A cognitive analysis of an acquired dysgraphic patient with an “allographic” writing disorder

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Abstract
This study reports the writing performance of an Italian dysgraphic patient who produces many “allographic” errors in his handwriting, which involve the apparently uncontrollable mixing of upper- and lower-case forms (e.g. “bolva” written as BolVA). We describe the patient's writing errors (which also include letter-form errors and the production of superimposed letters) and offer an interpretation of his impaired performance within a slightly modified version of a functional model of the processes underlying normal handwriting. We suggest that the patient has impaired selection of appropriate allographic forms of letters and has an additional deficit in the spatial control of the execution of his writing strokes.