Neural Mechanisms of Attentional Reorienting in Three-Dimensional Space
Neural Mechanisms of Attentional Reorienting in Three-Dimensional Space
复制标题
三维空间注意力重新定向的神经机制
DOI：
10.1523/jneurosci.1772-12.2012
复制
发表时间：
2012-09-26
影响因子：
5.3
通讯作者：
Fink, Gereon R.
中科院分区：
文献类型：
--
作者：
Chen, Qi;Weidner, Ralph;Fink, Gereon R.
人脑如何从二维 (2D) 视网膜图像重建三维 (3D) 世界以及我们如何在 2D 空间中转移注意力已引起广泛关注。相比之下，人们对视觉空间注意力如何深度转移仍然知之甚少。在这项 fMRI 研究中，通过在 MR 扫描仪中构建虚拟 3D 环境，并以波斯纳空间提示范式的改编版本呈现靠近或远离参与者的目标，我们深入研究了视觉空间定向/重新定向的行为和神经机制。在行为层面上，尽管覆盖相同的空间距离，但对意外出现的更靠近观察者和无人关注的半空间中的物体的注意力重新定向比对更远的意外物体的注意力重新定向要快。在神经水平上，我们发现除了右侧颞顶交界处的经典注意力重新定向系统之外，另外两个大脑网络在深度重新定向方面也有不同程度的参与。首先，与同一深度平面内的注意力重新定向相比，双侧前运动皮层特别沿着视觉空间的第三维（即从近到远或反之亦然）重新定向视觉空间注意力。其次，一个让人想起人类“默认模式网络”的区域网络，包括后扣带皮层、眶前额叶皮层和左角回，通过促进注意力重新定向到更靠近观察者和无人看管的半空间中出现的意外物体，参与深度和注意力定向之间的神经相互作用。
How the human brain reconstructs the three-dimensional (3D) world from two-dimensional (2D) retinal images has received a great deal of interest as has how we shift attention in 2D space. In contrast, it remains poorly understood how visuospatial attention is shifted in depth. In this fMRI study, by constructing a virtual 3D environment in the MR scanner and by presenting targets either close to or far from the participants in an adapted version of the Posner spatial-cueing paradigm, we investigated the behavioral and neural mechanisms underlying visuospatial orienting/reorienting in depth. At the behavioral level, although covering the same spatial distance, attentional reorienting to objects unexpectedly appearing closer to the observer and in the unattended hemispace was faster than reorienting to unexpected objects farther away. At the neural level, we found that in addition to the classical attentional reorienting system in the right temporoparietal junction, two additional brain networks were differentially involved in aspects of attentional reorienting in depth. First, bilateral premotor cortex reoriented visuospatial attention specifically along the third dimension of visual space (i.e., from close to far or vice versa), compared with attentional reorienting within the same depth plane. Second, a network of areas reminiscent of the human “default-mode network,” including posterior cingulate cortex, orbital prefrontal cortex, and left angular gyrus, was involved in the neural interaction between depth and attentional orienting, by boosting attentional reorienting to unexpected objects appearing both closer to the observer and in the unattended hemispace.