Mother-child mutually responsive orientation and real-time physiological coordination

From a biobehavioral framework, mother-child physiological and behavioral coordination are interdependent processes that contribute to children's socioemotional development. Little is known, however, about the temporal pattern of real-time physiological coordination or its associations with global levels of mother-child behavioral coordination. We addressed these gaps using data from 110 mothers and their preschool-aged children (56 girls, M_age  = 53.63 months, SD = 7.74) across two play tasks (i.e., puzzle, pretend play). Using indices of maternal and child parasympathetic response (i.e., changes in respiratory sinus arrhythmia [RSA]) across 15-s epochs, we tested the extent to which within-dyad physiological coordination was contingent on mutually responsive orientation (MRO; a global composite of behavioral coordination and shared positive affect assessed via observer ratings across each play task). Results from a series of two-level coupled autoregressive models indicated that MRO moderated mother-lead RSA coordination, and this pattern emerged across both play tasks. Controlling for stability of within-person RSA changes, increases in maternal RSA at time t - 1 predicted increases in children's RSA at time t, but only for dyads averaging higher MRO during play. No interactions of MRO emerged for child-lead RSA coordination. Findings highlight the importance of dyadic behavioral processes for mother-child physiological coordination.