Developmental dyslexia: Passive visual stimulation provides no evidence for a magnocellular processing defect

Sönke Johannes, Clifton L. Kussmaul, Thomas F. Münte, George R Mangun

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Livingstone et al. presented evidence for a defect of the magnocellular visual processing stream in developmental dyslexia. They reported diminished visual evoked potentials (VEP) to low-contrast, rapid checkerboard reversal patterns in the dyslexics. We attempted to replicate this effect using transient and steady-state VEPs to checkerboard reversal stimuli in a group of adult developmental dyslexics. Several different reversal rates and contrast levels were utilized. No differences were found between the dyslexic and control groups for the low-contrast, rapidly reversing patterns, nor for any combination of stimulus rate or contrast that was tested. Thus, these findings do not support a magnocellular processing deficit in developmental dyslexia.

Original languageEnglish (US)
Pages (from-to)1123-1127
Number of pages5
Issue number11
StatePublished - Nov 1996



  • Developmental dyslexia
  • Human
  • Magnocellular pathway
  • Visual evoked potentials (VEP)

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Neuropsychology and Physiological Psychology

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