... The subject of this paper is the peculiar symptom that I first described several years ago (1924)2 under the name of "finger agnosia." It manifests itself as an isolated disturbance in the recognition, naming, choosing, and differential exhibition of the various fingers of both hands—one's own fingers as well as those of another person. There is also a certain lack of freedom in the movements of individual fingers .... Furthermore, I will discuss the association that I noted between this symptom and a disturbance in rightleft orientation (in one's own as well as in another's body), agraphia and acalculia.3 And finally, I will relate the presence of this syndrome to focal lesions ... in the transitional area between the angular and second occipital convolution.
Since my first observation, ... I have established this syndrome with a considerable series of patients, in some of whom it existed as an independent
Gerstmann J. On the Symptomatology of Cerebral Lesions in the Transitional Area of the Lower Parietal and Middle Occipital Convolutions: (The Syndrome: Finger Agnosia, Right-Left Confusion, Agraphia and Acalculia). Arch Neurol. 1971;24(5):476. doi:10.1001/archneur.1971.00480350110013
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