Abstract：
:Previous reports have demonstrated that many aspects of number knowledge remain unimpaired in semantic dementia, despite severe comprehension problems in other domains. It is argued that this advantage for numbers arises because the disease spares the parietal lobe magnitude system thought to be critical for number processing. Models of numerical cognition that favour a separation between verbal and magnitude representations of number might, however, predict a restricted impairment of the verbal number code in this condition. We obtained support for this hypothesis in a patient with late-stage semantic dementia. She was impaired at a variety of tasks tapping the verbal number code; for example, reading and writing Arabic numerals, naming and word-picture matching with dot pictures, reading aloud number words, digit span and magnitude comparison/serial ordering tasks with number words. In contrast, she demonstrated good understanding of the magnitude and serial order of numbers when tested with Arabic numerals and non-symbolic representations. These findings suggest that although the magnitude meaning of numbers is isolated from the temporal lobe semantic system, the anterior infero-temporal lobe may play a critical role in binding English number words to their non-symbolic magnitude meaning.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Jefferies E,Bateman D,Lambon Ralph MAdoi
10.1016/j.neuropsychologia.2004.09.009subject
Has Abstractpub_date
2005-01-01 00:00:00pages
887-905issue
6eissn
0028-3932issn
1873-3514pii
S0028-3932(04)00256-8journal_volume
43pub_type
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