Tau analysis of mother-infant interaction with bodily contact by a motion-capture system

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Mother-infant communication at the situations of put-down/pick-up, solid-feeding, and tactile play was examined at 6 months and 9 months of age with a use of motion-capture system and a video recording system. The results indicate that mothers and infants communicated with each other by coordinating mutual body even at 6 months of age. The infants became more active in the interaction at 9 months, and the mothers and infants attuned each other's behavior in a more integrated way.The mothers and infants showed special greeting-like behaviors to each other, suggesting an existence of personal space around the mother. The Scottish mothers and infants were more active in interacting playfully in the situation of mild separation-reunion. Analyses were also done for the feeding as well as playing situations to compare different types of behavioral attunement.