Flies land upside down on a ceiling using rapid visually mediated rotational maneuvers
Flies land upside down on a ceiling using rapid visually mediated rotational maneuvers
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DOI：
10.1126/sciadv.aax1877
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发表时间：
2019-10-01
期刊：
影响因子：
13.6
通讯作者：
Cheng, Bo
中科院分区：
文献类型：
--
作者：
Liu, Pan;Sane, Sanjay P.;Cheng, Bo
苍蝇和其他昆虫通常会倒着落在天花板上。这些倒立着陆动作是最引人注目的特技飞行表演之一，但这些行为的全部范围及其潜在的感觉运动过程在很大程度上仍然未知。在这里，我们报告说，成功的苍蝇倒立着陆涉及一系列协调良好的行为模块，包括一个初始的向上加速，然后快速旋转身体和腿部伸展，然后终止与腿辅助身体摆动围绕腿牢固地连接到天花板。统计分析表明，当果蝇的相对视网膜扩张速度达到一个阈值时，就会触发旋转动作。此外，苍蝇表现出高度可变的俯仰和滚动率，这是强烈相关的，并可能介导的多种感官线索。当以更高的向前或更低的向上速度飞行时，苍蝇会降低俯仰速率，但会增加腿辅助摆动的程度，从而利用身体线性动量的传递。
Flies and other insects routinely land upside down on a ceiling. These inverted landing maneuvers are among the most remarkable aerobatic feats, yet the full range of these behaviors and their underlying sensorimotor processes remain largely unknown. Here, we report that successful inverted landing in flies involves a serial sequence of well-coordinated behavioral modules, consisting of an initial upward acceleration followed by rapid body rotation and leg extension, before terminating with a leg-assisted body swing pivoted around legs firmly attached to the ceiling. Statistical analyses suggest that rotational maneuvers are triggered when flies' relative retinal expansion velocity reaches a threshold. Also, flies exhibit highly variable pitch and roll rates, which are strongly correlated to and likely mediated by multiple sensory cues. When flying with higher forward or lower upward velocities, flies decrease the pitch rate but increase the degree of leg-assisted swing, thereby leveraging the transfer of body linear momentum.