Attentional control: temporal relationships within the fronto-parietal network.
Attentional control: temporal relationships within the fronto-parietal network.
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DOI：
10.1016/j.neuropsychologia.2012.02.009
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发表时间：
2012-05
期刊：
影响因子：
2.6
通讯作者：
Behrmann M
中科院分区：
文献类型：
--
作者：
Shomstein S;Kravitz DJ;Behrmann M
对传入的感觉信息的特定方面的选择性注意是由神经区域网络实现的，该网络包括额叶皮层、后顶叶皮层，以及视觉领域的视觉感觉区域。虽然在理解这些不同区域对视觉注意选择过程的相对贡献方面取得了进展，主要是通过神经影像学的研究，但对这些不同区域之间的时间关系知之甚少。为了验证这一点，参与者观看了定位在注视点左右的两个快速连续视觉呈现（RSVP）字母流。在每次运行之前，注意力被引导到左边或右边的流。偶尔，在被关注的流中出现一个数字，表示注意力是在同一流中保持（‘ hold ’条件）还是转移到先前忽略的流（‘ shift ’条件）。通过使用细粒度的心理物理学范式滴定每个参与者转移注意力所需时间的时间参数，我们测量了与注意力空间转移起始时间锁定的事件相关电位。结果显示，在额叶电极上记录的反应中，注意力的转移比在顶叶电极上记录的反应更早，重要的是，额叶电极上的早期活动与注意力的成功转移有关。我们的结论是，为了执行注意力转移，额叶区域很可能在早期就参与其中，通过额顶叶网络触发级联反应，最终导致后皮层对感觉事件的注意调节。
The selective attention to particular aspects of incoming sensory information is enabled by a network of neural areas that includes frontal cortex, posterior parietal cortex, and, in the visual domain, visual sensory regions. Although progress has been made in understanding the relative contribution of these different regions to the process of visual attentional selection, primarily through studies using neuroimaging, rather little is known about the temporal relationships between these disparate regions. To examine this, participants viewed two rapid serial visual presentation (RSVP) streams of letters positioned to the left and right of fixation point. Before each run, attention was directed to either the left or the right stream. Occasionally, a digit appeared within the attended stream indicating whether attention was to be maintained within the same stream (‘hold’ condition) or to be shifted to the previously ignored stream (‘shift’ condition). By titrating the temporal parameters of the time taken to shift attention for each participant using a fine-grained psychophysics paradigm, we measured event-related potentials time-locked to the initiation of spatial shifts of attention. The results revealed shifts of attention were reflected earlier in the response recorded over frontal than over parietal electrodes and, importantly, that the early activity over frontal electrodes was associated with a successful shift of attention. We conclude that frontal areas are engaged early for the purpose of executing an attentional shift, likely triggering a cascade through the fronto-parietal network and, ultimately, resulting in attentional modulation of sensory events in posterior cortices.
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影响因子：
13.9
作者：
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通讯作者：
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DOI：
10.1073/pnas.0907658106
发表时间：
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