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Reading with one hemisphere.

K Patterson1, F Vargha-Khadem, C E Polkey

  • 1MRC Applied Psychology Unit, Cambridge, UK.

Brain : a Journal of Neurology
|February 1, 1989
PubMed
Summary
This summary is machine-generated.

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This study on hemispherectomy patients reveals the right hemisphere can support reading skills, while left hemisphere removal severely impairs reading, mimicking deep dyslexia. This highlights the left hemisphere's crucial role in reading.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurolinguistics

Background:

  • Investigating the roles of cerebral hemispheres in complex cognitive functions.
  • Examining reading abilities in individuals following complete hemispherectomy for intractable epilepsy.
  • Assessing pre-existing language and reading capacities before surgical intervention.

Observation:

  • Two right-handed adolescent females underwent complete hemispherectomy (one left, one right) for epilepsy.
  • Both subjects possessed normal language and reading skills prior to their illness.
  • Post-surgery, the patient with right hemisphere removal (H.P.) showed preserved reading subskills.
  • The patient with left hemisphere removal (N.I.) exhibited significant reading deficits.

Findings:

Related Experiment Videos

  • Reading performance in H.P. (right hemispherectomy) was largely intact across all subcomponents, though less advanced than typical peers.
  • N.I.'s (left hemispherectomy) reading impairment pattern closely resembled adult deep dyslexia and split-brain patient deficits.
  • Specific reading subskills were differentially affected by the removal of either hemisphere.

    • Implications:

    • Suggests the left hemisphere is critical for normal reading acquisition and function.
    • Demonstrates the right hemisphere's potential capacity to support reading, albeit with limitations.
    • Provides insights into hemispheric contributions to reading and potential for cross-hemispheric plasticity.