Coregulation in mother-infant dyads: links to infants' cardiac vagal tone.

This investigation explored links between mother-infant coregulated communication patterns and infants' emerging parasympathetic regulatory processes (cardiac vagal tone). Participants included 56 first-time mothers and their 6-mo.-old infants (31 girls, 25 boys). A 4-min. baseline EKG was gathered from the infant and an ensuing 15-min. mother-infant dyadic free-play episode was videotaped and coded using Fogel's 1994 Regional Coding System. This system was developed to describe variations in coregulated features of communication among dyads, ranging from symmetrical patterns to disruptive patterns of coregulation. Analysis suggests a positive link between infants' cardiac vagal tone and more symmetrical features of coregulated communication patterns in mother-infant dyads. Cardiac vagal tone was also negatively correlated with unilateral features of coregulation communication systems. These findings point toward the potential relation between emerging physiological regulatory abilities of infants and the more relational regulatory processes in mother-infant dyads.