Cortical mechanisms for shifting and holding visuospatial attention
Cortical mechanisms for shifting and holding visuospatial attention
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DOI：
10.1093/cercor/bhm036
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发表时间：
2008-01-01
期刊：
影响因子：
3.7
通讯作者：
Yantis, Steven
中科院分区：
文献类型：
--
作者：
Kelley, Todd A.;Serences, John T.;Yantis, Steven
视觉意识的获得往往取决于视觉注意力的隐蔽、自愿部署。没有眼球运动的自主定向需要将注意力从注视点分离，转移到期望的位置，并在该位置保持注意力。我们使用事件相关的功能磁共振成像来分离这些组件，而观察者转移注意力的3个字母和数字流，一个位于固定和2在周边。与将注意力保持在当前位置相比，在周围位置之间转移注意力与上级顶叶（SPL）和额叶眼区（FEF）的神经活动短暂增加有关，如先前的研究所示。补充眼场和SPL和FEF的单独部分更积极地将注意力从固定中分离出来，而不是将注意力转移到一个新的位置。大部分的中央前沟（PreCS）和后顶叶皮层（PPC）更活跃时，注意力保持在周边比保持固定。我们的结论是，背侧额顶叶网络的不同的子组件启动重新部署的隐蔽注意到新的位置和脱离注意固定，而持续的活动在PPC和PreCS的横向区域代表持续的周边注意状态。
Access to visual awareness is often determined by covert, voluntary deployments of visual attention. Voluntary orienting without eye movements requires decoupling attention from the locus of fixation, a shift to the desired location, and maintenance of attention at that location. We used event-related functional magnetic resonance imaging to dissociate these components while observers shifted attention among 3 streams of letters and digits, one located at fixation and 2 in the periphery. Compared with holding attention at the current location, shifting attention between the peripheral locations was associated with transient increases in neural activity in the superior parietal lobule (SPL) and frontal eye fields (FEF), as in previous studies. The supplementary eye fields and separate portions of SPL and FEF were more active for decoupling attention from fixation than for shifting attention to a new location. Large segments of precentral sulcus (PreCS) and posterior parietal cortex (PPC) were more active when attention was maintained in the periphery than when it was maintained at fixation. We conclude that distinct subcomponents of the dorsal frontoparietal network initiate redeployments of covert attention to new locations and disengage attention from fixation, while sustained activity in lateral regions of PPC and PreCS represents sustained states of peripheral attention.