Interactional synchrony (mirroring actions)
Caregiver and infant respond in time to keep communication going e.g. Infant smiles, caregiver smiles back at the same time. Ensures Infant and caregiver emotions and actions mirror each others.
Meltzoff + Moore conducted a controlled observation of 40 two-week old infants to measure caregiver-infant interactions. An adult displayed one of three facial expressions such as mouth opening. The child's response was filmed, identified, and observed. A link was found between the facial expression and the response of the infant.