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    The addition of stripes (a version of the ‘horizontal-vertical illusion’) increases foot clearance when crossing low-height obstacles

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    Publication date
    2016
    Author
    Foster, Richard J.
    Buckley, John G.
    Whitaker, David J.
    Elliott, David B.
    Keyword
    Tripping, Obstacle crossing, Horizontal-vertical illusion, Toe clearance, Door-frame
    Rights
    © 2015 Taylor & Francis. This is an Author's Original Manuscript of an article published by Taylor & Francis in Ergonomics in 2015, available online at http://www.tandfonline.com/10.1080/00140139.2015.1105304
    Peer-Reviewed
    yes
    
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    Abstract
    Trips over obstacles are one of the main causes of falling in older adults, with vision playing an important role in successful obstacle negotiation. We determined whether a horizontal-vertical illusion, superimposed onto low-height obstacles to create a perceived increase in obstacle height, increased foot clearances during obstacle negotiation thus reducing the likelihood of tripping. Eleven adults (mean ± 1 SD: age 27.3 ± 5.1 years) negotiated obstacles of varying heights (3, 5, 7 cm) with four different appearance conditions; two were obstacles with a horizontal-vertical illusion (vertical stripes of different thickness) superimposed on the front, one was a plain obstacle and the fourth a plain obstacle with a horizontal black line painted on the top edge. Foot clearance parameters were compared across conditions. Both illusions led to a significant increase in foot clearance when crossing the obstacle, compared to the plain condition, irrespective of obstacle height. Superimposing a horizontal-vertical illusion onto low-height obstacles can increase foot clearance, and its use on the floor section of a double-glazing door frame for example may reduce the incidence of tripping in the home.
    URI
    http://hdl.handle.net/10454/8241
    Version
    Accepted Manuscript
    Citation
    Foster RJ, Buckley JG, Whitaker D and Elliott DB (2016) The addition of stripes (a version of the ‘horizontal-vertical illusion’) increases foot clearance when crossing low-height obstacles, Ergonomics. 59(7): 884-889.
    Link to publisher’s version
    http://dx.doi.org/10.1080/00140139.2015.1105304
    Type
    Article
    Collections
    Life Sciences Publications
    Engineering and Informatics Publications

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