Optomotor steering and flight control requires a specific subsection of the compound eye in the hawkmoth, Manduca sexta
Optomotor steering and flight control requires a specific subsection of the compound eye in the hawkmoth, Manduca sexta
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DOI：
10.1242/jeb.178210
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发表时间：
2018-11-01
影响因子：
2.8
通讯作者：
Willis, Mark A.
中科院分区：
文献类型：
--
作者：
Copley, Sean;Parthasarathy, Kalyanasundaram;Willis, Mark A.
在追踪气味羽流时，雄性天蛾使用光流线索来稳定它们相对于环境的飞行运动。我们研究了自由飞行的飞蛾跟踪气味羽流在实验室风洞和系留的飞蛾在optomotor飞行模拟器的反应，以确定关键的光流线索检测复眼上的位置。在这些行为实验中，我们封闭了复眼的特定区域，并系统地检查了飞蛾在光流处理中的特定缺陷的行为。自由飞行的蛾与背面的复眼画不能保持稳定的飞行和跟踪风传播的气味羽。然而，蛾的羽跟踪性能与其复眼的腹侧的一半画是相同的未画的控制。在一组匹配的实验中。我们呈现了具有移动的垂直定向的正弦光栅的栓系蛾，并且发现其眼睛未被涂抹、腹侧被涂抹和中间被涂抹的个体都通过尝试以相同比例的光学马达驱动的转动来响应。相反，复眼背侧着色、侧侧着色和完全着色的个体没有视觉运动转向反应。我们降低了视觉刺激的对比度，发现这种关系在对比度为2.5%时是一致的。我们的结论是，从蛾的视觉世界的背外侧区域的视觉输入是成功维持飞行稳定性的关键，这个物种的视觉环境必须达到或超过2.5%的对比度，以支持视觉飞行控制。
While tracking odor plumes, male hawkmoths use optic flow cues to stabilize their flight movements with respect to their environment. We studied the responses of freely flying moths tracking odor plumes in a laboratory wind tunnel and tethered moths in an optomotor flight simulator to determine the locations on the compound eye on which critical optic flow cues are detected. In these behavioral experiments, we occluded specific regions of the compound eye and systematically examined the moths' behavior for specific deficits in optic flow processing. Freely flying moths with the dorsal half of the compound eye painted were unable to maintain stable flight and track the wind-borne odor plume. However, the plume tracking performance of moths with the ventral half of their compound eyes painted was the same as unpainted controls. In a matched set of experiments. we presented tethered moths with moving vertically oriented sinusoidal gratings and found that individuals with their eyes unpainted, ventrally painted and medially painted all responded by attempting optomotor-driven turns in the same proportion. In contrast, individuals with their compound eyes dorsally painted, laterally painted and completely painted showed no optomotor turning response. We decreased the contrast of the visual stimulus and found that this relationship was consistent down to a contrast level of 2.5%. We conclude that visual input from the dorso-lateral region of the moth's visual world is critical for successful maintenance of flight stability and that this species' visual environment must meet or exceed a contrast ratio of 2.5% to support visual flight control.