Recent research suggests that how children’s brains respond to emotional faces can predict their social habits years later, and these brain patterns show very different results for boys and girls. Specifically, higher activity in a brain region called the amygdala tends to predict increased overall social engagement in adolescent girls and decreased social engagement in adolescent boys. The findings were published in the journal Developmental Cognitive Neuroscience.
The human brain has specific areas that work together to manage how we interact with others. Scientists call this complex network the social brain. During early adolescence, the social brain undergoes major developmental changes. These biological changes help prepare young people for an increasingly complex world of peer relationships.
At the same time, children are developing what experts call social health. Social health refers to having an adequate number of friends and high-quality relationships that meet the basic human need for connection. Previous research typically focuses on isolated aspects of social connectedness, such as total number of friends or personal experience of bullying.
However, people naturally experience these social factors in combination rather than in isolation. A research team based at the University of California, Davis, wanted to understand how early social brain function relates to later patterns of complex and interwoven peer relationships. The research team included Miles N. Arrington, Johnna R. Swartz, Jeffrey R. Fine, and Amanda E. Geyer. They designed a study to see if brain activity during childhood could predict certain types of social well-being that a person would experience two years later.
Researchers analyzed data from 5,832 adolescents who participated in the Adolescent Brain Cognitive Development Study. This is a large, ongoing national project that tracks the development of youth across the United States. Scientists looked at brain imaging data collected when the children were 8 to 11 years old.
To observe social brain behavior, participants completed visual tasks inside a functional magnetic resonance imaging (fMRI) scanner. fMRI machines track blood flow in the brain and measure which areas are working the hardest. During this particular task, children saw images of places, faces showing no emotion, and faces showing specific emotional expressions.
Two years later, when the participants were between 10 and 13 years old, they completed several surveys about their social lives. These surveys measured the exact number of close and casual friends each participant had. The questionnaire also recorded experiences such as peer support, physical and relational aggression, bullying, rule-breaking peers and the presence of positive peers.
The researchers used a statistical tool called latent profile analysis to group teenagers based on common social characteristics. This method identifies hidden patterns within large datasets. This allowed the scientists to categorize young people into three different social profiles based on their survey responses.
The first group, comprising approximately 53 percent of the sample, was labeled as a selection profile. These adolescents had smaller friend networks, but generally within the normal population, suggesting that they were simply selecting their peers.
The second group, labeled Robust Profile, comprised approximately 34 percent of the participants. This group reported the highest number of overall friends, close friends, and supportive peers.
The final group, comprising approximately 13 per cent of young people, was classified as having a profile of concern. Adolescents in this group reported the highest levels of aggression, victimhood, and friendships with rule-breaking peers. The researchers also noted that girls were slightly more likely to be in the selective profile and boys were slightly more likely to be in the concerned profile.
The researchers then compared the early brain scan data to the teens’ social profiles to see if they could find any predictive associations. They focused on several key brain regions, including the amygdala. The amygdala is a small, almond-shaped structure deep in the brain that is known for processing strong emotions and quickly detecting important social information.
The analysis revealed that the amygdala was the only brain region that significantly predicted which general social profile a teenager belonged to. Specifically, the researchers found that amygdala activity in response to emotional faces compared to neutral faces predicted different social outcomes depending on the child’s biological sex.
For girls, increased amygdala activity during a face-viewing task tended to predict an increased likelihood of belonging to either the firm or concerned profile two years later. Both of these profiles reflect a high degree of engagement with colleagues, whether that engagement involves positive support or negative conflict.
For boys, the pattern was reversed. Higher activation in the boys’ amygdala tended to predict that they were less likely to belong to these highly social profiles and instead oriented towards more isolated selective groups. The researchers suggest that the amygdala may serve as a measure of overall peer engagement, but that this engagement manifests differently in boys and girls due to biological and social differences.
The researchers also conducted exploratory tests of other brain regions to see if they predicted specific individual social outcomes rather than the overall combined profile. They looked at areas of the brain associated with understanding other people’s thoughts, such as the superior temporal sulcus and the temporoparietal junction. The data provide evidence that reduced activity in these regions predicts increased levels of future aggression.
The researchers also focused on an area associated with predicting social evaluations, known as the medial orbitofrontal cortex. They found that increased activity in this area predicted increased experiences of peer victimization. This suggests that high neural sensitivity to social evaluation may indicate vulnerability to future bullying.
This study has several limitations, so caution should be used when interpreting these results. For example, the original brain imaging task was designed primarily to test working memory rather than to fully capture social and emotional processing. As a result, this task may not fully activate all the complex networks involved in adolescents’ social behavior.
The surveys used to assess social health were also not originally created to measure the concept of social health as a unified whole. The researchers suggest that future studies should utilize tools specifically designed to track social health in daily life.
Another limitation includes the rigorous screening process of brain scans. Only participants who were able to remain completely still provided usable data, which may limit the extent to which these findings apply to the general population.
The study did not track biological changes over time, such as the onset of puberty. Puberty can have a major impact on both brain development and social habits, and often occurs at different times for boys and girls. Future research could track these biological markers to see how they influence the relationship between amygdala activity and peer connections.
The scientists also recommend that future studies look at how the social brain and social health change over time. Exploring how these factors evolve in parallel can help reveal the complex ways in which early brain development shapes a person’s social future.
The study, “Contextualizing the Adolescent Social Brain: Links to Social Health Using Data from the Adolescent Brain Cognitive Development Study,” was authored by Miles N. Arrington, Johnna R. Swartz, Jeffrey R. Fine, and Amanda E. Guyer.
