Interesting new research underscores the importance of play since baby and adult brain activity syncs up when playing together…
Have you ever played with a baby and felt a sense of connection? Even with a baby who doesn’t talk, you might quite literally be “on the same wavelength”, experiencing similar brain activity in the same brain regions.
A team of Princeton researchers has conducted the first study of how baby and adult brains interact during natural play, and they found that baby and adult brain activity rose and fell together as they shared toys and eye contact.
The research was conducted at the Princeton Baby Lab, where University researchers study how babies learn to see, talk and understand the world.
Adult brains sync up when listening to stories
“Previous research has shown that adults’ brains sync up when they watch movies and listen to stories, but little is known about how this ‘neural synchrony’ develops in the first years of life,” says Elise Piazza, an associate research scholar in the Princeton Neuroscience Institute (PNI) and the first author on a paper.
Piazza and her co-authors – Liat Hasenfratz, an associate research scholar in PNI; Uri Hasson, a professor of psychology and neuroscience; and Casey Lew-Williams, an associate professor of psychology – posited that neural synchrony has important implications for social development and language learning.
A child-friendly method of recording brain activity
Studying real-life, face-to-face communication between babies and adults is quite difficult. Most past studies of neural coupling, many of which were conducted in Hasson’s lab, involved scanning adults’ brains with functional magnetic resonance imaging (fMRI), in separate sessions, while the adults lay down and watched movies or listened to stories.
But to study real-time communication, the researchers needed to create a child-friendly method of recording brain activity simultaneously from baby and adult brains.
With funding from the Eric and Wendy Schmidt Transformative Technology Grant, the researchers developed a new dual-brain neuroimaging system that uses functional near-infrared spectroscopy (fNIRS), which is highly safe and records oxygenation in the blood as a proxy for neural activity. The setup allowed the researchers to record the neural coordination between babies and an adult while they played with toys, sang songs and read a book.
The same adult interacted with all 42 infants and toddlers who participated in the study. Of those, 21 had to be excluded because they “squirmed excessively”, and three others flat-out refused to wear the cap, leaving 18 children, ranging in age from nine months to 15 months.
The experiment had two portions:
- The adult experimenter spent five minutes interacting directly with a child – playing with toys, singing nursery rhymes or reading Goodnight Moon – while the child sat on their parent’s lap.
- The experimenter turned to the side and told a story to another adult while the child played quietly with their parent.
The caps collected data from 57 channels of the brain known to be involved in prediction, language processing and understanding other people’s perspectives.
Babies and a high-level understanding of the world
When they looked at the data, the researchers found that during the face-to-face sessions, the babies’ brains were synchronised with the adult’s brain in several areas known to be involved in high-level understanding of the world – perhaps helping the children decode the overall meaning of a story or analyse the motives of the adult reading to them.
When the adult and infant were turned away from each other and engaging with other people, the coupling between them disappeared.
The infant brain often lead the adult brain by a few seconds
There are also a few surprises. For example, the strongest coupling occurred in the prefrontal cortex, which is involved in learning, planning and executive functioning and was previously thought to be quite underdeveloped during infancy.
“We were also surprised to find that the infant brain was often ‘leading’ the adult brain by a few seconds, suggesting that babies do not just passively receive input but may guide adults toward the next thing they’re going to focus on: which toy to pick up, which words to say,” says Lew-Williams, who is a co-director of the Princeton Baby Lab.
“While communicating, the adult and child seem to form a feedback loop,” adds Piazza. “That is, the adult’s brain seemed to predict when the infants would smile, the infants’ brains anticipated when the adult would use more ‘baby talk’, and both brains tracked joint eye contact and joint attention to toys. So, when a baby and adult play together, their brains influence each other in dynamic ways.”
How this could help us
This two-brain approach to neuroscience could open doors to understanding how coupling with caregivers breaks down in an atypical development – such as in children diagnosed with autism – as well as how educators can optimise their teaching approaches to accommodate children’s diverse brains.
The researchers are continuing to investigate how this neural coupling relates to preschoolers’ early language learning.
Source: Princeton University via www.sciencedaily.com
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