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Sex Differences in White Matter Pathways Related to Language Ability.
Minyoung Jung1,2,3, Maria Mody4, Toru Fujioka5
1Department of Neuropsychiatry, University of Fukui, Eiheiji, Japan.
Sex differences in brain white matter (WM) pathways influence language ability. Males exhibit distinct WM structures compared to females, with varying correlations between WM metrics and verbal skills.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Neuroimaging
Background:
- Functional imaging suggests gender influences language ability.
- Neural basis of sex differences in language remains unclear, indicating complex interactions.
- White matter (WM) integrity is crucial for efficient neural communication in language processing.
Purpose of the Study:
- To investigate sex differences in white matter (WM) pathways using diffusion MRI.
- To explore the relationship between WM metrics and verbal abilities in males and females.
- To determine if sex modulates the association between WM integrity and language performance.
Main Methods:
- Diffusion weighted magnetic resonance imaging (dMRI) was employed.
- Global probabilistic tractography was used to analyze WM pathways.
- 32 males and 35 age- and IQ-matched females participated.
Main Results:
- Males showed higher fractional anisotropy (FA) in several WM tracts, including the left anterior thalamic radiations (ATR) and bilateral uncinate fasciculus (UNC).
- Females exhibited higher radial diffusivity (RD) in the left ATR and left UNC.
- Sex-specific correlations were observed between WM metrics (FA, AD, RD) and verbal abilities (VCI, VIQ).
Conclusions:
- Significant sex differences exist in the microstructural properties of WM pathways relevant to language.
- The relationship between WM integrity and verbal abilities differs between males and females.
- These findings highlight the complex interplay of sex, brain structure, and language processing.
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