Sensing Interpersonal Synchrony between Actors and Autistic Children in Theatre Using Wrist-worn Accelerometers

We introduce a method of using wrist-worn accelerometers to measure non-verbal social coordination within a group that includes autistic children. Our goal was to record and chart the children’s social engagement – measured using interpersonal movement synchrony – as they took part in a theatrical work- shop that was specifically designed to enhance their social skills. Interpersonal synchrony, an important factor of social engagement that is known to be impaired in autism, is cal- culated using a cross-wavelet similarity comparison between participants’ movement data. We evaluate the feasibility of the approach over 3 live performances, each lasting 2 hours, using 6 actors and a total of 10 autistic children. We show that by visualising each child’s engagement over the course of a performance, it is possible to highlight subtle moments of social coordination that might otherwise be lost when review- ing video footage alone. This is important because it points the way to a new method for people who work with autistic children to be able to monitor the development of those in their care, and to adapt their therapeutic activities accordingly.