A Time-Varying Measure of Dyadic Synchrony for Three-Dimensional Motion

Philip T. Reiss, Hila Z. Gvirts, Rotem Bennet, Alisa Kanterman, Nardine Fahoum, Simone G. Shamay-Tsoory

Research output: Contribution to journalArticlepeer-review


We propose a novel approach to the analysis of synchronized three-dimensional motion in dyads. Motion recorded at high time resolution, as with a gaming device, is preprocessed in each of the three spatial dimensions by spline smoothing. Synchrony is then defined, at each time point, as the cosine between the two individuals’ estimated velocity vectors. The approach is extended to allow a time lag, allowing for the analysis of leader-follower dynamics. Mean square cosine over the time range is proposed as a scalar summary of dyadic synchrony, and this measure is found to be positively associated with cognitive empathy.

Original languageEnglish
Pages (from-to)530-541
Number of pages12
JournalMultivariate Behavioral Research
Issue number4
StatePublished - 4 Jul 2019

Bibliographical note

Publisher Copyright:
© 2019, © 2019 Taylor & Francis Group, LLC.


  • Empathy
  • interpersonal synchrony
  • leader-follower dynamics
  • spline smoothing
  • three-dimensional motion
  • transcranial direct current stimulation

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Statistics and Probability


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