C.刻板行为的出现与C. elegans
The emergence of stereotyped behaviors in C. elegans
摘要：
动物的行为有时可以分解成离散的、定型的元素。在一个模型中，这种行为是由特定的命令触发的;在极端的情况下，行为的离散性可以追溯到单个命令神经元中动作电位的离散性。我们利用线虫C.优雅的探索相反的极端，其中离散和刻板出现从整个行为的动态。一个简单的随机模型蠕虫的不断变化的身体形状在爬行有吸引力对应的向前和向后运动，这些吸引力之间的噪声驱动的过渡对应于突然逆转。我们发现，没有自由参数，该模型产生的逆转率误差酒吧内观察到的实验，和相对刻板的轨迹附近的逆转也被正确预测。
英文摘要：
Animal behaviors are sometimes decomposable into discrete, stereotyped elements. In one model, such behaviors are triggered by specific commands; in the extreme case, the discreteness of behavior is traced to the discreteness of action potentials in the individual command neurons. We use the crawling behavior of the nematode C. elegans to explore the opposite extreme, in which discreteness and stereotypy emerges from the dynamics of the entire behavior. A simple stochastic model for the worm's continuously changing body shape during crawling has attractors corresponding to forward and backward motion; noise-driven transitions between these attractors correspond to abrupt reversals. We show that, with no free parameters, this model generates reversals at a rate within error bars of that observed experimentally, and the relatively stereotyped trajectories in the neighborhood of the reversal also are predicted correctly.
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