Search tips
Search criteria 


Logo of jnnpsycJournal of Neurology, Neurosurgery and PsychiatryVisit this articleSubmit a manuscriptReceive email alertsContact usBMJ
J Neurol Neurosurg Psychiatry. 1993 March; 56(3): 304–307.
PMCID: PMC1014868

Primary dyscalculia after a medial frontal lesion of the left hemisphere.


A patient had an infarct in the territory of the left anterior cerebral artery, which destroyed the medial cortex of the frontal lobe, and presented with a picture of primary dyscalculia. Lexical and syntactic processing of verbal and arabic numbers and comprehension of operation symbols were intact, but retrieval of basic, over-learned facts was mildly impaired and execution of calculation procedures was more severely impaired. As the same type of procedure could be passed or sometimes failed it suggests a deficit of activation of the appropriate procedures. The location of the lesion was unusual and suggested participation of medial frontal areas in calculation processes.

Full text

Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (984K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References.

Images in this article

Click on the image to see a larger version.

Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Boller F, Grafman J. Acalculia: historical development and current significance. Brain Cogn. 1983 Jul;2(3):205–223. [PubMed]
  • HECAEN H, ANGELERGUES R, HOUILLIER S. [The clinical varieties of acalculias during retrorolandic lesions: statistical approach to the problem]. Rev Neurol (Paris) 1961 Aug;105:85–103. [PubMed]
  • McCloskey M, Caramazza A, Basili A. Cognitive mechanisms in number processing and calculation: evidence from dyscalculia. Brain Cogn. 1985 Apr;4(2):171–196. [PubMed]
  • McCloskey M, Sokol SM, Goodman RA. Cognitive processes in verbal-number production: inferences from the performance of brain-damaged subjects. J Exp Psychol Gen. 1986 Dec;115(4):307–330. [PubMed]
  • Warrington EK. The fractionation of arithmetical skills: a single case study. Q J Exp Psychol A. 1982 Feb;34(Pt 1):31–51. [PubMed]
  • Sokol SM, McCloskey M, Cohen NJ, Aliminosa D. Cognitive representations and processes in arithmetic: inferences from the performance of brain-damaged subjects. J Exp Psychol Learn Mem Cogn. 1991 May;17(3):355–376. [PubMed]
  • Bogousslavsky J, Assal G, Regli F. Infarctus du territoire de l'artère cérébrale antérieure gauche. II. Troubles du langage. Rev Neurol (Paris) 1987;143(2):121–127. [PubMed]
  • Bogousslavsky J, Regli F. Anterior cerebral artery territory infarction in the Lausanne Stroke Registry. Clinical and etiologic patterns. Arch Neurol. 1990 Feb;47(2):144–150. [PubMed]

Articles from Journal of Neurology, Neurosurgery, and Psychiatry are provided here courtesy of BMJ Group