Review of agraphia and a proposal for an anatomically-based neuropsychological model of writing

Abstract

AbstractPrevious models of agraphia have been descriptive and have emphasized the association of agraphia with other disorders such as aphasia and alexia. Such models have frequently led to inconsistent descriptions of specific agraphia types. These inconsistencies have made clinical-anatomical correlations difficult. Recent studies of agraphic patients with focal cerebral lesions have made it possible to develop a new model of writing based on specific neuropsychological mechanisms. In addition, results from computerized tomography have helped delineate probable anatomic substrates for many of these mechanisms. It is hoped this model provides a means for a better understanding of the mechanisms and anatomy underlying the agraphias as well as a better understanding of the relationships of the agraphias with aphasia and alexia.