Table 3. Performance measures for different experimental tasks, comparing young vs. old subjects.

Task Condition	Response Time (ms) Young	Response Time (ms) Old	Percent Correct Young	Percent Correct Old
Trail-Making Test (TMT)	1465 (±257)*	1938 (±444)*	—	—
Sustained Attention to Response Task (SART)	405 (±83)*	423 (±83)*	93.7 (±5.4)*	90.9 (±14.2)*
Verbal Working Memory Task (VWMT)	1074 (±137)*	1190 (±151)*	97.4 (±3.1)*	93.3 (±5.5)*

We report mean performance measures across subjects, ± standard deviation. A “*” indicates a significant difference between age groups, at p < 0.01, Wilcoxon rank-sum test. For VWMT, data were split into the 10 youngest and 10 oldest subjects; “Young” has a median age 41 (range 36 to 46) and “Old” has a median age 60 (range 55 to 71), a much smaller age difference. We performed significance testing on the difference between these two groups.