Brain activation on pre-reading tasks reveals at-risk status for dyslexia in 6-year-old children: Health and Disability

Karsten Specht, Kenneth Hugdahl, Sonja Ofte, Merethe NygÅrd, Atle BjØrnerud, Elena Plante, Turid Helland

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

In this fMRI-study, 6-year-old children considered at risk for dyslexia were compared with an age-/gender-matched control group for differences in brain activation when presented with visual stimuli differing in demands for literacy processing. Stimuli were nameable pictures, brand logos familiar to children, and written words - these were either regularly spelled using early-acquired rules ("alphabetic") or more complex ("orthographic"). Brain responses distinguished between the presentation conditions, as a function of group, within many cortical areas. Activation in the alphabetic and orthographic conditions in the left angular gyrus correlated with individual at-risk index scores, and activation in inferior occipito-temporal regions further indicated differential activation for the two groups related to orthographic processing, especially. Since similar patterns are reported in adult dyslexics when processing written words, it appears that sensitivity to the cortical differentiation of reading networks is established prior to formal literacy training.

Original languageEnglish (US)
Pages (from-to)79-91
Number of pages13
JournalScandinavian Journal of Psychology
Volume50
Issue number1
DOIs
StatePublished - Feb 1 2009

Keywords

  • At-risk
  • Brain
  • Dyslexia
  • FMRI
  • Language disorders
  • Reading acquisition

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)
  • Psychology(all)

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