Gaze Strategy in the Free Flying Zebra Finch (Taeniopygia guttata)
Gaze Strategy in the Free Flying Zebra Finch (Taeniopygia guttata)
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DOI：
10.1371/journal.pone.0003956
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发表时间：
2008-12-24
期刊：
影响因子：
3.7
通讯作者：
Bischof, Hans-Joachim
中科院分区：
文献类型：
--
作者：
Eckmeier, Dennis;Geurten, Bart R. H.;Bischof, Hans-Joachim
快速移动的动物依赖于来自视网膜上的视觉流的线索。来自平移运动的光流包括关于环境的三维组成的信息，而在旋转自运动期间经历的光流不包括。因此，在运动期间将旋转与平移运动分离的扫视凝视策略将促进从视觉输入提取空间信息。我们分析了鸟类是否使用这样的策略，高速视频记录斑胸草雀从两个方向在避障任务。检查记录的每个帧以导出喙在三维空间中的位置和方向。数据显示，在所有的飞行中，头部方向以扫视的方式移动，并且在扫视之间保持笔直。因此，鸟类使用在平移期间主动稳定它们的凝视的凝视策略来简化基于光流的导航。这是鸟类在飞行过程中主动优化光流的第一个证据。
Fast moving animals depend on cues derived from the optic flow on their retina. Optic flow from translational locomotion includes information about the three-dimensional composition of the environment, while optic flow experienced during a rotational self motion does not. Thus, a saccadic gaze strategy that segregates rotations from translational movements during locomotion will facilitate extraction of spatial information from the visual input. We analysed whether birds use such a strategy by highspeed video recording zebra finches from two directions during an obstacle avoidance task. Each frame of the recording was examined to derive position and orientation of the beak in three-dimensional space. The data show that in all flights the head orientation was shifted in a saccadic fashion and was kept straight between saccades. Therefore, birds use a gaze strategy that actively stabilizes their gaze during translation to simplify optic flow based navigation. This is the first evidence of birds actively optimizing optic flow during flight.