Early fluid intelligence linked to faster gray matter refinement
A large longitudinal study reveals that early childhood intelligence scores can predict the pace at which gray and white matter develop during adolescence, highlighting distinct patterns of brain refinement and network specialization.
A substantial study published in Developmental Cognitive Neuroscience has uncovered that higher early childhood intelligence predicts accelerated brain development during adolescence. Researchers from King’s College London discovered that children with superior fluid intelligence demonstrated faster gray matter shrinkage and a more gradual maturation of white matter pathways compared to their peers.
The study, which involved 10,495 participants from the ongoing Adolescent Brain Cognitive Development project, tracked cognitive ability and brain changes over a four-year period. Fluid intelligence, which encompasses problem-solving, memory, and processing speed, correlated with a quicker decrease in gray matter volume and surface area, particularly in the frontal lobe.
In contrast, higher scores in crystallized cognition and matrix reasoning were linked to a slower, more prolonged increase in white matter integrity. These findings suggest that intellectually gifted adolescents undergo an accelerated phase of neural refinement, as indicated by structural brain changes. Meanwhile, baseline cognitive scores also influenced resting-state functional connectivity, with higher intelligence correlating with a faster decrease in connectivity between certain brain networks.
The study adjusted for factors such as socioeconomic status, sex, and variations in MRI equipment to ensure accurate results.
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