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Intellectual abilities and white matter microstructure in development: a diffusion tensor imaging study
Christian K Tamnes1, Ylva Østby, Kristine B Walhovd
1Department of Psychology, Center for the Study of Human Cognition, University of Oslo, Oslo, Norway. c.k.tamnes@psykologi.uio.no
Human Brain Mapping
|February 18, 2010
Summary
Intellectual abilities correlate with white matter (WM) development. Higher verbal skills are linked to accelerated WM maturation, suggesting early developmental plateaus in brain connectivity.
Area of Science:
- Neuroscience
- Cognitive Science
- Developmental Psychology
Background:
- Higher-order cognitive functions rely on interconnected brain networks.
- White matter (WM) development is a protracted process extending into adulthood.
- The relationship between cognitive abilities and WM microstructure maturation is not fully understood.
Purpose of the Study:
- To investigate the association between intellectual abilities and WM microstructure development.
- To explore how diffusion tensor imaging (DTI) measures relate to cognitive functions in a young cohort.
Main Methods:
- Cross-sectional study of 168 right-handed participants aged 8-30 years.
- Utilized diffusion tensor imaging (DTI) to derive WM microstructure measures.
- Analyzed associations between DTI indices (FA, MD, RD) and verbal/performance abilities.
Main Results:
- Verbal and performance abilities positively correlated with fractional anisotropy (FA) and negatively with mean diffusivity (MD) and radial diffusivity (RD), primarily in the left hemisphere.
- Verbal abilities showed associations with developmental differences in DTI indices across widespread regions.
- Specific tracts (anterior thalamic radiation, cortico-spinal tract, superior longitudinal fasciculus) showed significant relations with FA and RD.
Conclusions:
- Intellectual abilities are underpinned by WM microstructure development.
- High verbal abilities may be associated with accelerated WM maturation and earlier developmental plateau.
- Further longitudinal studies are needed to confirm these findings on brain connectivity and cognitive development.
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