نبذة مختصرة : International audience ; The early development of dyadic coordination during interaction arises from repeated multimodal experiences within the system of parental routines (Thelen & Smith, 1994). Traditionally, it has been studied through event-based approaches, which presents challenges, including the definition of meaningful units and the discretization of interaction into successive binary-coded actions (e.g., Bourjade et al., 2023). The aim of this pilot study is to assess the utility of windowed cross-lagged correlation (WCLC) in analyzing the coordination and development of infant-mother interactions through the analysis of body movements before 6 months of age.We recorded 3- minute interactions between four mother–infant dyads using a motion capture system at 1, 3, and 6 months. Reflective markers were placed on the mother’s head and wrist, and on the infant’s head, wrist, and ankle. WCLC was applied to the instantaneous velocity of each marker using RStudio and the rMEA package (Kleinbub & Ramseyer, 2020).Data analysis is ongoing but preliminary findings showed that correlations dynamically changed throughout the sequence, with the leading role alternating between mother and infant. The leading partner varied by dyad, with either the mother or the infant more frequently leading the interaction. Furthermore, the infant body parts showing the highest correlation peaks varied between dyads and across the time points.During early parent–infant interactions, the association patterns between partners’ body movements are non-stationary, with changes in which partner is leading the other. WCLC appears to be a valuable method for analyzing early dyadic coordination, as it captures the dynamic and emergent nature of interactional patterns. Continuous analysis offers a nuanced view of developmental changes in communicative engagement and highlights differences in the parental routines within which infants develop (Jover & Gratier, 2023).
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