Table 2.
The cognitive performance for the Stroop and word-reading test in young and elderly subjects
| Trial | Stroop test | Word-reading test | Stroop interference time (s) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n | Total time period (s) | 100/total time period (answers/s) | Number of errors | n | Total time period (s) | 100/total time period (answers/s) | Number of errors | ||
| Young subjects | |||||||||
| Tr 1 | 9 | 64.2 ± 4.8# | 1.6 ± 0.1# | 1.7 ± 0.7# | 9 | 47.4 ± 2.0 | 2.1 ± 0.1 | 0 | 16.9 ± 3.0 |
| Tr 2 | 9 | 62.7 ± 3.8# | 1.6 ± 0.1# | 1.4 ± 0.6# | 9 | 45.9 ± 1.4 | 2.2 ± 0.1 | 0 | 16.8 ± 2.8 |
| Tr 3 | 9 | 61.8 ± 3.5# | 1.7 ± 0.1# | 2.0 ± 0.9# | 9 | 46.1 ± 1.1 | 2.2 ± 0.1 | 0 | 15.6 ± 2.6 |
| Tr 4 | 8 | 64.7 ± 4.2# | 1.6 ± 0.1# | 1.6 ± 0.5# | 7 | 45.3 ± 0.7 | 2.2 ± 0.0 | 0.1 ± 0.1 | 19.2 ± 4.5 |
| Elderly subjects | |||||||||
| Tr 1 | 9 | 94.6 ± 4.9†,# | 1.1 ± 0.1†,# | 3.2 ± 0.6†,# | 9 | 63.2 ± 2.8† | 1.6 ± 0.1† | 0.1 ± 0.1 | 31.4 ± 3.2† |
| Tr 2 | 9 | 90.7 ± 4.4†,# | 1.1 ± 0.1†,# | 3.0 ± 0.9†,# | 9 | 59.6 ± 3.3† | 1.7 ± 0.1† | 0.1 ± 0.1 | 31.1 ± 2.3† |
| Tr 3 | 9 | 89.6 ± 4.4†,# | 1.1 ± 0.1†,# | 4.1 ± 0.9†,# | 9 | 58.2 ± 2.5† | 1.7 ± 0.1† | 0 | 31.4 ± 3.3† |
| Tr 4 | 9 | 84.2 ± 3.8†,# | 1.2 ± 0.1†,# | 2.2 ± 0.7†,# | 6 | 61.6 ± 4.5† | 1.7 ± 0.1† | 0.6 ± 0.4 | 26.8 ± 3.1† |
Values are mean ± SE. A difference in total periods between the Stroop and word-reading tests is considered as an interference period (Stroop interference time = total period for Stroop − total period for word-reading). n number of subjects
†Significant difference (P < 0.05 by three-way ANOVA with a Dunnett post hoc test) between young and elderly subjects
#Significant difference (P < 0.05 by three-way ANOVA with the Dunnett post hoc test) between the Stroop and word-reading tests