The immediate effect of kangaroo mother care on Mother-infant inter-brain synchrony and infant brain function

A groundbreaking study published on arXiv by researchers from multiple Chinese institutions provides the first direct neural evidence of Kangaroo Mother Care's immediate benefits. The team, led by Yu Liu and Jiayang Xu, used synchronous dual-electroencephalography (EEG) to monitor 58 preterm infants (gestational age <32 weeks or birth weight <1500g) and their mothers during their first KMC session. They measured infant brain function through power spectrum analysis and graph theory-based network metrics, while quantifying mother-infant inter-brain synchrony using phase-locking value (PLV).

During KMC, infants showed enhanced theta, alpha, and beta brainwave power alongside reduced relative delta power, indicating more mature brain activity patterns. Simultaneously, mother-infant inter-brain synchrony significantly increased across all frequency bands, with both inter-brain density and strength showing dramatic improvements (all p < .001). The researchers discovered that in the alpha frequency band, inter-brain strength correlated positively with infant local efficiency and clustering coefficient—key measures of brain network organization.

Perhaps most significantly, the study found that in the beta band, inter-brain synchrony strength was positively correlated with infant small-worldness, a crucial property of efficient brain networks. This suggests KMC doesn't just create temporary neural harmony but may actually promote the development of optimal brain network architecture in preterm infants. The immediate enhancement of both single-brain activity and inter-brain synchrony provides a neurophysiological mechanism explaining KMC's documented long-term benefits for neurodevelopment.

The research represents a major advance in understanding how early interventions affect developing brains, offering quantifiable metrics for assessing caregiver-infant bonding at the neural level. These findings could lead to more targeted neonatal care protocols and provide objective measures for evaluating the effectiveness of various developmental interventions in the NICU setting.