By studying mental arithmetic for healthy adults by statistical analysis and investigating the load of local areas, the study is better to learn how the brain works. Subjects are 22 right-handed healthy university males. Subjects were asked to do mental arithmetic twice independently. Numbers were selected during 1 to 10 randomly. Every two numbers were given respectively; the time interval of them is 3s or 2s. Subjects did additions for the given numbers. The research shows that each area of brain takes part in mental arithmetic, whereas the frontal, central and parietal of left hemisphere has more advantage than the right. What's more, the study proved when the working intensity was increased; we found decreased involvement of the right hemisphere specifically in males, who giving two right answers.
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