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A dissociation between addition and subtraction with written calculation

Authors
Journal
Neuropsychologia
0028-3932
Publisher
Elsevier
Publication Date
Volume
32
Issue
6
Identifiers
DOI: 10.1016/0028-3932(94)90031-0
Disciplines
  • Mathematics

Abstract

Abstract A patient with a severe dyscalculia and a mild arabic number dyslexia is described. He could perform simple addition and subtraction sums with oral presentation. However with written arabic number sums he was impaired with addition but not with subtraction. These findings require modifications to current models of arithmetic processing which have suggested that numerical inputs are converted into abstract internal representations before arithmetical processing can occur.

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