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    Obstacle crossing during locomotion: Visual exproprioceptive information is used in an online mode to update foot placement before the obstacle but not swing trajectory over it

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    timmis_buckley_2012.pdf (377.0Kb)
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    Publication date
    2012-05
    Author
    Timmis, Matthew A.
    Buckley, John G.
    Keyword
    Human locomotion
    Visual exproprioception
    Lower visual field
    Vision
    Obstacle avoidance
    Rights
    © 2012 Elsevier. Full-text reproduced in accordance with the publisher’s self-archiving policy. This article is distributed under the Creative Commons CC-BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/2.0/uk/)
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    Although gaze during adaptive gait involving obstacle crossing is typically directed two or more steps ahead, visual information of the swinging lower-limb and its relative position in the environment (termed visual exproprioception) is available in the lower visual field (lvf). This study determined exactly when lvf exproprioceptive information is utilised to control/update lead-limb swing trajectory during obstacle negotiation. 12 young participants negotiated an obstacle wearing smart-glass goggles which unpredictably occluded the lvf for certain periods during obstacle approach and crossing. Trials were also completed with lvf occluded for the entirety of the trial. When lvf was occluded throughout, footplacement distance and toe-clearance became significantly increased; which is consistent with previous work that likewise used continuous lvf occlusion. Both variables were similarly affected by lvf occlusion from instant of penultimate-step contact, but both were unaffected when lvf was occluded from instant of final-step contact. These findings suggest that lvf (exproprioceptive) input is typically used in an online manner to control/update final foot-placement, and that without such control, uncertainty regarding foot placement causes toe-clearance to be increased. Also that lvf input is not normally exploited in an online manner to update toe-clearance during crossing: which is contrary to what previous research has suggested.
    URI
    http://hdl.handle.net/10454/15842
    Version
    Accepted manuscript
    Citation
    Timmis MA and Buckley JG (2012) Obstacle crossing during locomotion: Visual exproprioceptive information is used in an online mode to update foot placement before the obstacle but not swing trajectory over it. Gait and Posture. 36(1): 160-162.
    Link to publisher’s version
    https://doi.org/10.1016/j.gaitpost.2012.02.008
    Type
    Article
    Collections
    Engineering and Informatics Publications

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