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Selective impairment of the graphemic buffer in acquired dysgraphia: a case study
L Posteraro1, P Zinelli, A Mazzucchi
1Clinica Neurologica, Università di Parma, Italy.
Brain and Language
|November 1, 1988
Summary
This study reports on an Italian patient with severe spelling deficits affecting both written and oral language. Findings suggest damage to the graphemic buffer, impacting spelling accuracy and word length processing.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Linguistics
Background:
- Investigating the neural and cognitive underpinnings of spelling and writing processes.
- Understanding the functional architecture of language production and its disorders.
- Examining the role of the graphemic buffer in written language.
Observation:
- A case study of an Italian patient (S.E.) with profound deficits in written and oral spelling.
- Performance was consistent across various writing tasks: dictation, delayed copying, and naming.
- Errors primarily involved single-letter deletions, particularly in medial word positions.
Findings:
- Patient's performance was significantly affected by stimulus length, with longer words yielding more errors.
- The observed pattern of deficits aligns with the hypothesis of selective damage to the graphemic buffer.
- No significant difference was noted between performance on real words and nonwords.
Implications:
- Provides evidence for the distinct role of the graphemic buffer in spelling and writing.
- Contributes to refining functional models of written language production.
- Highlights the impact of specific neurological damage on complex cognitive functions like spelling.