The timing of brain development may signal future anxiety and depression risk

Analysis of almost 30,000 brain scans suggests that when key regions mature, as well as where they develop, may help explain vulnerability to anxiety and depression in adolescence.

A child’s pace of brain development may help reveal whether anxiety or depression will appear years later, according to research published in Nature that followed almost 30,000 brain scans and linked maturation patterns to later mental health symptoms. The findings suggest that the roots of some psychiatric conditions may lie not only in where the brain develops, but in when key regions mature. Researchers say this shifts attention towards developmental timing as a possible clue to vulnerability long before difficulties become visible.

The study, led by teams at the University of Iowa and Mass General Brigham, tracked children from around age nine at two-year intervals and found that the cerebral cortex, the brain’s outer layer, does not mature evenly. Sensory regions such as the visual cortex tended to mature earlier, around the early teenage years, while frontal areas involved in planning, concentration and emotional control developed later, at about age 16. Children who had a thicker cortex in sensory regions at age nine were more likely to report anxiety and depression by age 13, suggesting that slower-than-expected thinning in these areas may be linked to later risk.

Dr Joshua Roffman, a psychiatrist at Mass General Brigham and one of the study’s authors, said the key question is not simply what a region of the brain does, but when it matures. Dr Avram Holmes, a systems neuroscientist at Rutgers University, said the work highlights the importance of timing in brain development when looking at psychiatric symptoms. By comparing the scan data with brain atlases, the researchers found that the regions associated with future symptoms overlapped with gene networks that are active in the womb, pointing to the possibility that early genetic programming helps shape later mental health risk.

The results add to a growing body of evidence that adolescent depression and anxiety can be tied to neurodevelopmental pathways that begin much earlier in life. Other studies in Nature have linked mood and anxiety disorders in young people to distinct brain maturational patterns, while separate research has pointed to sex-specific developmental trajectories and connections between anxiety, brain structure and family or genetic risk. Even so, the authors stressed that these are population-level patterns, not a clinical test for individual children. Holmes said the findings provide one of the clearest pictures yet of cortical development from childhood into adolescence, but are not yet enough on their own to predict illness in a single child.