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A reduced-dimensionality approach to uncovering dyadic modes of body motion in conversations

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  • Guy Gaziv
  • Lior Noy
  • Yuvalal Liron
  • Uri Alon

Abstract

Face-to-face conversations are central to human communication and a fascinating example of joint action. Beyond verbal content, one of the primary ways in which information is conveyed in conversations is body language. Body motion in natural conversations has been difficult to study precisely due to the large number of coordinates at play. There is need for fresh approaches to analyze and understand the data, in order to ask whether dyads show basic building blocks of coupled motion. Here we present a method for analyzing body motion during joint action using depth-sensing cameras, and use it to analyze a sample of scientific conversations. Our method consists of three steps: defining modes of body motion of individual participants, defining dyadic modes made of combinations of these individual modes, and lastly defining motion motifs as dyadic modes that occur significantly more often than expected given the single-person motion statistics. As a proof-of-concept, we analyze the motion of 12 dyads of scientists measured using two Microsoft Kinect cameras. In our sample, we find that out of many possible modes, only two were motion motifs: synchronized parallel torso motion in which the participants swayed from side to side in sync, and still segments where neither person moved. We find evidence of dyad individuality in the use of motion modes. For a randomly selected subset of 5 dyads, this individuality was maintained for at least 6 months. The present approach to simplify complex motion data and to define motion motifs may be used to understand other joint tasks and interactions. The analysis tools developed here and the motion dataset are publicly available.

Suggested Citation

  • Guy Gaziv & Lior Noy & Yuvalal Liron & Uri Alon, 2017. "A reduced-dimensionality approach to uncovering dyadic modes of body motion in conversations," PLOS ONE, Public Library of Science, vol. 12(1), pages 1-23, January.
  • Handle: RePEc:plo:pone00:0170786
    DOI: 10.1371/journal.pone.0170786
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    References listed on IDEAS

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    1. Assi Dahan & Lior Noy & Yuval Hart & Avi Mayo & Uri Alon, 2016. "Exit from Synchrony in Joint Improvised Motion," PLOS ONE, Public Library of Science, vol. 11(10), pages 1-19, October.
    2. Dagmar Sternad & Se-Woong Park & Hermann Müller & Neville Hogan, 2010. "Coordinate Dependence of Variability Analysis," PLOS Computational Biology, Public Library of Science, vol. 6(4), pages 1-16, April.
    3. J. A. S. Kelso & A. Fuchs & R. Lancaster & T. Holroyd & D. Cheyne & H. Weinberg, 1998. "Dynamic cortical activity in the human brain reveals motor equivalence," Nature, Nature, vol. 392(6678), pages 814-818, April.
    4. Yuval Hart & Lior Noy & Rinat Feniger-Schaal & Avraham E Mayo & Uri Alon, 2014. "Individuality and Togetherness in Joint Improvised Motion," PLOS ONE, Public Library of Science, vol. 9(2), pages 1-8, February.
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