Neural Correlates of Inhibitory Control in Children: Evidence Using MRI and fNIRS

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomedical Engineering

Background:

• Inhibitory control (IC) is crucial for cognitive development, with its maturation occurring throughout childhood and adolescence.
• Dysfunctional IC is linked to various developmental disorders and impacts learning outcomes.
• Understanding the neural underpinnings of IC is essential for identifying developmental trajectories and potential interventions.

Purpose of the Study:

• To investigate the relationship between neural architecture, specifically myelination, and brain activation patterns during inhibitory control tasks in children.
• To explore how myelination in white matter regions of interest (ROIs) influences brain activity measured by functional near-infrared spectroscopy (fNIRS).
• To examine the association between myelination, brain activation, and behavioral performance on IC tasks.

Main Methods:

• Utilized reaction time measures during go/no-go and flanker tasks to assess inhibitory control (IC).
• Employed quantitative longitudinal relaxation rate (R1) mapping to measure myelination in selected white matter ROIs.
• Measured brain activation via functional near-infrared spectroscopy (fNIRS), assessing task-related changes in hemoglobin oxygenation within ROIs.

Main Results:

• Older children exhibited higher myelination levels in the studied ROIs.
• Frontal fNIRS activation positively correlated with go/no-go task reaction times.
• Myelination in the corona radiata and superior longitudinal fasciculus was positively associated with frontal fNIRS activation.
• Across white matter ROIs, increased myelination was negatively associated with both go/no-go and flanker task reaction times.

Conclusions:

• Myelination plays a significant role in the development of inhibitory control in children.
• Specific white matter tracts, like the corona radiata and superior longitudinal fasciculus, show distinct relationships between myelination, brain activation, and IC performance.
• These findings highlight the importance of white matter development for cognitive functions and suggest potential targets for future structure-function research in child development.