mom and baby having fun

New research shows that the brains of mothers and infants can connect, making a neural “mega network.” The connection helps children learn, and is especially strong when there are positive emotions.

Mothers’ and babies’ brains can work together as a ‘mega-network’ by synchronising brain waves when they interact. The level of connectivity of the brain waves varies according to the mother’s emotional state: when mothers express more positive emotions their brain becomes much more strongly connected with their baby’s brain. This may help the baby to learn and its brain to develop.

The research, published in the journal NeuroImage, used a method called dual electroencephalograhy (EEG) to look at brain signals in both mothers and babies while they were interacting with each other. They found that mothers and babies tend to synchronise their brain waves in the frequency of 6-9 hertz, the infant alpha range.

Mothers and babies tend to spend a lot of time together in a positive emotional state, in which their brains are very connected. The study found that positive interaction, with lots of eye contact, enhances the ability of mother and infant brains to operate as a single system. This promotes efficient sharing and flow of information between mother and infant.

“From our previous work, we know that when the neural connection between mothers and babies is strong, babies are more receptive and ready to learn from their mothers,” said Dr Vicky Leong in the University of Cambridge’s Department of Psychology, who led the study. “At this stage of life, the baby brain has the ability to change significantly, and these changes are driven by the baby’s experiences. By using a positive emotional tone during social interactions, parents can connect better with their infants, and stimulate development of their baby’s mental capacity.”

The results also suggest that babies of depressed mothers may show less evidence of learning because of a weakened neural connection between mother and infant. Mothers who experience a persistently low or negative mental state due to clinical depression tend to have less interaction with their baby. Their speech is often flatter in tone, they make much less eye contact, and they are less likely to respond when their baby tries to get their attention.

“Our emotions literally change the way that our brains share information with others — positive emotions help us to communicate in a much more efficient way,” said Dr Leong. “Depression can have a powerfully negative effect on a parent’s ability to establish connections with their baby. All the social cues that normally foster connection are less readily available to the child, so the child doesn’t receive the optimal emotional input it needs to thrive.”

Emotional communication between parents and their children is crucial during early life, yet little is known about its neural underpinnings. This is the first brain imaging study of two related individuals to investigate if and how babies’ interpersonal neural connectivity with their mothers is affected by the emotional quality of their social interaction.

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