Activity of descending contralateral movement detector neurons and collision avoidance behaviour in response to head-on visual stimuli in locusts.

J R Gray, J K Lee, R M Robertson
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引用次数: 86

Abstract

We recorded the activity of the right and left descending contralateral movement detectors responding to 10-cm (small) or 20-cm (large) computer-generated spheres approaching along different trajectories in the locust's frontal field of view. In separate experiments we examined the steering responses of tethered flying locusts to identical stimuli. The descending contralateral movement detectors were more sensitive to variations in target trajectory in the horizontal plane than in the vertical plane. Descending contralateral movement detector activity was related to target trajectory and to target size and was most sensitive to small objects converging on a direct collision course from above and to one side. Small objects failed to induce collision avoidance manoeuvres whereas large objects produced reliable collision avoidance responses. Large targets approaching along a converging trajectory produced steering responses that were either away from or toward the side of approach of the object, whereas targets approaching along trajectories that were offset from the locust's mid-longitudinal body axis primarily evoked responses away from the target. We detected no differences in the discharge properties of the descending contralateral movement detector pair that could account for the different collision avoidance behaviours evoked by varying the target size and trajectories. We suggest that descending contralateral movement detector properties are better suited to predator evasion than collision avoidance.

蝗虫对正面视觉刺激的下行对侧运动探测神经元活动与避碰行为。
我们记录了左右下降对侧运动探测器的活动,它们对计算机生成的10厘米(小)或20厘米(大)球体沿着蝗虫正面视野中不同的轨迹接近的反应。在不同的实验中,我们研究了拴着飞行的蝗虫对相同刺激的转向反应。下降对侧运动检测器对目标轨迹在水平面上的变化比在垂直平面上的变化更敏感。下降对侧运动检测器活动与目标轨迹和目标大小有关,对从上方和一侧聚集在直接碰撞路线上的小物体最敏感。小物体不能诱导避碰机动,而大物体产生可靠的避碰反应。沿着收敛轨迹接近的大目标产生的转向反应要么远离目标接近的一侧,要么朝向目标接近的一侧,而沿着偏离蝗虫中纵向身体轴的轨迹接近的目标主要引起远离目标的反应。我们检测到下行对侧运动检测器对的放电特性没有差异,这可以解释不同目标大小和轨迹所引起的不同避碰行为。我们认为下降对侧运动检测器的特性更适合于捕食者逃避而不是碰撞避免。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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