Single letters are malformed or confused according to their graphic (e.g., M and W) rather than their phonetic similarity. This variety is consequent to the loss of graphic motor programs necessary for writing. Apraxic agraphia resembling pure agraphia has been described in terms of a modality-specific apraxia, but (ideomotor) apraxia is usually present in nonlanguage tasks. In Gerstmann's syndrome, elements of aphasic, spatial, and apraxic agraphia mingle. Lesions are found in the left parietal lobe, especially near the angular and supramarginal gyri.
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Christoph J. G. Lang University of Erlangen-Nuremberg, Erlangen, Germany
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