Abstract: A comparative study on the characters of six cognitive performances inaging was accomplished by using the method of man-computer interaction in 506subjects of 46 to 75 years old. The results indicated: 1) The performancespeeds in arithmetic and symble-digit tasks slowed rapidly with increased age,but the test records inl both the tasks declined slowly in aging. Thus, thechanges of performance speed was the major character in arithmetic and symble-digit tasks in aging. 2) The performance speeds in digit discrimination andcount tasks slowed slowly with age. 3) The test records in sequence re-membering of two digit and recognition of meaningless figure tasks declinedrapidly with age, but the former was more obvious than the latter. 4) Theindividul differences in performance speed and test record tended to increasein aging.

Key words: cognitive performance speed, cognitive performance record, individual differences, aging