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Bimanual coordination in dyslexic adults

L H Moore1, W S Brown, T E Markee

  • 1Travis Institute of Biopsychosocial Research, Fuller Graduate School of Psychology, Pasadena, CA 91101, USA.

Neuropsychologia
|June 1, 1995
PubMed
Summary

Adults with dyslexia exhibit significant deficits in bimanual motor coordination and interhemispheric communication, impacting tactile-motor skills. These findings highlight neurological differences in dyslexic individuals affecting coordinated movements.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Motor Control

Background:

  • Dyslexia is often linked to difficulties in tactile-motor coordination and interhemispheric information transfer.
  • Understanding these deficits is crucial for developing targeted interventions for individuals with dyslexia.

Purpose of the Study:

  • To investigate bimanual motor coordination and interhemispheric collaboration in adults with dyslexia.
  • To compare the performance of dyslexic adults to neurotypical controls on a tactile-motor coordination task.

Main Methods:

  • Utilized the Bimanual Coordination Task to assess tactile-motor coordination and interhemispheric function.
  • Compared 21 adults with dyslexia to 21 age- and education-matched control subjects.
  • Evaluated performance with and without visual feedback during bimanual movements.

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Main Results:

  • Dyslexic adults demonstrated consistent deficits in bimanual motor coordination compared to controls.
  • Difficulties were pronounced when requiring faster left-hand movements or opposite hand motions, indicating interhemispheric modulation issues.
  • Performance correlated with visuospatial skills (Block Design) but not phonological processing (rhyme fluency).

Conclusions:

  • Adult dyslexia is associated with impaired bimanual motor coordination and interhemispheric visuomotor control.
  • Visuospatial abilities, potentially right-hemisphere mediated, may play a role in bimanual coordination for dyslexic individuals.
  • These findings suggest a broader neurological profile for dyslexia extending beyond phonological processing deficits.