The native coordinate system of spatial attention is retinotopic.
The native coordinate system of spatial attention is retinotopic.
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DOI：
10.1523/jneurosci.2525-08.2008
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发表时间：
2008-10-15
期刊：
影响因子：
--
通讯作者：
Mazer JA
中科院分区：
文献类型：
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作者：
Golomb JD;Chun MM;Mazer JA
通过对行为相关位置的隐蔽注意可以促进视觉处理。如果在视野中的某个位置被促进时眼睛移动，那么所关注位置的内部表示会发生什么？随着每次眼球运动，所关注位置的视网膜主题（以眼睛为中心）坐标会发生变化，而空间主题（以世界为中心）坐标保持稳定。为了研究空间注意力的神经基础是否存在于视网膜局部和/或空间局部组织图中，我们利用了一种新颖的注视相关行为范式，该范式在眼球运动后的不同时间探测空间注意力。当任务要求需要在眼球运动后维持空间主题表征时，我们发现在扫视后 100-200 毫秒内空间线索的视网膜主题位置有促进作用，尽管该位置没有行为意义。这种与任务无关的视网膜专题表征在眼跳之后立即占主导地位，而在稍后的延迟中，与任务相关的空间专题表征占主导地位。另一方面，当任务要求需要维持视网膜专题坐标中的提示时，强烈的视网膜专题益处在扫视后持续很长时间，并且没有空间专题促进的证据。这些数据表明，空间注意力的皮层和皮层下基质主要存在于视网膜局部组织图中，当行为需求需要注意力的空间局部表示时，必须动态更新这些地图以补偿眼球运动。我们的结论是，视觉系统对内源性维持的空间注意力的本机或低级表示是视网膜专题，并且注意力到空间专题坐标的重新映射发生得很慢，并且仅在行为上必要时才发生。
Visual processing can be facilitated by covert attention at behaviorally relevant locations. If the eyes move while a location in the visual field is facilitated, what happens to the internal representation of the attended location? With each eye movement, the retinotopic (eye-centered) coordinates of the attended location change while the spatiotopic (world-centered) coordinates remain stable. To investigate whether the neural substrates of spatial attention reside in retinotopically- and/or spatiotopically-organized maps, we utilized a novel gaze-contingent behavioral paradigm that probed spatial attention at various times after eye movements. When task demands required maintaining a spatiotopic representation after the eye movement, we found facilitation at the retinotopic location of the spatial cue for 100-200ms following the saccade, although this location had no behavioral significance. This task-irrelevant retinotopic representation dominated immediately after the saccade, whereas at later delays the task-relevant spatiotopic representation prevailed. On the other hand, when task demands required maintaining the cue in retinotopic coordinates, a strong retinotopic benefit persisted long after the saccade, and there was no evidence of spatiotopic facilitation. These data suggest that the cortical and sub-cortical substrates of spatial attention primarily reside in retinotopically-organized maps that must be dynamically updated to compensate for eye movements when behavioral demands require a spatiotopic representation of attention. Our conclusion is that the visual system’s native or low-level representation of endogenously maintained spatial attention is retinotopic, and remapping of attention to spatiotopic coordinates occurs slowly and only when behaviorally necessary.