Early Adversity Selectively Reshapes the Somato-Cognitive Action Network in the Developing Brain

Area of Science:

• Neuroscience
• Developmental Psychology
• Brain Imaging

Background:

• Early life adversity significantly impacts brain development.
• The specific effects of adversity on cortical network organization remain largely unknown.

Purpose of the Study:

• To investigate how early adversity remodels the areal layout of cortical brain networks in youth.
• To identify the dimensions along which these cortical networks are altered by adversity.

Main Methods:

• Longitudinal study of 4,525 youth (ages 9-18).
• Individualized cortical parcellations derived from neuroimaging data.
• Analysis of 15 cortical networks in relation to 10 dimensions of adversity.

Main Results:

• Exposure to threat, not deprivation or unpredictability, predicted dose-dependent expansion of the somato-cognitive action network (SCAN).
• SCAN expansion was associated with shifts in functional connectivity towards sensorimotor systems and away from control systems.
• SCAN expansion mediated the relationship between threat exposure and poorer cognitive function.

Conclusions:

• Adversity's impact on the developing cortex is not diffuse but converges on the SCAN.
• The SCAN's expansion in response to threat represents a significant neural mechanism linking early life stress to cognitive deficits.