Abstract: The paper reported mental changes measured by Hasegawa's method in 189 patients with stroke, and analyzed the effects of lesion location and cerebral atrophy found by CT, and rCBF measured by SPECT on mental activities. In 69 of 189 patients, Hasegawa's Score was lower than 21. 5 points. It was found that up to 42. 9 % of the patients had dementia or predementia when stroke lesion was located in the left cerebral hemisphere, and only 23. 1% of the patients had dementia or predementia when the lesion was located in right hemisphere. The relationship between rCBF and Hasegawa's Score was analyzed. The authors found that, when lesion existed in the left cerebral hemisphere, there were very significantly positive relationships between Hasegawa's Score and rCBF in the left frontal lobe, the left temporal lobe and the left parietal lobe. The results indicated that the left cerebral hemisphere played a more important role in mental activities. Cerebral atrophy was also one of the factors influencing the intelligence of the patients.

Key words: Stroke, location of lesion, cerebral atrophy, rCBF, mental deterioration