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Assessing Dyslexia at Six Year of Age
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Visually evoked potentials in boys with developmental dyslexia.

Klaus Hennighausen1, Helmut Remschmidt1, Andreas Warnke2

  • 1Department of Child and Adolescent Psychiatry, Philipps-University, Hans-Sachs-Straße 6, D-35033, Marburg, Germany.

European Child & Adolescent Psychiatry
|June 7, 2018
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Summary

Boys with developmental dyslexia often exhibit altered visual evoked potentials (VEPs). A specific VEP component was less common in dyslexic boys, particularly those with significant spelling deficits.

Keywords:
Pattern ReversalPilot StudyStandard DeviationStimulus OnsetWave Form

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Ophthalmology

Background:

  • Developmental dyslexia is a common neurodevelopmental disorder affecting reading acquisition.
  • Visual evoked potentials (VEPs) offer insights into visual pathway function.
  • Previous research suggests potential visual processing differences in dyslexia.

Purpose of the Study:

  • To investigate pattern reversal visually evoked potentials (VEPs) in boys with developmental dyslexia.
  • To identify electrophysiological differences between dyslexic individuals and controls.
  • To correlate VEP findings with spelling and intelligence scores.

Main Methods:

  • Visually evoked potentials (VEPs) were recorded using pattern reversal stimuli.
  • 16 boys with developmental dyslexia and 17 age-, sex-, and intelligence-matched controls participated.
  • Waveform analysis focused on differences between groups, particularly over the left central lead.

Main Results:

  • Significant waveform differences were observed between dyslexic boys and controls over the left central lead.
  • A specific negative VEP component (110-215 ms) was present in over 80% of controls but only 44% of dyslexic boys.
  • This VEP component deficit was most pronounced in dyslexic individuals with spelling deficits exceeding 1.5 standard deviations below their IQ.

Conclusions:

  • Boys with developmental dyslexia exhibit distinct pattern reversal visually evoked potential (VEP) characteristics.
  • The reduced prevalence of a specific VEP component may indicate underlying visual processing abnormalities in dyslexia.
  • These VEP findings correlate with the severity of spelling impairments in dyslexic boys.