Dynamic Theta-Alpha Inter-Brain Model during Mother-Preschooler Cooperation

Area of Science:

• Neuroscience
• Developmental Psychology
• Child Development

Background:

• Mother-child interactions are dynamic and involve neural processes.
• Inter-brain synchrony (IBS) at theta and alpha rhythms characterizes these interactions.
• The establishment, dynamics, and roles of IBS in mother-child interactions are not well understood.

Purpose of the Study:

• To investigate the dynamic changes and roles of inter-brain synchrony (IBS) during mother-preschooler interactions.
• To construct a dynamic inter-brain model of mother-child neural synchrony.
• To explore the neural substrates underlying IBS dynamics in early childhood interactions.

Main Methods:

• Simultaneous dynamic analysis of inter-brain EEG synchrony, intra-brain EEG power, and interactive behaviors.
• Studied 40 mother-preschooler dyads during turn-taking cooperation.
• Developed a dynamic inter-brain model based on EEG frequency shifts and IBS states.

Main Results:

• Theta-IBS and alpha-IBS states alternated with interactive behaviors, with EEG frequency shifts preceding transitions.
• Mothers' theta-IBS increased when tracking children's attention or intentions.
• Alpha-IBS was more prominent during mother-led interactions, and theta-IBS was more stable in cooperative dyads with strong emotional bonds.

Conclusions:

• Inter-brain synchrony dynamics are crucial for mother-preschooler interactions.
• EEG frequency shifts facilitate transitions between theta-IBS and alpha-IBS states.
• Theta-IBS is associated with child-focused attention and cooperation, while alpha-IBS relates to mother-led engagement.