Cross-modal links in endogenous spatial attention are mediated by common external locations: evidence from event-related brain potentials
Cross-modal links in endogenous spatial attention are mediated by common external locations: evidence from event-related brain potentials
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DOI：
10.1007/s002210100773
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发表时间：
2001-08-01
影响因子：
2
通讯作者：
Driver, J
中科院分区：
文献类型：
--
作者：
Eimer, M;Cockburn, D;Driver, J
最近的行为和事件相关电位（ERP）的研究报告的视觉，听觉和触觉之间的空间注意的跨通道的联系。这种联系可能反映了与对一侧的空间注意相关的半球激活水平的差异，或者反映了更抽象的空间参考框架介导的跨模态选择性。为了区分这些假设，ERP记录到横向触觉刺激，加上视觉（实验1）或听觉刺激（实验2），而参与者出席了左手或右手检测不常见的触觉目标，并忽略其他方式。在不同的区块中，手要么交叉，要么不交叉。非交叉手，视觉刺激的触觉出席侧引起增强的N1和P2成分在枕部网站。中线电极的负性增强，反映了从触摸到视觉的空间注意力的交叉模式联系。听觉刺激在触觉出席的位置引起了增强的负性重叠的N1组件，反映从触摸到听觉的跨模态链接。交叉的手出现了类似的结果模式，触觉注意增强了被注意的手现在所在的一侧的听觉或视觉反应（即在与未交叉时注意同一只手所增强的视觉或听觉半野相反的位置）。这表明，跨通道注意链接不是由半球投射决定的，而是由共同的外部位置决定的。出乎意料的是，体感ERPs强烈影响手的姿势在两个实验中，注意力的影响延迟和较小的交叉手。这可能反映了触觉模态内的解剖和外部空间代码的综合影响，而跨模态链接仅取决于后者的代码。
Recent behavioural and event-related potential (ERP) studies reported cross-modal links in spatial attention between vision, audition and touch. Such links could reflect differences in hemispheric-activation levels associated with spatial attention to one side, or more abstract spatial reference-frames mediating selectivity across modalities. To distinguish these hypotheses, ERPs were recorded to lateral tactile stimuli, plus visual (experiment 1) or auditory stimuli (experiment 2), while participants attended to the left or right hand to detect infrequent tactile targets, and ignored other modalities. In separate blocks, hands were either in a crossed or uncrossed posture. With uncrossed hands, visual stimuli on the tactually attended side elicited enhanced N1 and P2 components at occipital sites. and an enhanced negativity at midline electrodes, reflecting cross-modal links in spatial attention from touch to vision. Auditory stimuli at tactually attended locations elicited an enhanced negativity overlapping with the N1 component, reflecting crossmodal links from touch to audition. An analogous pattern of results arose for crossed hands, with tactile attention enhancing auditory or visual responses on the side where the attended hand now lay (i.e. in the opposite visual or auditory hemifield to that enhanced by attending the same hand when uncrossed). This suggests that cross-modal attentional links are not determined by hemispheric projections, but by common external locations. Unexpectedly, somatosensory ERPs were strongly affected by hand posture in both experiments, with attentional effects delayed and smaller for crossed hands. This may reflect the combined influence of anatomical and external spatial codes within the tactile modality, while cross-modal links depend only on the latter codes.