Talking Brains: Neonatal Aperiodic Activity in Resting State EEG Relates to Later Communicative Abilities

The study explores the relationship between neonatal aperiodic activity in resting-state EEG and later communicative abilities in typically developing infants. Communicative skills acquired within the first year of life are crucial for language development, and understanding the neural mechanisms behind these abilities could help predict later language outcomes and explain individual differences.

Researchers have primarily focused on oscillatory neural activity in past studies, but the aperiodic component of the neural signal, which indirectly reflects variation in neural excitation/inhibition (E/I) balance, may provide additional insights into cortical maturation, especially in neurodevelopmental conditions where reduced or elevated aperiodic activity is associated with atypical development.

In this research, aperiodic offset and exponent were derived from resting-state EEG recordings obtained two weeks after birth in 50 neonates using the FOOOF algorithm. At 12 months of age, communicative abilities were evaluated using the parent-report CSBS-DP Infant-Toddler Checklist. The findings revealed an inverted U-shaped relationship between neonatal aperiodic exponent and communicative abilities, indicating that both lower and higher exponent values were linked to poorer outcomes, with intermediate values corresponding to better abilities.

No significant association was observed for the offset. These results suggest that aperiodic activity during neonatal resting-state EEG can capture variability in early communicative development, with an optimal level occurring at intermediate values, indicative of a balanced E/I state. Consequently, the scope of aperiodic brain activity as a developmental marker may extend beyond clinical populations to predict communicative development in healthy infants.