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.
Lucchelli
F
F
Neurological Department, Modena University, Italy.
De Renzi
E
E
D000328:Adult; D001037:Aphasia / Q000175:diagnosis / Q000503:physiopathology*; D001925:Brain Damage, Chronic / Q000175:diagnosis / Q000503:physiopathology; D002528:Cerebellar Neoplasms / Q000503:physiopathology / Q000601:surgery; D002544:Cerebral Infarction / Q000175:diagnosis / Q000503:physiopathology*; D004292:Dominance, Cerebral / Q000502:physiology*; D005625:Frontal Lobe / Q000503:physiopathology*; D005910:Glioma / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008433:Mathematics; D009483:Neuropsychological Tests; D011183:Postoperative Complications / Q000175:diagnosis / Q000503:physiopathology; D011340:Problem Solving / Q000502:physiology