attachment is a two way emotional bond in which both parties rely on each other for support.
communications between infant and caregiver are believed to have important functions for a child's development.
reciprocity is where the infant and caregiver respond to each other’s actions, taking turns. often described as a dance (brazelton) from three months onwards this increased as both pay more attention to each other.
interactional synchrony is where the infant and caregiver mirror each other in a synchronised way. meltzoff and moore found a clear association between infants behaviour and the adult model.