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Study Indicates That Early Adverse Experiences Have Long-Lasting Effects on Brain Structure, Increasing the Risk of Cognitive and Emotional Problems
Researchers at Mass General Brigham have discovered a direct link between adverse experiences in early childhood and changes in brain development during adolescence. The focus of the study was white matter, responsible for connecting different regions of the brain.
Results indicate that less developed connections are linked to lower cognitive performance. The study also pointed out that certain social factors can help mitigate negative impacts.
White matter acts as a communication network within the brain. It allows different areas to work together to support thoughts and behaviors.
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These connections continue to develop throughout childhood. The environment in which a child grows can directly influence this process.
Sofia Carozza, PhD, and Amar Dhand, MD, PhD, led the research. Both are part of the Department of Neurology at Brigham and Women’s Hospital, which is part of the Mass General Brigham system.
They wanted to understand how early experiences affect the teenage brain and, consequently, cognitive performance.
Study Involving Over 9,000 Children
The researchers used data from the Adolescent Brain Cognitive Development (ABCD) study. This survey is funded by the National Institutes of Health in the United States and encompasses 21 research centers across the country.
Data from 9,082 children, with an average age of 9.5 years, were analyzed. About half of the participants were girls.
The database included information on brain activity, brain structure, cognitive skills, living environment, mood, and mental health. Among the environmental factors analyzed were prenatal risks, economic deprivation, interpersonal adversities, neighborhood difficulties, and elements of social support.
The scientists used diffusion imaging of the brain to measure two characteristics of white matter: fractional anisotropy (FA), which estimates the integrity of connections, and simplified counting, which calculates their strength.
With this, they compared the results to childhood environmental factors and to the cognitive skills of the children, such as language and mental calculation.
The results showed that adverse experiences in childhood are linked to broad differences in white matter connections. These changes appeared in various regions of the brain, especially in areas related to mental arithmetic and receptive language.
Carozza highlighted that the effects of adversities are not concentrated in just one or two points of the brain. “The aspects of white matter that demonstrate a relationship with the environment we live in early in life are much more present in the brain than we thought. Instead of being just one or two important tracts for cognition, the entire brain is related to the adversities someone may face in early life,” she stated.
These differences in brain connections partly explain why children who have faced adversities tend to have lower cognitive performance in adolescence. However, the researchers also observed something positive.
Protective Factors Make a Difference in Cognitive Performance
Some elements of the social environment act as protection for the developing brain. Among them are parental support and strong neighborhood cohesion. These factors helped reduce the negative effects observed in white matter.
Carozza commented on the importance of ensuring a stable environment during childhood. “We are all embedded in an environment, and characteristics of that environment, such as our relationships, home life, neighborhood, or material circumstances, can shape the development of our brains and bodies, which in turn affects what we can do with them,” said Carozza.
“We must work to ensure that more people can have the stable and healthy home life that the brain expects, especially in childhood.,” she concluded.
Despite the advancements, the authors emphasize the limitations of the study. The data are observational, and brain images were collected only once. Therefore, it is not possible to definitively assert cause-and-effect relationships.
To confirm the results, studies that follow children over a longer period, collecting brain images at different stages, would be necessary. Nevertheless, the findings shed light on how the childhood environment can influence cognitive development later on.
With information from SciTechDaily.
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