和额叶皮层依次被激活，随后活动从前向后迁移，最终在枕叶外侧皮层达到顶峰。根据脑电图提供的时间和极性信息，我们假设由方向信息引发的额顶叶激活通过取消选择或抑制与提示反应侧或提示注意力方向竞争的行为选项，来更新任务定义的准备状态。这些来自人类脑电图的结果证明了先前在功能成像中确定的额顶叶注意力网络的直接脑电图表现。脑电图揭示了该网络内的激活时间进程，并阐明了相关定向注意力脑电图电位的产生和功能。结果强调了额顶叶注意力网络的瞬时激活和与决策相关的功能，这与通常从神经成像中推断出的持续准备激活形成对比。
