Related Experiment Videos
[Pure agraphia. Apropos of 2 cases]
M Trillet1, B Croisile, B Laurent
1Service de Neurologie et de Neuropsychologie, Hôpital Neurologique, Lyon.
Revue Neurologique
|January 1, 1989
Summary
Pure agraphia, a writing disorder without other language deficits, is explored in two cases. Findings suggest pure agraphia is a heterogeneous condition, often linked to parietal lobe lesions.
Area of Science:
- Neuroscience
- Neurolinguistics
- Cognitive Psychology
Background:
- Pure agraphia, a selective impairment of writing without aphasia, alexia, or apraxia, has a debated existence.
- Historically, frontal lesions and confusional states were implicated in pure agraphia.
Observation:
- Two cases of pure agraphia resulting from left parietal hematomas are presented.
- Case 1: A deep precuneate lesion caused handwriting deficits and orthographic errors in copying and writing from dictation with both hands.
- Case 2: A lesion in the left angular gyrus resulted in letter selection and combination errors during dictation, with preserved handwriting and copying.
Findings:
- The study supports the heterogeneity of pure agraphia.
- Parietal lesions, encompassing superior or inferior, internal or external types, are increasingly implicated.
- The distinct error patterns in the two cases highlight variations in pure agraphia associated with specific lesion locations within the parietal lobe.
Implications:
- These findings contribute to a refined understanding of the neural substrates of written language production.
- The heterogeneity of pure agraphia necessitates careful lesion localization for accurate diagnosis and potential therapeutic strategies.
- Further research into the specific cognitive mechanisms underlying different forms of pure agraphia is warranted.