Unintentional Interpersonal Synchronization Represented as a Reciprocal Visuo-Postural Feedback System: A Multivariate Autoregressive Modeling Approach
People's behaviors synchronize. It is difficult, however, to determine whether synchronized behaviors occur in a mutual direction--two individuals influencing one another--or in one direction--one individual leading the other, and what the underlying mechanism for synchronization is. To answer...
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description | People's behaviors synchronize. It is difficult, however, to determine whether synchronized behaviors occur in a mutual direction--two individuals influencing one another--or in one direction--one individual leading the other, and what the underlying mechanism for synchronization is. To answer these questions, we hypothesized a non-leader-follower postural sway synchronization, caused by a reciprocal visuo-postural feedback system operating on pairs of individuals, and tested that hypothesis both experimentally and via simulation. In the behavioral experiment, 22 participant pairs stood face to face either 20 or 70 cm away from each other wearing glasses with or without vision blocking lenses. The existence and direction of visual information exchanged between pairs of participants were systematically manipulated. The time series data for the postural sway of these pairs were recorded and analyzed with cross correlation and causality. Results of cross correlation showed that postural sway of paired participants was synchronized, with a shorter time lag when participant pairs could see one another's head motion than when one of the participants was blindfolded. In addition, there was less of a time lag in the observed synchronization when the distance between participant pairs was smaller. As for the causality analysis, noise contribution ratio (NCR), the measure of influence using a multivariate autoregressive model, was also computed to identify the degree to which one's postural sway is explained by that of the other's and how visual information (sighted vs. blindfolded) interacts with paired participants' postural sway. It was found that for synchronization to take place, it is crucial that paired participants be sighted and exert equal influence on one another by simultaneously exchanging visual information. Furthermore, a simulation for the proposed system with a wider range of visual input showed a pattern of results similar to the behavioral results. |
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It is difficult, however, to determine whether synchronized behaviors occur in a mutual direction--two individuals influencing one another--or in one direction--one individual leading the other, and what the underlying mechanism for synchronization is. To answer these questions, we hypothesized a non-leader-follower postural sway synchronization, caused by a reciprocal visuo-postural feedback system operating on pairs of individuals, and tested that hypothesis both experimentally and via simulation. In the behavioral experiment, 22 participant pairs stood face to face either 20 or 70 cm away from each other wearing glasses with or without vision blocking lenses. The existence and direction of visual information exchanged between pairs of participants were systematically manipulated. The time series data for the postural sway of these pairs were recorded and analyzed with cross correlation and causality. Results of cross correlation showed that postural sway of paired participants was synchronized, with a shorter time lag when participant pairs could see one another's head motion than when one of the participants was blindfolded. In addition, there was less of a time lag in the observed synchronization when the distance between participant pairs was smaller. As for the causality analysis, noise contribution ratio (NCR), the measure of influence using a multivariate autoregressive model, was also computed to identify the degree to which one's postural sway is explained by that of the other's and how visual information (sighted vs. blindfolded) interacts with paired participants' postural sway. It was found that for synchronization to take place, it is crucial that paired participants be sighted and exert equal influence on one another by simultaneously exchanging visual information. Furthermore, a simulation for the proposed system with a wider range of visual input showed a pattern of results similar to the behavioral results.</description><identifier>ISSN: 1932-6203</identifier><identifier>EISSN: 1932-6203</identifier><identifier>DOI: 10.1371/journal.pone.0137126</identifier><identifier>PMID: 26398768</identifier><language>eng</language><publisher>United States: Public Library of Science</publisher><subject>Adolescent ; Adult ; Autism ; Autoregressive models ; Behavior ; Causality ; Computer simulation ; Correlation ; Correlation analysis ; Cross correlation ; Demographic aspects ; Feedback ; Feedback, Psychological ; Female ; Head movement ; Human behavior ; Humans ; Movement ; Multivariate Analysis ; Neurosciences ; Nonverbal Communication ; Physiological aspects ; Physiology ; Posture ; Reaction Time ; Regression Analysis ; Simulation ; Social interaction ; Studies ; Synchronism ; Synchronization ; Time lag ; Time series ; Time synchronization ; Verbal communication ; Young Adult</subject><ispartof>PloS one, 2015-09, Vol.10 (9), p.e0137126-e0137126</ispartof><rights>COPYRIGHT 2015 Public Library of Science</rights><rights>2015 Okazaki et al. This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2015 Okazaki et al 2015 Okazaki et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c758t-73209050974c0510899cc0bcacf1b378add9e5855a94d2aefe851b1199601db53</citedby><cites>FETCH-LOGICAL-c758t-73209050974c0510899cc0bcacf1b378add9e5855a94d2aefe851b1199601db53</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4580648/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC4580648/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,723,776,780,860,881,2096,2915,23845,27321,27901,27902,33751,53766,53768,79342,79343</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26398768$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Okazaki, Shuntaro</creatorcontrib><creatorcontrib>Hirotani, Masako</creatorcontrib><creatorcontrib>Koike, Takahiko</creatorcontrib><creatorcontrib>Bosch-Bayard, Jorge</creatorcontrib><creatorcontrib>Takahashi, Haruka