Human feature-based attention consists of two distinct spatiotemporal processes
Human feature-based attention consists of two distinct spatiotemporal processes
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DOI：
10.1167/15.8.8
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发表时间：
2015-01-01
影响因子：
1.8
通讯作者：
Wegener, Detlef
中科院分区：
文献类型：
--
作者：
Gledhill, Daniela;Grimsen, Cathleen;Wegener, Detlef
在人类和非人类灵长类动物中，目标导向的行为需要从大量同时发生的感官输入中选择相关的信息。基于视觉的注意（FBA）在这种选择中起着至关重要的作用，通过改善神经元的代表出席刺激功能。特别感兴趣的理解FBA背后的神经机制是处理命运的空间无人值守的刺激，无论是共享出席的功能属性或属于出席或非出席的功能尺寸。使用广泛的线索/刺激组合，我们研究了事件相关电位从人脑中，记录在不同的功能注意，但恒定的视觉刺激的条件下。我们发现，神经处理的视觉刺激共享的维度或属性的出席目标与两个不同的时空过程，特别是在选择负性期间突出。基于听觉的神经信号调制首先出现在额叶电极部位，并且在时间上先于并伴随着枕叶、顶叶-枕叶和顶叶电极处的属性特异性FBA效应。研究结果表明，FBA的过程中，不仅增加了这些神经元的反应，特别是调谐到出席的属性，但也调制活动的皮质模块是选择性的特征维度出席的属性属于。
In human and nonhuman primates, goal-directed behavior requires the selection of relevant pieces of information from the multitude of simultaneous sensory inputs. Feature-based attention (FBA) plays a crucial role in this selection by improving the neuronal representation of an attended stimulus feature. Of particular interest for understanding the neuronal mechanisms behind FBA is the processing fate of spatially unattended stimuli, either sharing the attended feature attribute or belonging to the attended or to a nonattended feature dimension. Using a wide range of cue/stimulus combinations, we investigated event-related potentials from the human brain, recorded under conditions of different feature attention but constant visual stimulation. We found that neural processing of visual stimuli sharing the dimension or the attribute of the attended target is associated with two distinct spatiotemporal processes, particularly prominent during the selection negativity period. Dimension-based modulation of neural signals first emerged over frontal electrode sites, and temporally preceded and accompanied attribute-specific FBA effects at occipital, parieto-occipital, and parietal electrodes. The findings suggest a process of FBA that not only increases responses of those neurons particularly tuned to the attended attribute but also modulates activity in the cortical module that is selective for the feature dimension to which the attended attribute belongs.