Brefczynski J A, DeYoe E A
Department of Cellular Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee 53226, USA.
Nat Neurosci. 1999 Apr;2(4):370-4. doi: 10.1038/7280.
Here we identify a neural correlate of the ability to precisely direct visual attention to locations other than the center of gaze. Human subjects performed a task requiring shifts of visual attention (but not of gaze) from one location to the next within a dense array of targets and distracters while functional MRI was used to map corresponding displacements of neural activation within visual cortex. The cortical topography of the purely attention-driven activity precisely matched the topography of activity evoked by the cued targets when presented in isolation. Such retinotopic mapping of attention-related activation was found in primary visual cortex, as well as in dorsomedial and ventral occipital visual areas previously implicated in processing the attended target features. These results identify a physiological basis for the effects of spatially directed visual attention.
在此，我们确定了一种神经关联，它与将视觉注意力精确引导至注视中心以外位置的能力有关。人类受试者执行一项任务，即在密集排列的目标和干扰物阵列中，将视觉注意力（而非注视）从一个位置转移到下一个位置，同时使用功能磁共振成像来绘制视觉皮层内神经激活的相应位移。当单独呈现提示目标时，纯粹由注意力驱动的活动的皮质地形图与提示目标诱发的活动地形图精确匹配。在初级视觉皮层以及先前与处理被关注目标特征有关的背内侧和腹侧枕叶视觉区域中，发现了与注意力相关激活的这种视网膜拓扑映射。这些结果确定了空间定向视觉注意力效应的生理基础。
