Avoidance of predators or impending collisions is important for survival. Approaching objects can be mimicked by expanding flow-fields. Tethered flying fruit flies, when confronted with an expansion flow-field, reliably turn away from the pole of expansion when presented laterally, or perform a landing response when presented frontally. Here, we show that the response to an expansion flow-field is independent of the overall luminance change and edge acceleration. As we demonstrate by blocking local motion-sensing neurons T4 and T5, the response depends crucially on the neural computation of appropriately aligned local motion vectors, using the same hardware that also controls the optomotor response to rotational flow-fields. s
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机译：避免掠食者或即将发生的碰撞对于生存至关重要。通过扩大流场可以模仿接近的物体。被束缚的果蝇在面对扩展流场时，在侧向呈现时会可靠地远离扩展极点，或者在正向呈现时会执行着陆响应。在这里，我们表明对膨胀流场的响应与整体亮度变化和边缘加速度无关。正如我们通过阻止局部运动感应神经元T4和T5所证明的那样，响应使用与控制旋转流场的光电机响应相同的硬件，关键取决于适当对齐的局部运动矢量的神经计算。 s
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