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首页> 外文期刊>Journal of Neurophysiology >A looming-sensitive pathway responds to changes in the trajectory of object motion
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A looming-sensitive pathway responds to changes in the trajectory of object motion

机译：迫在眉睫的敏感途径响应对象运动轨迹的变化

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摘要

Two identified locust neurons, the lobula giant movement detector (LGMD) and its postsynaptic partner, the descending contralateral movement detector (DCMD), constitute one motion-sensitive pathway in the visual system that responds preferentially to objects that approach on a direct collision course and are implicated in collision-avoidance behavior. Previously described responses to the approach of paired objects and approaches at different time intervals (Guest BB, Gray JR. J Neurophysiol 95: 1428-1441, 2006) suggest that this pathway may also be affected by more complicated movements in the locust's visual environment. To test this possibility we presented stationary locusts with disks traveling along combinations of colliding (looming), noncolliding (translatory), and near-miss trajectories. Distinctly different responses to different trajectories and trajectory changes demonstrate that DCMD responds to complex aspects of local visual motion. DCMD peak firing rates associated with the time of collision remained relatively invariant after a trajectory change from translation to looming. Translatory motion initiated in the frontal visual field generated a larger peak firing rate relative to object motion initiated in the posterior visual field, and the peak varied with simulated distance from the eye. Transition from translation to looming produced a transient decrease in the firing rate, whereas transition away from looming produced a transient increase. The change in firing rate at the time of transition was strongly correlated with unique expansion parameters described by the instantaneous angular acceleration of the leading edge and subtense angle of the disk. However, response time remained invariant. While these results may reflect low spatial resolution of the compound eye, they also suggest that this motionsensitive pathway may be capable of monitoring dynamic expansion properties of objects that change the trajectory of motion. ? 2012 the American Physiological Society.
机译：两个鉴定的蝗虫神经元，叶片巨型运动探测器（LGMD）及其后腹部伴侣，下降的对侧运动探测器（DCMD）构成了视觉系统中的一个运动敏感途径，其优先对对象进行直接碰撞过程和涉及碰撞避免行为。以前描述了对不同时间间隔的配对对象的方法的响应（Guest虚拟机BB，灰色JR。J Neurophysiol 95：1428-1441,2006）表明该途径也可能受到蝗虫的视觉环境中更复杂的运动的影响。为了测试这种可能性，我们向沿着碰撞（迫在眉睫），非卷积（译文）和近乎轨迹的组合提供了带有磁盘的固定蝗虫。对不同轨迹和轨迹变化的明显不同的响应表明DCMD响应了本地视觉运动的复杂方面。在从转换到迫在眉睫的轨迹变化后，与碰撞时间相关联的DCMD峰值触发速率仍然不变。在正视场中发起的平移运动相对于在后视场中发起的对象运动产生较大的峰触发速率，并且峰值随着距离眼睛的模拟距离而变化。从翻译到迫在眉睫的过渡产生了射击率的瞬态减少，而远离迫在眉睫的过渡产生瞬态增加。转换时的射击率的变化与通过磁盘的前缘和子密键角的瞬时角度加速来描述的独特的扩展参数强烈相关。但是，响应时间仍然不变。虽然这些结果可以反映复合眼的低空间分辨率，但是它们还表明该运动途径可以监测改变运动轨迹的物体的动态膨胀性能。还是2012年美国生理社会。

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