We designed a 3-5 minute play protocol, between a trained examiner and a child aged 15-30 months. This play protocol is an interactive assessment consist of five stages, in which the examiner elicits social attention, back-and-forth interaction, and nonverbal communication from the child. These behaviors reflect key socio-communicative milestones in the first two years of life, and their diminished occurrence and qualitative difference in expression have been found to represent early markers of autism spectrum disorders.
We have collected 160 sessions of 5-minute interaction from 121 children. All multimodal signals are synchronized, including: