AI Insight
This longitudinal study of 4,525 youth aged 9-18 found that early exposure to threat-based adversity selectively expanded the somato-cognitive action network (SCAN), a brain network that integrates sensorimotor and cognitive functions. The SCAN expansion was dose-dependent, nearly seven times larger than effects on other networks, and shifted toward sensorimotor regions while reducing connectivity with cognitive control systems. This network reorganization mediated the relationship between threat exposure and poorer cognitive outcomes, with findings replicated across multiple timepoints and samples.
Why it matters
The findings reveal that childhood adversity doesn't broadly affect the brain but specifically targets a single integrative network linking brain and body functions. This could inform targeted interventions for children exposed to threat and helps explain why early adversity impacts both cognitive development and stress-related physical outcomes.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Early adversity is among the most potent environmental influences on the developing brain; yet whether it remodels the areal layout of cortical networks, and along which dimensions, is unknown. In a longitudinal sample of 4,525 youth aged 9-18, we derived individualized cortical parcellations and related the topography of 15 networks to 10 data-driven dimensions of adversity. Greater exposure to threat, but not deprivation or unpredictability, predicted dose-dependent expansion of the somato-cognitive action network (SCAN), an effect nearly seven times larger than for any other network. The SCAN expanded toward the sensorimotor pole, encroached on neighbors, and shifted functional connectivity toward sensorimotor and away from control systems. Expansion mediated the association between threat and poorer cognition, replicating across waves, within children, and out-of-sample. Rather than diffusing across many systems, the imprint of adversity on the developing cortex converges on the territory of a single integrative network that couples brain to body.
Source: Early Adversity Selectively Reshapes the Somato-Cognitive Action Network in the Developing Brain