STROOP INTERFERENCE - AGING EFFECTS ASSESSED WITH THE STROOP COLOR-WORD TEST

A large, cross-sectional aging investigation of performance on the Str oop Color-Word Test (SCWT) was carried out. Subjects were 247 voluntee rs, ages 20-80 in seven age levels. Although all subjects thought them selves to be normal and healthy, a post hoc division could be made on the basis of biological life events (BLE). BLE are mild biological or environmental factors, such as repeated experiences of general anesthe sia, that can hamper optimal brain functioning. Apart from the anticip ated age effects, performance was poorer in subjects who had experienc ed one or more BLE: The slowing due to BLE was comparable to the effec t of age, especially on the task involving language interference in co lor-naming. Education had a significant effect on performance: More hi ghly educated subjects performed better than less educated subjects. N o sex differences were observed. These findings replicate observations made with other tests in parallel studies. They are also in line with several other studies reporting interactions between the effects of a ging and physical fitness. This study questions some of the validity o f cognitive aging research, as our data suggest that screening for BLE as age-extrinsic factors in nondiseased subjects can reduce many of t he performance deficits usually ascribed to aging per se.