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EEG Alpha Density Decreased in Children, Increased in Adults

Photoreal illustration of children and adults with overlay of EEG brain rhythms, conveying developmental differences in sleep effects on brain activity.

A 2026 eNeuro analysis of 163 people ages 3.5–24.7 found that wake EEG amplitude behaved like a sleep-pressure marker, but wake alpha-density changed in opposite directions across development: it decreased overnight in children and increased overnight in adolescents and adults.1 Research Highlights Alpha density flipped by age: In 163 participants ages 3.5–24.7, oscillation density showed …

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