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Recent studies support the hypothesis that oxytocin plays an important role in mother-infant interactions. The aim of the present research was to investigate the connection between Maternal Affect Attunement and levels of oxytocin in mothers and infants during early mother-infant communication, and to explore the relationship between maternal and infants' oxytocin levels. Forty three mother-infant dyads participated in the present study when infants were four months. They were observed in three conditions: 1) Baseline - where no communication took place, 2) Natural Interaction between mother and infant and 3) Modified Interactions - where natural interaction between mothers and infants was disrupted in various ways. During this procedure four saliva samples from mothers and their infants were collected to determine their levels of oxytocin at different time points. To assess individual maternal interactive style Maternal Affect Attunement (Maintaining Attention, Warm Sensitivity) was coded during the Natural Interaction. Results indicated that maternal and infants' oxytocin levels were stable at the four collection points. Maternal oxytocin levels at all collection points as well as overall mean oxytocin level were negatively related to her Warm Sensitivity. Significant positive synchronized as...