Image structure at the center of gaze during free viewing
Image structure at the center of gaze during free viewing
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DOI：
10.1162/jocn.2006.18.5.737
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发表时间：
2006-05-01
影响因子：
3.2
通讯作者：
Sur, M
中科院分区：
文献类型：
--
作者：
Dragoi, V;Sur, M
一般认为，视觉系统适应于视觉世界的统计。测量和理解这些统计数据需要对图像扫描过程中到达中央凹的信号结构有精确的了解。然而，尽管眼球运动导致视网膜刺激在一秒钟内发生多次变化，但它隐含地假设在自然观看过程中图像是均匀采样的。通过分析3只自由观看自然场景的恒河猴的眼球运动，我们发现凝视中心的刺激统计具有显著的各向异性。我们发现，在注视一个图像斑块之后，更有可能对附近具有相似方向结构的斑块进行扫视，或者对更远的具有很大不同方向结构的斑块进行扫视。此外，我们发现初级视觉皮层（VI）中的定向选择神经元可以利用眼动统计来选择性地提高其识别性能。
it is generally believed that the visual system is adapted to the statistics of the visual world. Measuring and understanding these statistics require precise knowledge of the structure of the signals reaching fovea during image scanning. However, despite the fact that eye movements cause retinal stimulation to change several times in a second, it is implicitly assumed that images are sampled uniformly during natural viewing. By analyzing the eye movements of three rhesus monkeys freely viewing natural scenes, we report here significant anisotropy in stimulus statistics at the center of gaze. We find that fixation on an image patch is more likely to be followed by a saccade to a nearby patch of similar orientation structure or by a saccade to a more distant patch of largely dissimilar orientation structure. Furthermore, we show that orientation-selective neurons in the primary visual cortex (VI) can take advantage of eye movement statistics to selectively improve their discrimination performance.