Optic Flow Cues Guide Flight in Birds
Optic Flow Cues Guide Flight in Birds
复制标题
DOI：
10.1016/j.cub.2011.09.009
复制
发表时间：
2011-11-08
期刊：
影响因子：
9.2
通讯作者：
Srinivasan, Mandyam V.
中科院分区：
文献类型：
--
作者：
Bhagavatula, Partha S.;Claudianos, Charles;Srinivasan, Mandyam V.
尽管人们投入了大量精力来研究鸟类如何长距离迁徙，但令人惊讶的是，人们对它们如何成功应对在杂乱环境中快速飞行的即时挑战却知之甚少[1]。有人认为，鸟类通过使用飞行过程中眼睛产生的图像运动所产生的线索来检测和避开障碍物 [2] 并控制着陆机动 [3-5]。在这里，我们通过在墙壁装饰有各种视觉图案的走廊中拍摄虎皮鹦鹉飞行过程中的轨迹来研究虎皮鹦鹉以无碰撞的方式飞过狭窄通道的能力。结果首次明确地表明，鸟类通过平衡两只眼睛所经历的图像运动的速度来安全地通过狭窄的间隙，并且通过监测两只眼睛所经历的图像运动的速度来调节飞行速度。这些发现与之前报道的飞行昆虫的发现非常相似[6-13]，这表明视觉引导的一些原则可能是所有昼夜飞行动物所共有的。
Although considerable effort has been devoted to investigating how birds migrate over large distances, surprisingly little is known about how they tackle so successfully the moment-to-moment challenges of rapid flight through cluttered environments [1]. It has been suggested that birds detect and avoid obstacles [2] and control landing maneuvers [3-5] by using cues derived from the image motion that is generated in the eyes during flight. Here we investigate the ability of budgerigars to fly through narrow passages in a collision-free manner, by filming their trajectories during flight in a corridor where the walls are decorated with various visual patterns. The results demonstrate, unequivocally and for the first time, that birds negotiate narrow gaps safely by balancing the speeds of image motion that are experienced by the two eyes and that the speed of flight is regulated by monitoring the speed of image motion that is experienced by the two eyes. These findings have close parallels with those previously reported for flying insects [6-13], suggesting that some principles of visual guidance may be shared by all diurnal, flying animals.