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    Utility of Peripheral Visual Cues in Planning and Controlling Adaptive Gait

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    Publication date
    2010-01
    Author
    Graci, Valentina
    Elliott, David B.
    Buckley, John G.
    Keyword
    Peripheral visual cues
    Obstacle crossing
    Visual exproprioception
    Visual exteroception
    Doorframe
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    The purpose of this article is to determine the relative importance to adaptive locomotion of peripheral visual cues provided by different parts of the visual field. Twelve subjects completed obstacle crossing trials while wearing goggles that provided four visual conditions: upper visual field occlusion, lower visual field occlusion (LO), circumferential peripheral visual field occlusion (CPO), and full vision. The obstacle was either positioned as a lone structure or within a doorframe. Given that subjects completed the task safely without cues from the lower or peripheral visual field, this suggests that subjects used exteroceptive information provided in a feed-forward manner under these conditions. LO and CPO led to increased foot placement distance from the obstacle and to increased toe clearance over the obstacle with a reduced crossing-walking velocity. The increased variability of dependent measures under LO and CPO suggests that exproprioceptive information from the peripheral visual field is generally used to provide online control of lower limbs. The presence of the doorframe facilitated lead-foot placement under LO by providing exproprioceptive cues in the upper visual field. However, under CPO conditions, the doorframe led to a further reduction in crossing velocity and increase in trail-foot horizontal distance and lead-toe clearance, which may have been because of concerns about hitting the doorframe with the head and/or upper body. Our findings suggest that exteroceptive cues are provided by the central visual field and are used in a feed-forward manner to plan the gait adaptations required to safely negotiate an obstacle, whereas exproprioceptive information is provided by the peripheral visual field and used online to “fine tune” adaptive gait. The loss of the upper and lower peripheral visual fields together had a greater effect on adaptive gait compared with the loss of the lower visual field alone, likely because of the absence of lamellar flow visual cues used to control egomotion.
    URI
    http://hdl.handle.net/10454/15844
    Version
    No full-text in the repository
    Citation
    Graci V, Elliott DB and Buckley JG (2010) Utility of Peripheral Visual Cues in Planning and Controlling Adaptive Gait. Optometry and Vision Science. 87(1): 21-27.
    Link to publisher’s version
    https://doi.org10.1097/OPX.0b013e3181c1d547
    Type
    Article
    Collections
    Life Sciences Publications
    Engineering and Digital Technology Publications

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