Sex differences in adolescent white matter architecture.

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Neuroimaging

Background:

• Adolescent white matter development exhibits sex-specific trajectories, potentially explaining cognitive and behavioral differences between males and females.
• Understanding these sex differences in typically developing adolescents is crucial for interpreting sexual dimorphisms in abilities and actions.

Purpose of the Study:

• To investigate sex differences in white matter microstructure in early adolescence.
• To examine the relationship between these microstructural differences and pubertal development.

Main Methods:

• Diffusion tensor imaging (DTI) was used to examine 58 healthy adolescents aged 12-14 years.
• Diffusion parameters including fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (AD) were analyzed using tract-based spatial statistics.
• Whole-brain voxel-wise comparisons were performed to identify sex differences.

Main Results:

• Females exhibited higher FA in the superior corona radiata and bilateral corticospinal tracts, and lower MD in the inferior longitudinal fasciculus and forceps major compared to males.
• Males showed higher AD in the superior longitudinal fasciculus, inferior longitudinal fasciculus, and forceps minor.
• No significant influence of pubertal stage on observed sex disparities in white matter microstructure was found.

Conclusions:

• In early adolescence, females may experience widespread changes in motor tracts.
• Males might undergo more significant microstructural changes in projection and association fibers.
• These findings highlight distinct patterns of brain maturation between sexes during adolescence.