The spatial, temporal and contrast properties of expansion and rotation flight optomotor responses in Drosophila
The spatial, temporal and contrast properties of expansion and rotation flight optomotor responses in Drosophila
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DOI：
10.1242/jeb.007807
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发表时间：
2007-09-15
影响因子：
2.8
通讯作者：
Frye, Mark A.
中科院分区：
文献类型：
--
作者：
Duistermars, Brian J.;Chow, Dawnis M.;Frye, Mark A.
果蝇对视觉扩张的全景视网膜模式做出反应，通过远离扩张焦点的稳健转向动作来避免碰撞并保持逆风飞行姿势。全景旋转引起相对较弱的同向转向操作，这也保持了视觉稳定性。全场光流模式（如扩展和旋转）是由不同的飞行动作引起的，例如直线飞行期间的身体平移或悬停期间的身体旋转。最近的分析表明，在某些实验条件下，旋转光电机响应反映了不同膨胀响应分量的线性和。扩张和旋转介导的视觉稳定反应是单个视运动反应的一部分，受两个流场不同刺激的神经回路的影响，还是这两种行为反应反映了两种不同的控制系统？在神经回路的特性在其介导的行为中揭示这一原则的指导下，我们系统地改变了扩张和旋转刺激的空间、时间和对比度特性，并量化了系留飞行期间视运动反应的时间过程和幅度。我们的结果支持这样的结论：扩张和旋转视运动反应确实是两种独立的反射，它们来自相同的基本运动探测器系统，但很可能是由具有不同空间积分特性、低通特性和对比灵敏度的独立前运动电路介导的。
Fruit flies respond to panoramic retinal patterns of visual expansion with robust steering maneuvers directed away from the focus of expansion to avoid collisions and maintain an upwind flight posture. Panoramic rotation elicits comparatively weak syndirectional steering maneuvers, which also maintain visual stability. Full-field optic flow patterns like expansion and rotation are elicited by distinct flight maneuvers such as body translation during straight flight or body rotation during hovering, respectively. Recent analyses suggest that under some experimental conditions the rotation optomotor response reflects the linear sum of different expansion response components. Are expansion and rotation-mediated visual stabilization responses part of a single optomotor response subserved by a neural circuit that is differentially stimulated by the two flow fields, or rather do the two behavioral responses reflect two distinct control systems? Guided by the principle that the properties of neural circuits are revealed in the behaviors they mediate, we systematically varied the spatial, temporal and contrast properties of expansion and rotation stimuli, and quantified the time course and amplitude of optomotor responses during tethered flight. Our results support the conclusion that expansion and rotation optomotor responses are indeed two separate reflexes, which draw from the same system of elementary motion detectors, but are likely mediated by separate pre-motor circuits having different spatial integration properties, low-pass characteristics and contrast sensitivity.