Abstract
Abstract We present a patient with selective dyscalculia following left-hemisphere damage. GC was a cognitively unimpaired woman except for mild verbal and spatial learning disorders. Within the domain of cognitive numerical processing 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 between preserved language and impaired mathematical skills is more marked. GC also committed many misspellings in writing number names, but only a few errors in writing words. This dissociation supports the hypothesis of categorical organization to a very peripheral level of language processing.
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