Remapping attentional priorities: Differential contribution of superior parietal lobule and intraparietal sulcus
Remapping attentional priorities: Differential contribution of superior parietal lobule and intraparietal sulcus
复制标题
DOI：
10.1093/cercor/bhl179
复制
发表时间：
2007-11-01
期刊：
影响因子：
3.7
通讯作者：
Vandenberghe, Rik R. C.
中科院分区：
文献类型：
--
作者：
Molenberghs, Pascal;Mesulam, Marsel M.;Vandenberghe, Rik R. C.
在动态环境中寻找和选择性地关注重要的个人外刺激需要更新注意优先图。使用功能性磁共振成像，我们研究了后顶叶皮层在这种重新分配注意力优先级中的作用，在这种情况下，刺激的配置、位置和重要性是系统变化的。我们的数据揭示了两个并列的后顶叶区域之间的功能分离：一个在顶叶上小叶（SPL），另一个在顶叶内沟（IPS）。在目标位置、干扰物位置或注意焦点位置发生空间位移的所有条件下（外源性和内源性空间注意转移），SPL优先被激活。注意焦点的转移也激活了IPS，但主要是由内部关联规则而不是刺激位移本身引导的（内源性注意转移）。当刺激配置发生变化时，只有IPS区域被短暂的目标显著性重置激活，而注意焦点保持空间固定（特征注意转移）。因此，额顶叶空间注意网络的这两个组成部分具有共同和独特的功能。具体而言，IPS组件与注意优先图的编制更密切相关，包括注意权重的内源性重新校准。另一方面，SPL分量与与注意优先级（空间转移）相关的空间坐标的修改更密切相关。总的来说，这两个区域允许后顶叶皮层根据空间坐标和效价动态编码个人外事件。
Seeking and selectively attending to significant extrapersonal stimuli in a dynamic environment requires the updating of an attentional priority map. Using functional magnetic resonance imaging, we investigated the role of posterior parietal cortex in such remappings of attentional priorities where the configuration, location, and significance of stimuli were systematically varied. Our data revealed a functional dissociation between 2 juxtaposed posterior parietal regions: one in the superior parietal lobule (SPL) and another in the intraparietal sulcus (IPS). SPL was preferentially activated in all conditions where a spatial displacement occurred in the location of the target, the location of the distracter, or the focus of attention (exogenous and endogenous shifts of spatial attention). Shifts of the attentional focus also activated the IPS but principally if they were guided endogenously by internal rules of relevance rather than stimulus displacement per se (endogenous attention shifts). Only the IPS region was activated by transient resetting of target significance when the stimulus configuration changed but the attentional focus remained spatially fixed (feature attention shifts). These 2 components of the largescale frontoparietal spatial attention network therefore have common and distinctive functions. In specific, the IPS component is more closely related to the compilation of an attentional priority map, including the endogenous recalibration of attentional weights. The SPL component, on the other hand, is more closely related to the modification of spatial coordinates linked to attentional priorities (spatial shifting). Collectively, these 2 areas allow posterior parietal cortex to dynamically encode extrapersonal events according to their spatial coordinates and valence.