Mechanisms of interpersonal sway synchrony and stability
Identifieur interne : 001051 ( Main/Curation ); précédent : 001050; suivant : 001052Mechanisms of interpersonal sway synchrony and stability
Auteurs : Raymond F. Reynolds [Royaume-Uni] ; Callum J. Osler [Royaume-Uni]Source :
- Journal of the Royal Society Interface [ 1742-5689 ] ; 2014.
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.
Url:
DOI: 10.1098/rsif.2014.0751
PubMed: 25339686
PubMed Central: 4223902
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Osler</name><affiliation wicri:level="1"><nlm:aff id="af2"><addr-line>Department of Life Sciences</addr-line>,<institution>University of Derby</institution>,<addr-line>Kedleston Road, Derby DE22 1GB</addr-line>,<country>UK</country></nlm:aff><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25339686</idno><idno type="pmc">4223902</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4223902</idno><idno type="RBID">PMC:4223902</idno><idno type="doi">10.1098/rsif.2014.0751</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">002071</idno><idno type="wicri:Area/Pmc/Curation">002071</idno><idno type="wicri:Area/Pmc/Checkpoint">000B24</idno><idno type="wicri:Area/Ncbi/Merge">003390</idno><idno type="wicri:Area/Ncbi/Curation">003390</idno><idno type="wicri:Area/Ncbi/Checkpoint">003390</idno><idno type="wicri:doubleKey">1742-5689:2014:Reynolds R:mechanisms:of:interpersonal</idno><idno type="wicri:Area/Main/Merge">001052</idno><idno type="wicri:Area/Main/Curation">001051</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Mechanisms of interpersonal sway synchrony and stability</title><author><name sortKey="Reynolds, Raymond F" sort="Reynolds, Raymond F" uniqKey="Reynolds R" first="Raymond F." last="Reynolds">Raymond F. Reynolds</name><affiliation wicri:level="1"><nlm:aff id="af1"><addr-line>School of Sport, Exercise and Rehabilitation Sciences</addr-line>,<institution>University of Birmingham</institution>,<addr-line>Birmingham B15 2TT</addr-line>,<country>UK</country></nlm:aff><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author><author><name sortKey="Osler, Callum J" sort="Osler, Callum J" uniqKey="Osler C" first="Callum J." last="Osler">Callum J. Osler</name><affiliation wicri:level="1"><nlm:aff id="af2"><addr-line>Department of Life Sciences</addr-line>,<institution>University of Derby</institution>,<addr-line>Kedleston Road, Derby DE22 1GB</addr-line>,<country>UK</country></nlm:aff><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea># see nlm:aff country strict</wicri:regionArea></affiliation></author></analytic><series><title level="j">Journal of the Royal Society Interface</title><idno type="ISSN">1742-5689</idno><idno type="eISSN">1742-5662</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>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. 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