K</creatorcontrib><creatorcontrib>Hashiguchi, Maho</creatorcontrib><creatorcontrib>Sadato, Norihiro</creatorcontrib><title>Unintentional Interpersonal Synchronization Represented as a Reciprocal Visuo-Postural Feedback System: A Multivariate Autoregressive Modeling Approach</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>People's behaviors synchronize. It is difficult, however, to determine whether synchronized behaviors occur in a mutual direction--two individuals influencing one another--or in one direction--one individual leading the other, and what the underlying mechanism for synchronization is. To answer these questions, we hypothesized a non-leader-follower postural sway synchronization, caused by a reciprocal visuo-postural feedback system operating on pairs of individuals, and tested that hypothesis both experimentally and via simulation. In the behavioral experiment, 22 participant pairs stood face to face either 20 or 70 cm away from each other wearing glasses with or without vision blocking lenses. The existence and direction of visual information exchanged between pairs of participants were systematically manipulated. The time series data for the postural sway of these pairs were recorded and analyzed with cross correlation and causality. 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Furthermore, a simulation for the proposed system with a wider range of visual input showed a pattern of results similar to the behavioral results.</description><subject>Adolescent</subject><subject>Adult</subject><subject>Autism</subject><subject>Autoregressive models</subject><subject>Behavior</subject><subject>Causality</subject><subject>Computer simulation</subject><subject>Correlation</subject><subject>Correlation analysis</subject><subject>Cross correlation</subject><subject>Demographic aspects</subject><subject>Feedback</subject><subject>Feedback, Psychological</subject><subject>Female</subject><subject>Head movement</subject><subject>Human behavior</subject><subject>Humans</subject><subject>Movement</subject><subject>Multivariate Analysis</subject><subject>Neurosciences</subject><subject>Nonverbal Communication</subject><subject>Physiological aspects</subject><subject>Physiology</subject><subject>Posture</subject><subject>Reaction Time</subject><subject>Regression 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Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Okazaki, Shuntaro</au><au>Hirotani, Masako</au><au>Koike, Takahiko</au><au>Bosch-Bayard, Jorge</au><au>Takahashi, Haruka K</au><au>Hashiguchi, Maho</au><au>Sadato, Norihiro</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unintentional Interpersonal Synchronization Represented as a Reciprocal Visuo-Postural Feedback System: A Multivariate Autoregressive Modeling Approach</atitle><jtitle>PloS one</jtitle><addtitle>PLoS One</addtitle><date>2015-09-23</date><risdate>2015</risdate><volume>10</volume><issue>9</issue><spage>e0137126</spage><epage>e0137126</epage><pages>e0137126-e0137126</pages><issn>1932-6203</issn><eissn>1932-6203</eissn><abstract>People's behaviors synchronize. It is difficult, however, to determine whether synchronized behaviors occur in a mutual direction--two individuals influencing one another--or in one direction--one individual leading the other, and what the underlying mechanism for synchronization is. To answer these questions, we hypothesized a non-leader-follower postural sway synchronization, caused by a reciprocal visuo-postural feedback system operating on pairs of individuals, and tested that hypothesis both experimentally and via simulation. In the behavioral experiment, 22 participant pairs stood face to face either 20 or 70 cm away from each other wearing glasses with or without vision blocking lenses. The existence and direction of visual information exchanged between pairs of participants were systematically manipulated. The time series data for the postural sway of these pairs were recorded and analyzed with cross correlation and causality. Results of cross correlation showed that postural sway of paired participants was synchronized, with a shorter time lag when participant pairs could see one another's head motion than when one of the participants was blindfolded. In addition, there was less of a time lag in the observed synchronization when the distance between participant pairs was smaller. As for the causality analysis, noise contribution ratio (NCR), the measure of influence using a multivariate autoregressive model, was also computed to identify the degree to which one's postural sway is explained by that of the other's and how visual information (sighted vs. blindfolded) interacts with paired participants' postural sway. It was found that for synchronization to take place, it is crucial that paired participants be sighted and exert equal influence on one another by simultaneously exchanging visual information. Furthermore, a simulation for the proposed system with a wider range of visual input showed a pattern of results similar to the behavioral results.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>26398768</pmid><doi>10.1371/journal.pone.0137126</doi><oa>free_for_read</oa></addata></record> |
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subjects | Adolescent Adult Autism Autoregressive models Behavior Causality Computer simulation Correlation Correlation analysis Cross correlation Demographic aspects Feedback Feedback, Psychological Female Head movement Human behavior Humans Movement Multivariate Analysis Neurosciences Nonverbal Communication Physiological aspects Physiology Posture Reaction Time Regression Analysis Simulation Social interaction Studies Synchronism Synchronization Time lag Time series Time synchronization Verbal communication Young Adult |
title | Unintentional Interpersonal Synchronization Represented as a Reciprocal Visuo-Postural Feedback System: A Multivariate Autoregressive Modeling Approach |
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