Attention modulates spatial priority maps in the human occipital, parietal and frontal cortices.

Attention modulates spatial priority maps in the human occipital, parietal and frontal cortices.
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DOI:
10.1038/nn.3574
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发表时间:
2013-12
影响因子:
25
通讯作者:
Serences, John T.
Serences, John T.
中科院分区:
医学1区
文献类型:
--
作者:
Sprague, Thomas C.;Serences, John T.

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计算理论认为,注意调节了视觉皮层区域空间优先地图的地形景观,从而使重要物体的位置与更高的激活水平相关联。虽然单单位记录研究已经证明了与注意相关的神经反应增益的增加和空间感受野大小的变化,但这些调制对区域一级优先图的地形的净影响尚未被调查。在这里,我们使用功能磁共振成像和多变量编码模型来重建关注和忽略刺激的空间表示,使用整个视觉区域的激活模式。这些重建的空间表征揭示了注意力对整个视觉层次中假定优先图中刺激表征的幅度和大小的影响。我们的结果表明,注意力增加了这些空间地图中刺激表征的幅度,特别是在较高视觉区域,但不会实质上改变它们的大小。
Computational theories propose that attention modulates the topographical landscape of spatial ‘priority’ maps in regions of visual cortex so that the location of an important object is associated with higher activation levels. While single-unit recording studies have demonstrated attention-related increases in the gain of neural responses and changes in the size of spatial receptive fields, the net effect of these modulations on the topography of region-level priority maps has not been investigated. Here, we used fMRI and a multivariate encoding model to reconstruct spatial representations of attended and ignored stimuli using activation patterns across entire visual areas. These reconstructed spatial representations reveal the influence of attention on the amplitude and size of stimulus representations within putative priority maps across the visual hierarchy. Our results suggest that attention increases the amplitude of stimulus representations in these spatial maps, particularly in higher visual areas, but does not substantively change their size.
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