Kortikalische Dicke in Serotonin-verknüpften Gehirnregionen, die an psychische Probleme bei Kindern gebunden sind | Diese Ergebnisse legen nahe, dass Aspekte der Gehirnentwicklung im Zusammenhang mit dem Serotonin -System zu frühen Anzeichen einer psychologischen Anfälligkeit beitragen können.

From the article: A new study [published](https://www.sciencedirect.com/science/article/pii/S2213158225001214?via%3Dihub) in NeuroImage: Clinical has found that behavioral and emotional problems in children are linked to differences in the structure of brain regions associated with serotonin. The researchers found that 10-year-olds who reported more symptoms of attention, emotional, or externalizing difficulties tended to show altered brain morphology in serotonin-rich areas, especially in terms of cortical thickness and surface area. These findings suggest that aspects of brain development related to the serotonin system may contribute to early signs of psychological vulnerability.

Serotonin, often referred to as 5-HT, is a chemical messenger involved in regulating mood, attention, and emotional behavior. But its role begins long before those functions emerge. During early development, serotonin helps organize how the brain is wired. It guides processes such as cell growth, migration, and the formation of synapses—the connections between brain cells. Because it is widely distributed and acts on many types of receptors, serotonin influences a range of other neurotransmitter systems, including dopamine and GABA.

Importantly, the serotonin system is still maturing during childhood and adolescence. Shifts in serotonin receptors and transporters across brain regions during this period are thought to influence how circuits for emotion and behavior develop. If these systems are disrupted—by genetic variation or environmental stress—they may contribute to the emergence of psychiatric symptoms.

The new study was conducted by a research team led by Dogukan Koc and colleagues from Erasmus University Medical Centre in the Netherlands and the University of Copenhagen in Denmark. Their aim was to clarify whether the shape and size of brain regions that are especially influenced by serotonin are linked to behavioral problems in children. They used an advanced atlas of serotonin-related brain areas derived from adult brain imaging studies and applied it to brain scans from a large pediatric sample.

“Adolescence is a sensitive window for mental health, yet we still know little about how brain biology contributes to behavioral difficulties during this period,” explained Koc, a PhD candidate. “Serotonin – a chemical that helps regulate mood, anxiety, and orchestrates early brain development – is a major target for psychiatric treatments. Yet, no one had examined how serotonin-related brain structures, such as serotonin-enriched cortical regions, develop in children in a large population.”

“When a new brain map of serotonin (called the NRU 5-HT Atlas) became available, it gave us the unique opportunity to bridge molecular neuroscience with large-scale imaging in children. Then we could ask if brain regions, which are particularly subserved by serotonergic innervation, also appear critical for emotional function and behavior in children.”