Long-tail Behavior in Locomotion of Caenorhabditis elegans - Quantitative Biology > Neurons and CognitionReport as inadecuate




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Abstract: The locomotion of Caenorhabditis elegans exhibits complex patterns. Inparticular, the worm combines mildly curved runs and sharp turns to steer itscourse. Both runs and sharp turns of various types are important components oftaxis behavior. The statistics of sharp turns have been intensively studied.However, there have been few studies on runs, except for those on klinotaxisalso called weathervane mechanism, in which the worm gradually curves towardthe direction with a high concentration of chemicals; this phenomenon wasdiscovered recently. We analyzed the data of runs by excluding sharp turns. Weshow that the curving rate obeys long-tail distributions, which implies thatlarge curving rates are relatively frequent. This result holds true forlocomotion in environments both with and without a gradient of NaClconcentration; it is independent of klinotaxis. We propose a phenomenologicalcomputational model on the basis of a random walk with multiplicative noise.The assumption of multiplicative noise posits that the fluctuation of the forceis proportional to the force exerted. The model reproduces the long-tailproperty present in the experimental data.



Author: Jun Ohkubo, Kazushi Yoshida, Yuichi Iino, Naoki Masuda

Source: https://arxiv.org/







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