Current Psychology

, Volume 1, Issue 3–4, pp 185–197 | Cite as

An intrahemispheric integration deficit in dyslexia

  • J. Graham Beaumont
  • Michael Thomson
  • Michael Rugg


In order to investigate the hypothesis that dyslexia may result from a failure of intrahemispheric integration between auditory-verbal and visual-verbal processing, a dichotic listening task and a parallel divided visual field task were administered to a group of dyslexic boys between the ages of 8 and 11 years, and a group of normal control subjects individually matched for age and WISC intelligence. The dyslexics were on average over two years retarded in reading and spelling. Dyslexics exhibited a normal right ear advantage on dichotic listening for digits although lesser right ear advantage was related to reading retardation. In the divided visual field task, the normal controls showed a left visual field advantage for digits which it is argued resulted from a failure in fixation linked to reading habits. Within the dyslexic group greater reading deficiency was associated with relative bilateralization for visual verbal processing. The results therefore support the hypothesis.


Visual Field Dyslexia Developmental Dyslexia Left Visual Field Asymmetry Index 
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Copyright information

© Springer 1981

Authors and Affiliations

  • J. Graham Beaumont
    • 1
  • Michael Thomson
    • 2
  • Michael Rugg
    • 3
  1. 1.Department of PsychologyUniversity of LeicesterLeicester
  2. 2.University of Aston in BirminghamUK
  3. 3.University of YorkUK

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