title: Does the left inferior parietal lobule contribute to multiplication facts?
abstract: We report a single case, who presents with a selective and severe impairment for multiplication and division facts. His ability to retrieve subtraction and addition facts was entirely normal. His brain lesion affected the left superior temporal and to lesser extent in the left middle temporal gyri and the left precentral gyrus extending inferiorly to the pars opercularis of the left frontal lobe. Interestingly, the left supramarginal and angular gyri (SMG/AG) were spared. This finding realised a double dissociation with a previously reported patient, who despite lesions in the SMG/AG did not have a multiplication impairment (van Harskamp et al., 2002). The previously suggested crucial role of the SMG/AG in the retrieval of simple multiplication facts is therefore poorly supported (Cohen et al., 2000; Lee, 2000).
authors.affiliation: Department of Neuropsychology, National Hospital for Neurology and Neurosurgery, London, UK. n.harskamp@ion.ucl.ac.uk
authors.forename: Natasja J
authors.initials: NJ
authors.lastname: van Harskamp
authors.forename: Peter
authors.initials: P
authors.lastname: Rudge
authors.forename: Lisa
authors.initials: L
authors.lastname: Cipolotti
mesh_terms: D000328:Adult; D001930:Brain Injuries / Q000473:pathology / Q000523:psychology; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008433:Mathematics; D008606:Mental Processes / Q000502:physiology*; D009460:Neurologic Examination; D009483:Neuropsychological Tests; D010296:Parietal Lobe / Q000473:pathology / Q000502:physiology*; D011932:Reading