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    Mechanisms of interpersonal sway synchrony and stability

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    Authors
    Reynolds, Raymond Francis
    Osler, Callum J.
    Affiliation
    University of Birmingham
    University of Derby
    Issue Date
    2014-10-22
    
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    Abstract
    Here we explain the neural and mechanical mechanisms responsible for synchronizing sway and improving postural control during physical contact with another standing person. Postural control processes were modelled using an inverted pendulum under continuous feedback control. Interpersonal interactions were simulated either by coupling the sensory feedback loops or by physically coupling the pendulums with a damped spring. These simulations precisely recreated the timing and magnitude of sway interactions observed empirically. Effects of firmly grasping another person's shoulder were explained entirely by the mechanical linkage. This contrasted with light touch and/or visual contact, which were explained by a sensory weighting phenomenon; each person's estimate of upright was based on a weighted combination of veridical sensory feedback combined with a small contribution from their partner. Under these circumstances, the model predicted reductions in sway even without the need to distinguish between self and partner motion. Our findings explain the seemingly paradoxical observation that touching a swaying person can improve postural control.
    Citation
    Reynolds, R. F., Osler, C. J (2014) 'Mechanisms of interpersonal sway synchrony and stability', Journal of The Royal Society Interface, 11 (20140751), pp. 1-11
    Publisher
    The Royal Society
    Journal
    Journal of The Royal Society Interface
    URI
    http://hdl.handle.net/10545/335867
    DOI
    10.1098/rsif.2014.0751
    Additional Links
    http://rsif.royalsocietypublishing.org/cgi/doi/10.1098/rsif.2014.0751
    Type
    Article
    Language
    en
    ISSN
    1742-5689
    EISSN
    1742-5662
    ae974a485f413a2113503eed53cd6c53
    10.1098/rsif.2014.0751
    Scopus Count
    Collections
    Human Sciences Research Centre

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