Mechanisms of stick insect locomotion in a gap-crossing paradigm
Mechanisms of stick insect locomotion in a gap-crossing paradigm
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DOI：
10.1007/s00359-003-0482-3
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发表时间：
2004-03-01
影响因子：
2.1
通讯作者：
Cruse, H
中科院分区：
文献类型：
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作者：
Bläsing, B;Cruse, H
竹节虫爬过其步长两倍以上的空隙的运动已被证明是研究运动行为如何适应外部条件的有用范例。本研究分析了跨间隙序列中单步的摆动幅度和极端位置，并将其与无干扰行走的相应参数进行了比较。我们表明，基本机制的适应涉及单腿的运动以及腿之间的协调。站立速度的减慢、伸直时腿的搜索动作和短步的产生是跨沟任务的重要前提。竹节虫行走的腿部协调规则似乎被修改了，支撑腿上的负荷被认为对协调有主要影响，特别是在慢速行走中。前腿跨入缺口，触角接触缺口的远端，这两种情况都会影响后续的腿部运动，而触角“不接触”似乎不包含信息。将这些结果整合到步行控制器的模型中可以提高我们对高度不规则环境中昆虫运动的理解。
Locomotion of stick insects climbing over gaps of more than twice their step length has proved to be a useful paradigm to investigate how locomotor behaviour is adapted to external conditions. In this study, swing amplitudes and extreme positions of single steps from gap-crossing sequences have been analysed and compared to corresponding parameters of undisturbed walking. We show that adaptations of the basic mechanisms concern movements of single legs as well as the coordination between the legs. Slowing down of stance velocity, searching movements of legs in protraction and the generation of short steps are crucial prerequisites in the gap-crossing task. The rules of leg coordination described for stick insect walking seem to be modified, and load on the supporting legs is assumed to have a major effect on coordination especially in slow walking. Stepping into the gap with a front leg and antennal contact with the far edge of the gap provide information, as both events influence the following leg movements, whereas antennal "non-contact" seems not to contain information. Integration of these results into the model of the walking controller can improve our understanding of insect locomotion in highly irregular environments.