Primary dyscalculia after a medial frontal lesion of the left hemisphere. Issue 3 (March 1993)

• Record Type: Journal Article
• Authors: Lucchelli, F; De Renzi, E
• Is Part Of: Journal of neurology, neurosurgery and psychiatry. Volume 56:Issue 3(1993)
• Page Start: 304
• Page End: 307
• Publication Date: 1993-03
• Subjects: Neurology -- Periodicals; Nervous system -- Surgery -- Periodicals; Psychiatry -- Periodicals; 616.8
• DOI: 10.1136/jnnp.56.3.304
• Languages: English
• ISSNs: 0022-3050

Abstract

Abstract : 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.