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  • 标题:The critical phase for visual control of human walking over complex terrain
  • 本地全文:下载
  • 作者:Jonathan Samir Matthis ; Sean L. Barton ; Brett R. Fajen
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2017
  • 卷号:114
  • 期号:32
  • 页码:E6720-E6729
  • DOI:10.1073/pnas.1611699114
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:To walk efficiently over complex terrain, humans must use vision to tailor their gait to the upcoming ground surface without interfering with the exploitation of passive mechanical forces. We propose that walkers use visual information to initialize the mechanical state of the body before the beginning of each step so the resulting ballistic trajectory of the walker’s center-of-mass will facilitate stepping on target footholds. Using a precision stepping task and synchronizing target visibility to the gait cycle, we empirically validated two predictions derived from this strategy: (1) Walkers must have information about upcoming footholds during the second half of the preceding step, and (2) foot placement is guided by information about the position of the target foothold relative to the preceding base of support. We conclude that active and passive modes of control work synergistically to allow walkers to negotiate complex terrain with efficiency, stability, and precision.
  • 关键词:human locomotion ; visual control ; foot placement ; biomechanics ; inverted pendulum
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