The Role of Fronto-Parietal and Fronto-Striatal Networks in the Development of Working Memory: A Longitudinal Study

Cereb Cortex. 2015 Jun;25(6):1587-95. doi: 10.1093/cercor/bht352. Epub 2014 Jan 9.

Abstract

The increase in working memory (WM) capacity is an important part of cognitive development during childhood and adolescence. Cross-sectional analyses have associated this development with higher activity, thinner cortex, and white matter maturation in fronto-parietal networks. However, there is still a lack of longitudinal data showing the dynamics of this development and the role of subcortical structures. We included 89 individuals, aged 6-25 years, who were scanned 1-3 times at 2-year intervals. Functional magnetic resonance imaging (fMRI) was used to identify activated areas in superior frontal, intraparietal cortices, and caudate nucleus during performance on a visuo-spatial WM task. Probabilistic tractography determined the anatomical pathways between these regions. In the cross-sectional analysis, WM capacity correlated with activity in frontal and parietal regions, cortical thickness in parietal cortex, and white matter structure [both fractional anisotropy (FA) and white matter volume] of fronto-parietal and fronto-striatal tracts. However, in the longitudinal analysis, FA in white matter tracts and activity in caudate predicted future WM capacity. The results show a dynamic of neural networks underlying WM development in which cortical activity and structure relate to current capacity, while white matter tracts and caudate activity predict future WM capacity.

Keywords: DTI; caudate nucleus; cortical thickness; development; fMRI; working memory.

MeSH terms

  • Adolescent
  • Adult
  • Child
  • Corpus Striatum / blood supply
  • Corpus Striatum / growth & development*
  • Diffusion Magnetic Resonance Imaging
  • Female
  • Frontal Lobe / blood supply
  • Frontal Lobe / growth & development*
  • Humans
  • Longitudinal Studies
  • Magnetic Resonance Imaging
  • Male
  • Memory, Short-Term / physiology*
  • Neural Pathways / blood supply
  • Neural Pathways / growth & development*
  • Neuropsychological Tests
  • Oxygen / blood
  • Parietal Lobe / blood supply
  • Parietal Lobe / growth & development*
  • Statistics as Topic
  • Young Adult

Substances

  • Oxygen