Green Jessica J, Conder Julie A, McDonald John J
Department of Psychology, Simon Fraser University, Burnaby, British Columbia, Canada.
Psychophysiology. 2008 Jul;45(4):579-87. doi: 10.1111/j.1469-8986.2008.00657.x. Epub 2008 Feb 11.
In event-related potential studies of voluntary spatial attention, lateralized activity observed over anterior scalp sites prior to an impending target has been interpreted as the activity of a supramodal attentional control mechanism in the frontal lobes. However, variability in the scalp topography and presence of this activity across studies suggests that multiple neural generators contribute to the lateralized activity recorded at the scalp. Using distributed source modeling we found two distinct frontal lobe sources following attention-directing cues, one dependent on the sensory modality of the eliciting stimulus and one dependent on the response requirements of the task. Differential activity of these sources depending on task parameters suggests that neither source reflects activity necessary for controlling attention.
在与事件相关电位的自愿空间注意研究中，在即将出现的目标之前在前额头皮部位观察到的偏侧化活动被解释为额叶中一种超模式注意控制机制的活动。然而，头皮地形图的变异性以及不同研究中这种活动的存在表明，多个神经发生器对头皮记录的偏侧化活动有贡献。使用分布式源模型，我们发现在注意力引导线索之后有两个不同的额叶源，一个依赖于引发刺激的感觉模态，另一个依赖于任务的反应要求。这些源根据任务参数的差异活动表明，这两个源都不反映控制注意力所需的活动。
