The Dominant Role of Visual Motion Cues in Bumblebee Flight Control Revealed Through Virtual Reality
The Dominant Role of Visual Motion Cues in Bumblebee Flight Control Revealed Through Virtual Reality
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DOI：
10.3389/fphys.2018.01038
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发表时间：
2018-07-31
影响因子：
4
通讯作者：
Stewart, Finlay J.
中科院分区：
文献类型：
--
作者：
Frasnelli, Elisa;de Ibarra, Natalie Hempel;Stewart, Finlay J.
飞蜂广泛使用光流，光流是由它们自己的运动在视觉场景中产生的明显运动。关于蜜蜂视觉引导飞行的许多已知知识来自于使用真实物理物体的实验，这限制了可以呈现的线索的类型。在这里，我们实现了一个虚拟现实系统，允许我们在3D空间中创建对象的视觉错觉。我们训练大黄蜂，熊蜂，从展示在飞行竞技场地板上的静态目标进食，然后观察它们对各种插入的虚拟物体的反应。当虚拟地板被呈现在物理地板上方时，蜜蜂不愿穿过它，这表明它们认为虚拟地板是真实的表面。为了到达地面上的目标，他们飞越了地面上虚拟表面的一个洞，并绕过了一个升高的虚拟平台，尽管没有因为避开虚拟障碍物而获得任何奖励。即使当目标通过障碍物(不真实地)可见时，这些行为仍然存在。最后，我们用物理上不可能的模棱两可的刺激来挑战蜜蜂，这些刺激给出了相互冲突的运动和遮挡线索。在这种情况下，它们的行为与运动信息一致，似乎忽略了遮挡。
Flying bees make extensive use of optic flow the apparent motion in the visual scene generated by their own movement. Much of what is known about bees' visually-guided flight comes from experiments employing real physical objects, which constrains the types of cues that can be presented. Here we implement a virtual reality system allowing us to create the visual illusion of objects in 3D space. We trained bumblebees, Bombus ignitus, to feed from a static target displayed on the floor of a flight arena, and then observed their responses to various interposing virtual objects. When a virtual floor was presented above the physical floor, bees were reluctant to descend through it, indicating that they perceived the virtual floor as a real surface. To reach a target at ground level, they flew through a hole in a virtual surface above the ground, and around an elevated virtual platform, despite receiving no reward for avoiding the virtual obstacles. These behaviors persisted even when the target was made (unrealistically) visible through the obstructing object. Finally, we challenged the bees with physically impossible ambiguous stimuli, which give conflicting motion and occlusion cues. In such cases, they behaved in accordance with the motion information, seemingly ignoring occlusion.