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Aphasia in a prelingually deaf woman
Brain : a Journal of Neurology
|March 1, 1982
Summary
A stroke in a deaf individual caused aphasia affecting both American Sign Language (ASL) and written English. This suggests language processing deficits are not modality-dependent, impacting all linguistic systems.
Area of Science:
- Neuroscience
- Linguistics
- Neurolinguistics
Background:
- Investigating the neural basis of language processing in deaf individuals.
- Examining modality independence of aphasic symptoms.
Observation:
- A prelingually deaf patient with a left parietal infarct developed aphasia for American Sign Language (ASL) and written English.
- The patient exhibited fluent but paraphasic signing, anomia, impaired comprehension, alexia, and agraphia, similar to hearing aphasics.
Findings:
- Aphasic symptoms in this case were not modality-specific, affecting both signed and written language.
- The patient demonstrated deficits in sequential movement copying, short-term verbal memory, and acalculia.
- Sign errors mirrored speech errors in oral aphasics, indicating shared linguistic disruption.
Implications:
- Aphasia reflects disruptions in universal linguistic processes, not modality-specific deficits.
- Confirms the left hemisphere's crucial role in processing sign language.
- Highlights the left supramarginal and angular gyri as essential for visual/gestural language comprehension.
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