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タイトル: | Evaluating functional roles of phase resetting in generation of adaptive human bipedal walking with a physiologically based model of the spinal pattern generator. |
著者: | Aoi, Shinya Ogihara, Naomichi Funato, Tetsuro Sugimoto, Yasuhiro Tsuchiya, Kazuo |
著者名の別形: | 青井, 伸也 |
キーワード: | Neuromusculoskeletal model Human bipedal walking Numerical simulation Central pattern generator Phase resetting Adaptability |
発行日: | May-2010 |
出版者: | Springer-Verlag. |
誌名: | Biological cybernetics |
巻: | 102 |
号: | 5 |
開始ページ: | 373 |
終了ページ: | 387 |
抄録: | The central pattern generators (CPGs) in the spinal cord strongly contribute to locomotor behavior. To achieve adaptive locomotion, locomotor rhythm generated by the CPGs is suggested to be functionally modulated by phase resetting based on sensory afferent or perturbations. Although phase resetting has been investigated during fictive locomotion in cats, its functional roles in actual locomotion have not been clarified. Recently, simulation studies have been conducted to examine the roles of phase resetting during human bipedal walking, assuming that locomotion is generated based on prescribed kinematics and feedback control. However, such kinematically based modeling cannot be used to fully elucidate the mechanisms of adaptation. In this article we proposed a more physiologically based mathematical model of the neural system for locomotion and investigated the functional roles of phase resetting. We constructed a locomotor CPG model based on a two-layered hierarchical network model of the rhythm generator (RG) and pattern formation (PF) networks. The RG model produces rhythm information using phase oscillators and regulates it by phase resetting based on foot-contact information. The PF model creates feedforward command signals based on rhythm information, which consists of the combination of five rectangular pulses based on previous analyses of muscle synergy. Simulation results showed that our model establishes adaptive walking against perturbing forces and variations in the environment, with phase resetting playing important roles in increasing the robustness of responses, suggesting that this mechanism of regulation may contribute to the generation of adaptive human bipedal locomotion. |
著作権等: | The original publication is available at www.springerlink.com This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/128937 |
DOI(出版社版): | 10.1007/s00422-010-0373-y |
PubMed ID: | 20217427 |
出現コレクション: | 学術雑誌掲載論文等 |
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