scholarly journals The critical period for the visual control of foot placement in complex terrain occurs in the preceding step

2014 ◽  
Vol 14 (10) ◽  
pp. 3-3
Author(s):  
J. Matthis ◽  
S. Barton ◽  
B. Fajen
Keyword(s):  
Complex Terrain ◽  
Critical Period ◽  
Visual Control ◽  
Foot Placement ◽  
Preceding Step

scholarly journals The critical phase for visual control of human walking over complex terrain

2017 ◽  
Vol 114 (32) ◽  
pp. E6720-E6729 ◽  
Author(s):  
Jonathan Samir Matthis ◽  
Sean L. Barton ◽  
Brett R. Fajen
Keyword(s):  
Complex Terrain ◽  
Visual Information ◽  
Center Of Mass ◽  
Ground Surface ◽  
The Body ◽  
Foot Placement ◽  
Preceding Step ◽  
Control Work ◽  
Base Of Support ◽  
Target Visibility

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.

scholarly journals Visual control of precise foot placement when walking over complex terrain

2013 ◽  
Vol 13 (9) ◽  
pp. 121-121 ◽  
Author(s):  
J. Matthis ◽  
S. Barton ◽  
B. Fajen
Keyword(s):  
Complex Terrain ◽  
Visual Control ◽  
Foot Placement

scholarly journals Visual control of foot placement when walking over rough terrain

2011 ◽  
Vol 11 (11) ◽  
pp. 915-915 ◽  
Author(s):  
J. Matthis ◽  
B. Fajen
Keyword(s):  
Visual Control ◽  
Rough Terrain ◽  
Foot Placement

scholarly journals The visual control of walking over complex terrain with flat versus raised obstacles

2017 ◽  
Vol 17 (10) ◽  
pp. 707
Author(s):  
Sean Barton ◽  
Scott Steinmetz ◽  
Gabe Diaz ◽  
Jonathan Matthis ◽  
Brett Fajen
Keyword(s):  
Complex Terrain ◽  
Visual Control
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