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Developmental phonological and lexical agraphia in adults
1Department of Neurology, School of Medicine, University of Missouri-Columbia.
Brain and Language
|November 1, 1988
Summary
Developmental agraphia (DA) in adults can be categorized into phonological and lexical subtypes, mirroring acquired agraphia. This supports a two-system model for spelling impairments.
Area of Science:
- Neuroscience
- Linguistics
- Developmental Psychology
Background:
- Acquired agraphia, resulting from brain lesions, often presents as phonological or lexical, indicating distinct spelling systems.
- Developmental agraphia (DA) in children has shown spelling patterns similar to acquired forms, suggesting shared underlying mechanisms.
Purpose of the Study:
- To investigate whether developmental agraphia in adolescents and adults can also be classified into phonological and lexical subtypes.
- To compare the spelling profiles of individuals with DA to those with acquired agraphia (AA) and control subjects.
Main Methods:
- Spelling abilities of 22 adolescent and adult subjects with DA were analyzed.
- These results were compared with data from control groups and individuals with acquired agraphia.
Main Results:
- Subjects with DA were divisible into two distinct groups based on their spelling abilities.
- The spelling profiles of these DA groups closely resembled those of the phonological and lexical AA groups.
Conclusions:
- Developmental agraphia in adults can be reliably divided into phonological and lexical subtypes.
- These findings provide further support for a two-system hypothesis underlying linguistic agraphia, applicable to both acquired and developmental forms.