Developmental process of the arcuate fasciculus from infancy to adolescence: a diffusion tensor imaging study

Area of Science:

• Neuroscience
• Developmental Biology
• Radiology

Background:

• The arcuate fasciculus (AF) is a crucial white matter tract connecting language processing regions.
• Understanding its developmental trajectory is essential for comprehending typical brain maturation.

Purpose of the Study:

• To investigate the radiologic developmental process of the arcuate fasciculus (AF) subcomponents.
• To analyze age-related changes, sex differences, and hemispheric asymmetry in AF development.

Main Methods:

• Diffusion tensor imaging (DTI) was used to analyze AF subcomponents in 96 typically developing children (0-14 years).
• Analysis success rate (AR) and fractional anisotropy (FA) values were measured for posterior, anterior, and direct AF tracts.
• Statistical analyses compared tract development across age groups and sexes.

Main Results:

• Analysis success rate (AR) increased with age for anterior and direct AF tracts.
• Fractional anisotropy (FA) values correlated with age for most AF subcomponents.
• Females showed higher AR and FA in early childhood (0-2 years); the direct AF tract exhibited increasing leftward asymmetry with age.

Conclusions:

• The arcuate fasciculus (AF) demonstrates a specific developmental sequence from infancy to adolescence.
• Sex differences are evident in early development, while leftward hemispheric asymmetry becomes more pronounced in older children.
• Subcomponent DTI analysis provides valuable insights into the neurodevelopmental patterns of the AF.