White matter properties differ in 6-year old Readers and Pre-readers

Area of Science:

• Neuroscience
• Developmental Psychology
• Cognitive Science

Background:

• Reading is a fundamental skill acquired in childhood.
• Adult readers exhibit different white matter structures than non-readers.
• Similar differences in children learning to read are not well-established.

Purpose of the Study:

• To investigate white matter structural differences in 6-year-old children based on their reading ability.
• To explore the relationship between white matter integrity and foundational reading and language skills in early childhood.

Main Methods:

• Diffusion MRI and tractography were used to analyze white matter tracts.
• Fractional anisotropy (FA) was measured in six bilateral intra-hemispheric tracts and two corpus callosum subdivisions.
• Participants included 6-year-old readers (n=31) and pre-readers (n=11).

Main Results:

• Readers showed significantly higher FA in the left anterior superior longitudinal fasciculus (aSLF-L) and right uncinate fasciculus (UF-R) compared to pre-readers.
• FA in aSLF-L correlated with phonological awareness.
• FA in UF-R correlated with language skills, and this association remained significant after controlling for reading ability.

Conclusions:

• Individual differences in white matter structure are associated with the early stages of reading acquisition in children.
• The right uncinate fasciculus differences are linked to both language and reading abilities in young children.
• These findings highlight the neurobiological underpinnings of early reading development.