Article

Previous research has consistently shown that the left parietal cortex is
critical for numerical processing, but the role of the right parietal lobe has
been much less clear. This study used the intraoperative cortical electrical
stimulation approach to investigate neural dissociation in the right parietal
cortex for subtraction and multiplication. Results showed that multiplication (as
well as picture naming) was not affected by the cortical electrical stimulation
on all the targeted sites of the right parietal cortex as well as those of the
right temporal cortex. In contrast, stimulation at three right parietal sites
(two sites in the right inferior parietal lobule and one in the right angular
gyrus) impaired performance on simple subtraction problems. This study provided
the first evidence from an intraoperative cortical electrical stimulation study
to show the dissociation of arithmetic operations in the right parietal cortex.
This dissociation between subtraction and multiplication suggests that the right
parietal cortex plays a more significant role in quantity processing
(subtraction) than in verbal processing (multiplication) in numerical processing.
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Langue : ANGLAIS