[Asymmetry in internal capsule detected with magnetic diffusion tensor imaging]

Area of Science:

• Neuroimaging
• Neuroanatomy
• Diffusion Tensor Imaging (DTI)

Context:

• The posterior limb of the internal capsule is a critical white matter tract.
• Understanding white matter asymmetries is crucial for neuroscientific research.
• Diffusion Tensor Imaging (DTI) allows for in vivo investigation of white matter microstructure.

Purpose:

• To investigate potential fiber asymmetry in the posterior limb of the internal capsule using DTI.
• To compare diffusion parameters between the left and right hemispheres in right-handed and left-handed individuals.

Summary:

• DTI parameters including fractional anisotropy (FA), apparent diffusion coefficient (ADC), and eigenvalues (lambda1, lambda2, lambda3) were measured in the posterior limb of the internal capsule.
• In right-handers, significantly higher FA was observed in the left hemisphere compared to the right (P=0.001), with lower lambda2 and lambda3 values (P=0.016, P=0.024).
• No significant hemispheric differences in any DTI parameters were found in left-handers.

Impact:

• Findings suggest potential differences in myelination or fiber organization in the posterior limb of the internal capsule between hemispheres in right-handers.
• The study highlights hemispheric asymmetry in white matter microstructure and its potential link to handedness.
• These results contribute to the understanding of neuroanatomical variations and their relationship with cognitive functions.