The world from a cat's perspective -: statistics of natural videos
The world from a cat's perspective -: statistics of natural videos
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DOI：
10.1007/s00422-003-0434-6
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发表时间：
2004-01-01
影响因子：
1.9
通讯作者：
König, P
中科院分区：
文献类型：
--
作者：
Betsch, BY;Einhäuser, W;König, P
哺乳动物的视觉系统是研究最深入的感觉系统之一。然而，我们对它所操作的典型输入的了解却非常有限。为了解决这个问题，我们试图了解自然的视觉环境和世界所看到的猫。与CCD相机连接到他们的头，猫探索几个户外环境和视频的自然刺激是从动物的角度记录。这些视频的统计分析揭示了几个显着的特性。首先，我们发现一个各向异性的定向轮廓与水平方向的增强发生，前面描述的“倾斜效应”作为两个主要方向的优势。其次，对比度在图像的中心没有升高，这表明与人类相比，固定点选择的机制不同。第三，分析一系列图像，我们发现轮廓的精确位置变化快于它们的方向。最后，共线轮廓优于平行移位轮廓，匹配最近的生理和解剖结果。这些发现证明了自然视觉刺激的丰富结构及其与广泛研究的解剖学和生理学问题的直接关系。
The mammalian visual system is one of the most intensively investigated sensory systems. However, our knowledge of the typical input it is operating on is surprisingly limited. To address this issue, we seek to learn about the natural visual environment and the world as seen by a cat. With a CCD camera attached to their head, cats explore several outdoor environments and videos of natural stimuli are recorded from the animals' perspective. The statistical analysis of these videos reveals several remarkable properties. First, we find an anisotropy of oriented contours with an enhanced occurrence of horizontal orientations, earlier described in the "oblique effect" as a predominance of the two cardinal orientations. Second, contrast is not elevated in the center of the images, suggesting different mechanisms of fixation point selection as compared to humans. Third, analyzing a sequence of images we find that the precise position of contours varies faster than their orientation. Finally, collinear contours prevail over parallel shifted contours, matching recent physiological and anatomical results. These findings demonstrate the rich structure of natural visual stimuli and its direct relation to extensively studied anatomical and physiological issues.