Number transcoding and number word spelling in a left-brain-damaged non-aphasic acalculic patient

We present a patient with selective dyscalculia following left-hemisphere d amage, GC was a cognitively unimpaired woman except for mild verbal and spa tial learning disorders, Within the domain of cognitive numerical processin g mechanisms, GC presented with multiple and severe disorders, the two most important being impaired number transcoding and impaired arithmetical fact retrieval, Compared to previously reported cases, GC's dissociation betwee n preserved language and impaired mathematical skills is more marked. GC al so committed many misspellings in writing number names, but only a few erro rs in writing words. This dissociation supports the hypothesis of categoric al organization to a very peripheral level of language processing.