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White matter associations with spelling performance.

Romi Sagi1, J S H Taylor2, Kyriaki Neophytou3,4

  • 1The Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel. sagiromi@gmail.com.

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|March 26, 2024
PubMed
Summary

This study reveals distinct brain pathway differences in spelling. High-performing spellers use ventral pathways, while low-performing spellers utilize dorsal pathways, indicating varied cognitive strategies for word production.

Keywords:
DTIDiffusion MRIProbabilistic tractographySpellingWhite matterWritten word production

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Written word production involves complex neurocognitive processes.
  • Neural pathways supporting spelling in healthy adults are not well understood.
  • Individual differences in spelling ability may relate to distinct neural substrates.

Purpose of the Study:

  • To investigate the association between white matter microstructure and spelling performance.
  • To identify specific language-related white matter tracts involved in spelling.
  • To explore differences in cognitive strategies between high- and low-performing spellers.

Main Methods:

  • Diffusion magnetic resonance imaging (dMRI) was used to assess white matter integrity.
  • Constrained spherical deconvolution and probabilistic tractography reconstructed white matter pathways.
  • Participants completed a spelling-to-dictation task and cognitive assessments.

Main Results:

  • Spelling performance correlated with microstructural properties in both dorsal and ventral white matter pathways.
  • High-performing spellers showed associations with the left inferior longitudinal fasciculus (ventral stream).
  • Low-performing spellers showed associations with the right superior longitudinal fasciculus (dorsal pathway).

Conclusions:

  • Distinct white matter pathways are associated with different levels of spelling proficiency.
  • High-performing spellers may rely more on lexical-orthographic representations.
  • Low-performing spellers may rely more on phoneme-to-grapheme conversion, suggesting different cognitive strategies.