Typical and Aberrant Functional Brain Flexibility: Lifespan Development and Aberrant Organization in Traumatic Brain...

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Cognitive Neuroscience

Background:

• Intrinsic functional connectivity networks show developmental trends linked to cognitive maturation.
• Previous studies utilized static connectivity measures, limiting insights into dynamic brain processes.

Purpose of the Study:

• To investigate dynamic functional connectivity (dFC) and dominant coupling modes in a large age range (8-60 years).
• To identify age-related developmental trends in neuronal population interactions.
• To assess the utility of dFC for age prediction and its relationship with neurodevelopmental and acquired brain conditions.

Main Methods:

• Utilized resting-state magnetoencephalography (MEG) data from 178 healthy participants.
• Employed a dynamic functional connectivity approach to analyze amplitude envelope, phase coupling, and phase-amplitude synchronization.
• Applied multi-class support vector machines for age classification and derived a composite flexibility index.

Main Results:

• Significant developmental trends were observed in three dominant interaction types across frontal, temporal, and parieto-occipital regions.
• Dynamic functional connectivity indices achieved 89% accuracy in classifying participants by chronological age.
• A composite flexibility index exhibited an inverse U-shaped curve in healthy individuals, with reduced flexibility in children with reading disabilities and adults with mild traumatic brain injury.

Conclusions:

• Dynamic functional connectivity provides sensitive markers of brain development and maturation.
• Altered brain flexibility may indicate atypical development or consequences of brain injury.
• Findings highlight the role of cross-frequency interactions in coordinating neuronal activity during development and in clinical populations.