Y. Lampl et al., SELECTIVE ACALCULIA WITH SPARING OF THE SUBTRACTION PROCESS IN A PATIENT WITH LEFT PARIETOTEMPORAL HEMORRHAGE, Neurology, 44(9), 1994, pp. 1759-1761
We describe a patient with left parietotemporal hemorrhage with select
ive acalculia for addition, multiplication, and division, lout with an
intact ability to subtract. There was no impairment in the ability to
distinguish mathematical signs. This case suggests that different pro
cessing systems are responsible for each of the basic arithmetic opera
tions.