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Screen Time Is Associated with Altered Neural Maturation in a Massive Adolescent Cohort
Alexander S Atalay1, Benjamin T Newman1, T Jason Druzgal1
1Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA 22903, USA.
Children (Basel, Switzerland)
|July 28, 2026
Summary
Increased screen time in adolescents is linked to altered brain development, potentially accelerating reward pathways and decelerating cognitive control systems. This highlights complex neurological changes beyond traditional measures.
Area of Science:
- Neuroscience
- Adolescent Development
- Brain Imaging
Background:
- Growing evidence links adolescent screen time to psychological issues.
- Neurological basis of this relationship remains largely unexplored.
Purpose of the Study:
- Investigate the neurological underpinnings of screen time effects on adolescent brain development.
- Examine changes in brain microstructure related to screen use.
Main Methods:
- Longitudinal study using brain MRI scans from the Adolescent Brain Cognitive Development (ABCD) Study.
- Assessed gray matter density and diffusion microstructure in 13 key brain regions.
- Analyzed changes in axonal and intracellular signaling.
Main Results:
- Positive correlation between screen time and axonal signaling in 6 regions.
- Decreased intracellular signaling in 8 regions, mainly in cognitive control areas.
- Screen time may accelerate reward system development and decelerate cognitive control development.
Conclusions:
- Adolescent screen time has complex associations with brain tissue microstructure.
- Traditional measures like GMD and fractional anisotropy do not fully capture these changes.
