Stabilizing responses to sideslip disturbances in Drosophila melanogaster are modulated by the density of moving elements on the ground
Stabilizing responses to sideslip disturbances in Drosophila melanogaster are modulated by the density of moving elements on the ground
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DOI：
10.1098/rsbl.2020.0748
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发表时间：
2021-03-03
期刊：
影响因子：
3.3
通讯作者：
Theobald, Jamie C.
中科院分区：
文献类型：
--
作者：
Ruiz, Carlos;Theobald, Jamie C.
稳定对侧滑干扰的响应是果蝇飞行控制系统的关键部分。虽然很大程度上是由机械感受介导的，但最终的反应大部分是由与视觉相关的广域运动检测系统产生的。为了有效，这些响应必须与它们要纠正的干扰相匹配。为此，果蝇必须估计干扰的速度，尽管尚不清楚它们在呈现自然图像或点场时如何完成此任务。最近的发现是，点场中的运动视差只有在苍蝇下方被感知时才能调节稳定响应，这提出了一个问题：其他图像统计数据在眼睛区域之间是否也有不同的处理方式。其中一个参数是平移光流中移动的元素的密度。根据栖息地的不同，提供有关苍蝇上方和下方自我运动信息的元素密度可能存在很大差异，这反过来又可能充当选择性压力，调整视觉系统以在区域基础上处理该参数。通过呈现不同密度的横向移动点场，我们发现，在果蝇中，稳定响应的幅度受到视场中元素数量的显着影响。苍蝇在相对较低且较窄的元素密度范围内强烈反向转向。但这种效应是眼睛腹侧区域所独有的，而无论流动中元素的密度如何，背侧刺激都会引起不变的刻板反应。这凸显了眼睛的局部专业化，并表明下部区域可能在平移飞行稳定中发挥更关键的作用。
Stabilizing responses to sideslip disturbances are a critical part of the flight control system in flies. While strongly mediated by mechanoreception, much of the final response results from the wide-field motion detection system associated with vision. In order to be effective, these responses must match the disturbance they are aimed to correct. To do this, flies must estimate the velocity of the disturbance, although it is not known how they accomplish this task when presented with natural images or dot fields. The recent finding, that motion parallax in dot fields can modulate stabilizing responses only if perceived below the fly, raises the question of whether other image statistics are also processed differently between eye regions. One such parameter is the density of elements moving in translational optic flow. Depending on the habitat, there might be strong differences in the density of elements providing information about self-motion above and below the fly, which in turn could act as selective pressures tuning the visual system to process this parameter on a regional basis. By presenting laterally moving dot fields of different densities we found that, in Drosophila melanogaster, the amplitude of the stabilizing response is significantly affected by the number of elements in the field of view. Flies countersteer strongly within a relatively low and narrow range of element densities. But this effect is exclusive to the ventral region of the eye, and dorsal stimuli elicit an unaltered and stereotypical response regardless of the density of elements in the flow. This highlights local specialization of the eye and suggests the lower region may play a more critical role in translational flight stabilization.