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Related Experiment Videos

"Semantic" conduction aphasia from a posterior insular cortex infarction

R S Marshall1, R M Lazar, J P Mohr

  • 1Department of Neurology, Columbia-Presbyterian Medical Center, New York, NY 10032, USA.

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|July 1, 1996
PubMed
Summary

A specific brain infarction caused a unique form of conduction aphasia with frequent semantic errors. This suggests cortical diaschisis may contribute to this language disorder.

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Science

Background:

  • Conduction aphasia is a language disorder typically associated with damage to the arcuate fasciculus.
  • Semantic paraphasias, or the substitution of words with related meanings, are common in various aphasia subtypes.

Observation:

  • A unique cerebral infarction was identified, specifically affecting the posterior insula and intrasylvian parietal opercular cortex.
  • Patients with this lesion exhibited a distinct subtype of conduction aphasia.

Findings:

  • The observed conduction aphasia subtype was characterized by a significant predominance of semantic paraphasias.
  • Hexamethylpropyleneamineoxime single-photon emission computed tomography revealed temporal lobe hypoperfusion without signs of ischemia.
  • This pattern suggests that cortical diaschisis, a remote functional depression, may be implicated in the aphasia syndrome.

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Implications:

  • This study expands the understanding of the neural correlates of conduction aphasia.
  • It highlights the role of specific cortical regions and diaschisis in language processing deficits.
  • Findings contribute to the neuroanatomical localization of semantic paraphasias.