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首页> 外文期刊>The European Journal of Neuroscience >Hemispheric lateralization in top-down attention during spatial relation processing: a Granger causal model approach
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Hemispheric lateralization in top-down attention during spatial relation processing: a Granger causal model approach

机译：在空间关系处理过程中自上而下注意的半球偏侧化：Granger因果模型方法

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Magnetoencephalography was recorded during a matching-to-sample plus cueing paradigm, in which participants judged the occurrence of changes in either categorical (CAT) or coordinate (COO) spatial relations. Previously, parietal and frontal lobes were identified as key areas in processing spatial relations and it was shown that each hemisphere was differently involved and modulated by the scope of the attention window (e.g. a large and small cue). In this study, Granger analysis highlighted the patterns of causality among involved brain areas - the direction of information transfer ran from the frontal to the visual cortex in the right hemisphere, whereas it ran in the opposite direction in the left side. Thus, the right frontal area seems to exert top-down influence, supporting the idea that, in this task, top-down signals are selectively related to the right side. Additionally, for CAT change preceded by a small cue, the right frontal gyrus was not involved in the information transfer, indicating a selective specialization of the left hemisphere for this condition. The present findings strengthen the conclusion of the presence of a remarkable hemispheric specialization for spatial relation processing and illustrate the complex interactions between the lateralized parts of the neural network. Moreover, they illustrate how focusing attention over large or small regions of the visual field engages these lateralized networks differently, particularly in the frontal regions of each hemisphere, consistent with the theory that spatial relation judgements require a fronto-parietal network in the left hemisphere for categorical relations and on the right hemisphere for coordinate spatial processing.
机译：在匹配样本和提示范例期间记录了脑磁图，其中参与者判断类别（CAT）或坐标（COO）空间关系发生了变化。以前，顶叶和额叶被确定为处理空间关系的关键区域，并且显示出每个半球受关注窗口范围（例如大和小提示）的影响和参与程度有所不同。在这项研究中，格兰杰（Granger）分析突出显示了所涉及的大脑区域之间的因果关系模式-信息传递的方向是从右半球的额叶皮层到视觉皮层，而信息传递的方向是在左侧的相反方向。因此，右额区似乎发挥了自上而下的影响，支持了在此任务中自上而下的信号与右侧选择性相关的想法。此外，对于先于小提示的CAT改变，信息传递不涉及右额回，这表明左半球对此情况有选择性的专门化。目前的发现加强了对空间关系处理中显着的半球专业化存在的结论，并说明了神经网络侧向部分之间的复杂相互作用。此外，它们还说明了如何将注意力集中在视野的大或小区域上，特别是在每个半球的额叶区域中，如何使这些侧化的网络变得不同，这与空间关系判断需要左半球的额顶网络有关的理论是一致的。分类关系和在右半球上进行坐标空间处理。

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