Tactile-visual links in exogenous spatial attention under different postures: Convergent evidence from psychophysics and ERPs
Tactile-visual links in exogenous spatial attention under different postures: Convergent evidence from psychophysics and ERPs
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DOI：
10.1162/08989290152001899
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发表时间：
2001-05-01
影响因子：
3.2
通讯作者：
Driver, J
中科院分区：
文献类型：
--
作者：
Kennett, S;Eimer, M;Driver, J
空间注意力的触觉-视觉联系进行了检查，提出了空间非预测性触觉线索的左手或右手，前不久在左或右半野的视觉目标。为了检查任何跨模态链接的空间坐标，检查了不同的姿势。双手要么不交叉，要么交叉，使左手位于右视野，反之亦然。视觉判断在受刺激的手所在的一侧更好，尽管这种效果在提示和目标之间的时间间隔较长以及双手交叉的情况下较小。事件相关脑电位（ERP）显示了类似的模式。在同侧电极部位，与前一个触觉提示相同侧的视觉事件获得了更大幅度的枕叶N1分量。在中线和横向中心站点的Nd 2间隔中的负性，以及在电极Pz的Nd 1间隔中的负性，也增强了提示侧。正如在心理物理学的结果，ERP提示效果在交叉的姿势是由一侧的空间中，受刺激的手躺，而不是由解剖侧的初始半球投影的触觉提示。这些结果表明，在空间注意力的跨模态链接可以影响感觉的大脑反应，早在N1，这些链接在一个空间的参考框架，可以重新映射之间的方式跨越姿势的变化。
Tactile-visual links in spatial attention were examined by presenting spatially nonpredictive tactile cues to the left or right hand, shortly prior to visual targets in the left or right hemifield. To examine the spatial coordinates of any crossmodal links, different postures were examined. The hands were either uncrossed, or crossed so that the left hand lay in the right visual field and vice versa. Visual judgments were better on the side where the stimulated hand lay, though this effect was somewhat smaller with longer intervals between cue and target, and with crossed hands. Event-related brain potentials (ERPs) showed a similar pattern. Larger amplitude occipital N1 components were obtained for visual events on the same side as the preceding tactile cue, at ipsilateral electrode sites. Negativities in the Nd2 interval at midline and lateral central sites, and in the Nd1 interval at electrode Pz, were also enhanced for the cued side. As in the psychophysical results, ERP cueing effects during the crossed posture were determined by the side of space in which the stimulated hand lay, not by the anatomical side of the initial hemispheric projection for the tactile cue. These results demonstrate that crossmodal links in spatial attention can influence sensory brain responses as early as the N1, and that these links operate in a spatial frame-of-reference that can remap between the modalities across changes in posture.