Hemispheric Asymmetries in Tracking Occluded Moving Targets with the Mind's Eye: Simultaneous Event-Related fMRI and Eye-Movement Recording
Hemispheric Asymmetries in Tracking Occluded Moving Targets with the Mind's Eye: Simultaneous Event-Related fMRI and Eye-Movement Recording
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DOI：
10.1007/s11682-008-9040-5
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发表时间：
2008-12-01
影响因子：
3.2
通讯作者：
Powell, David K.
中科院分区：
文献类型：
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作者：
Jiang, Yang;Ding, Jinhong;Powell, David K.
眼睛和大脑预测和跟踪可见和被遮挡的移动目标的能力对于目标导向的行动至关重要。事件相关的功能磁共振成像和眼球运动的同时进行了测量，在一个平稳的追求任务与不同水平的视觉线索。受试者跟踪一个白色点，该点按照正弦曲线模式从左向右移动，在此期间，可以在屏幕的一半上看到该点（可见条件），然后消失在遮挡条后面（遮挡条件）。当跟踪被遮挡的移动目标时，我们在早期视觉皮层观察到半球不对称，但在运动处理区MT/V5没有观察到。在眼动追踪过程中，左侧早期视皮层对可见目标的反应比右侧强，但右侧对遮挡目标的反应更强。相比之下，运动处理区MT/V5在两个半球有利于可见的被遮挡的目标。这些结果表明，右早期视觉皮层是大脑的眼睛，接收来自更高级别记忆区域的输入，以在遮挡期间产生模拟视觉。
The ability of the eyes and brain to predict and track visible and occluded moving targets is essential to goal-directed action. Event-related functional MRI and eye-movements were simultaneously measured during a smooth pursuit task with different levels of visual cuing. Subjects tracked a white dot moving from left to right following a sinusoidal pattern, during which it could be seen over half the screen (visible condition) before disappearing behind the occlusion bar (occluded condition). When tracking occluded, moving targets, we observed a hemisphere asymmetry at the early visual cortex, but not in motion-processing area MT/V5. During eye-tracking, the left early visual cortex responded stronger than the right to visible targets, but the right responded stronger to occluded targets. In contrast, motion-processing area MT/V5 in both hemispheres favored visible over occluded targets. These results suggest the right early visual cortex is the mind's eye, receiving input from higher level memory regions to produce simulated vision during occlusion.