Blowfly flight characteristics are shaped by environmental features and controlled by optic flow information
Blowfly flight characteristics are shaped by environmental features and controlled by optic flow information
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DOI：
10.1242/jeb.061713
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发表时间：
2012-07-01
影响因子：
2.8
通讯作者：
Egelhaaf, Martin
中科院分区：
文献类型：
--
作者：
Kern, Roland;Boeddeker, Norbert;Egelhaaf, Martin
苍蝇的飞行由两个主要组成部分组成，跳转和大部分笔直注视方向的间隔，尽管由于惯性，飞行轨迹通常会平稳地改变方向。我们研究了飞行行为是如何根据周围环境而变化的，以及在有和没有障碍物的不同宽度的竞技场中如何控制跳跃转弯和跳跃间平移运动。苍蝇不会沿直线飞行，即使在穿越直线飞行竞技场时也是如此；相反，它们沿着蜿蜒的轨迹飞行。飞行速度和弯曲幅度随竞技场宽度的增加而增加。虽然扫视的持续时间基本上是恒定的，但峰值角速度和向任何方向的连续性是可变的，并取决于视觉环境。眼跳速率和振幅也随竞技场布局而变化，并与与竞技场壁的“接触时间”相关。我们提供的证据表明，眼跳和速度控制在很大程度上依赖于眼区域产生的眼间光流，而不是在横向视野中产生的，至少在向前飞行时，横向视野的光流往往是最强的。
Blowfly flight consists of two main components, saccadic turns and intervals of mostly straight gaze direction, although, as a consequence of inertia, flight trajectories usually change direction smoothly. We investigated how flight behavior changes depending on the surroundings and how saccadic turns and intersaccadic translational movements might be controlled in arenas of different width with and without obstacles. Blowflies do not fly in straight trajectories, even when traversing straight flight arenas; rather, they fly in meandering trajectories. Flight speed and the amplitude of meanders increase with arena width. Although saccade duration is largely constant, peak angular velocity and succession into either direction are variable and depend on the visual surroundings. Saccade rate and amplitude also vary with arena layout and are correlated with the 'time-to-contact' to the arena wall. We provide evidence that both saccade and velocity control rely to a large extent on the intersaccadic optic flow generated in eye regions looking well in front of the fly, rather than in the lateral visual field, where the optic flow at least during forward flight tends to be strongest.