Impact of stride-coupled gaze shifts of walking blowflies on the neuronal representation of visual targets
Impact of stride-coupled gaze shifts of walking blowflies on the neuronal representation of visual targets
复制标题
行走苍蝇的步幅耦合目光转移对视觉目标神经元表征的影响
DOI：
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发表时间：
2014
影响因子：
3
通讯作者：
M. Egelhaaf
中科院分区：
文献类型：
--
作者：
D. Kress;M. Egelhaaf
在运动过程中，动物严重依赖从环境中获得的视觉线索来指导它们的行为。例子是基本的行为，如避免碰撞或接近目标。苍蝇的扫视凝视策略，它分离的平移和旋转阶段的运动，已被建议，以促进提取的环境信息，因为只有图像流诱发的平移自运动包含有关周围世界的距离信息。与视线方向基本保持恒定的飞行平移阶段相反，行走的苍蝇经历了与其步幅周期相关联的连续旋转图像流。这些自发的图像偏移对环境信息提取的影响尚不清楚。为了评估步幅耦合图像移位对视觉信息处理的影响，我们进行了HSE细胞的电生理记录，HSE细胞是绿头苍蝇视觉系统中的运动敏感宽视野神经元。该细胞在调节视运动行为、自我运动估计和空间信息处理中起着关键作用。我们使用的视觉刺激是基于步行绿头苍蝇，而接近一个黑色的竖条所经历的视觉输入。HSE对这些刺激的反应主要由周期性膜电位波动引起的步幅耦合图像移位。然而，在接近过程中，细胞的反应包含了关于酒吧及其背景的信息。由酒吧引起的响应分量大于其背景的响应，特别是在接近的最后阶段。然而，正如行走过程中视觉输入的有针对性的修改所揭示的那样，基于HSE响应的距离信息的提取受到步幅耦合视网膜图像移位的严重损害。可能的机制，可以科普这些步幅耦合响应进行了讨论。
During locomotion animals rely heavily on visual cues gained from the environment to guide their behavior. Examples are basic behaviors like collision avoidance or the approach to a goal. The saccadic gaze strategy of flying flies, which separates translational from rotational phases of locomotion, has been suggested to facilitate the extraction of environmental information, because only image flow evoked by translational self-motion contains relevant distance information about the surrounding world. In contrast to the translational phases of flight during which gaze direction is kept largely constant, walking flies experience continuous rotational image flow that is coupled to their stride-cycle. The consequences of these self-produced image shifts for the extraction of environmental information are still unclear. To assess the impact of stride-coupled image shifts on visual information processing, we performed electrophysiological recordings from the HSE cell, a motion sensitive wide-field neuron in the blowfly visual system. This cell has been concluded to play a key role in mediating optomotor behavior, self-motion estimation and spatial information processing. We used visual stimuli that were based on the visual input experienced by walking blowflies while approaching a black vertical bar. The response of HSE to these stimuli was dominated by periodic membrane potential fluctuations evoked by stride-coupled image shifts. Nevertheless, during the approach the cell’s response contained information about the bar and its background. The response components evoked by the bar were larger than the responses to its background, especially during the last phase of the approach. However, as revealed by targeted modifications of the visual input during walking, the extraction of distance information on the basis of HSE responses is much impaired by stride-coupled retinal image shifts. Possible mechanisms that may cope with these stride-coupled responses are discussed.
影响因子：
64.8
作者：
Maisak, Matthew S.;Haag, Juergen;Borst, Alexander
通讯作者：
Borst, Alexander
影响因子：
25
作者：
Bahl, Armin;Ammer, Georg;Borst, Alexander
通讯作者：
Borst, Alexander
影响因子：
3
作者：
Rien D;Kern R;Kurtz R
通讯作者：
Kurtz R