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Intrahemispheric disconnection

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Intrahemispheric disconnection arises from lesions in the subcortical white matter linking parts of the same hemisphere.

Presentations:

  • conduction aphasia - due to lesion of the arcuate fasciculus linking Wernicke's and Broca's speech areas. Characterised by fluent dysphagic speech, good comprehension of written and spoken material, poor repetition.
  • pure word deafness - due to disconnection between the primary auditory cortex and auditory association areas. Characterised by impaired comprehension of speech. Self-initiated language is normal. Audiometry is normal despite the patient feeling deaf.
  • buccal, lingual and 'sympathetic' apraxia - due to disconnection between association motor cortices in the subcortical region. Characterised by right brachiofacial weakness, apraxia of tongue, lip and left limb movements.

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