White matter microstructure in superior longitudinal fasciculus associated with spatial working memory performance in...

Area of Science:

• Neuroscience
• Developmental Psychology
• Neuroimaging

Background:

• White matter maturation in fronto-parietal regions continues through childhood and adolescence.
• Spatial working memory (SWM) skills develop significantly during childhood.
• The left fronto-parietal network is implicated in SWM processing.

Purpose of the Study:

• To investigate the association between white matter microstructure in the left fronto-parietal network and SWM performance in children.
• To explore the role of the superior longitudinal fasciculus (SLF) and related white matter tracts in SWM development.

Main Methods:

• Diffusion-weighted imaging was used to assess white matter microstructure in 76 typically developing children (ages 7-13).
• Fractional anisotropy (FA) was measured in the left fronto-parietal network, including the SLF, dorsolateral prefrontal cortex (pFC) white matter, and posterior parietal cortex.
• Statistical analyses examined the relationship between FA and SWM performance, controlling for age and other white matter measures.

Main Results:

• Higher FA in the left fronto-parietal network was significantly associated with better SWM performance, independent of age.
• This association was primarily driven by FA in the left SLF.
• Decreasing perpendicular diffusivity in the left SLF appeared to mediate the observed effect.

Conclusions:

• Individual differences in the microstructural integrity of the left fronto-parietal white matter network, particularly the SLF, are linked to SWM abilities in children.
• These findings suggest that variations in white matter architecture and development pace contribute to cognitive skill differences.
• Further research is needed to elucidate the interplay of intrinsic and experiential factors in shaping these neural connections.