Development of white matter microstructure in relation to verbal and visuospatial working memory-A longitudinal study

Area of Science:

• Neuroscience
• Developmental Psychology
• Biomedical Imaging

Background:

• Working memory is crucial for cognitive tasks and develops during childhood.
• Brain white matter microstructure maturation is essential for cognitive development.
• Limited understanding exists regarding the specific links between white matter development and working memory aspects.

Purpose of the Study:

• To investigate the relationship between changes in white matter microstructure and the development of working memory in children.
• To identify specific white matter tracts associated with improvements in visuospatial and verbal working memory.

Main Methods:

• Longitudinal study using Diffusion Tensor Imaging (DTI) on 148 healthy children (4-11 years old).
• Scans were conducted twice with an average interval of 1.6 years.
• Analyzed changes in fractional anisotropy (FA), mean diffusivity (MD), radial diffusivity (RD), and axial diffusivity (AD) in 10 major white matter tracts.

Main Results:

• Improvements in visuospatial working memory were associated with decreased MD, RD, and AD in the right hemisphere's inferior longitudinal fasciculus (ILF), inferior fronto-occipital fasciculus (IFOF), uncinate fasciculus (UF), and forceps major (FMaj).
• No significant associations were found between DTI metric changes and improvements in verbal working memory capacity.

Conclusions:

• White matter microstructure development, particularly in specific right-hemisphere tracts, is linked to visuospatial working memory enhancement in children.
• These findings contribute to understanding the neural underpinnings of working memory development.