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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Veröffentlicht in:PloS one 2015-09, Vol.10 (9), p.e0137126-e0137126
Hauptverfasser: Okazaki, Shuntaro, Hirotani, Masako, Koike, Takahiko, Bosch-Bayard, Jorge, Takahashi, Haruka K, Hashiguchi, Maho, Sadato, Norihiro
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container_issue 9
container_start_page e0137126
container_title PloS one
container_volume 10
creator Okazaki, Shuntaro
Hirotani, Masako
Koike, Takahiko
Bosch-Bayard, Jorge
Takahashi, Haruka K
Hashiguchi, Maho
Sadato, Norihiro
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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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. 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source MEDLINE; DOAJ Directory of Open Access Journals; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; Sociological Abstracts; Public Library of Science (PLoS)
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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